@article{hunt_tonelli_balik_2008, title={The effect of water and guest hydrophobicity on the complexation of oligomers with solid alpha-cyclodextrin}, volume={49}, ISSN={["0032-3861"]}, DOI={10.1016/j.polymer.2008.01.007}, abstractNote={α-Cyclodextrin (α-CD), a cyclic oligosaccharide, can form inclusion complexes (ICs) with polymer molecules in which α-CD molecules stack in the columnar crystal to form a molecular tube. Physical mixtures of α-CD powder and oligomeric liquids such as poly(ethylene glycol) (PEG) have been shown to spontaneously form an IC, which is accompanied by a solid-state α-CD phase transformation from the cage to the columnar crystal structure. In this paper, the phase transformation is tracked with wide-angle X-ray diffraction as a function of temperature, atmospheric water vapor content and the type of guest molecule. A first-order kinetic model is used to describe the kinetics of complexation. The time required to completely complex PEG200 (200 g/mol) at low water activities is greater than 300 h, whereas only a few hours are necessary at high water activities. Solid-state complexation of α-CD with a hydrophobic guest molecule (hexatriacontane, HTC), is also reported here for the first time. Slower complexation kinetics are observed for α-CD with HTC compared to PEG600 (600 g/mol).}, number={4}, journal={POLYMER}, author={Hunt, Marcus A. and Tonelli, Alan E. and Balik, C. Maurice}, year={2008}, month={Feb}, pages={985–991} }
 @article{hunt_tonelli_balik_2007, title={Effect of guest hydrophobicity on water sorption behavior of oligomer/alpha-cyclodextrin inclusion complexes}, volume={111}, ISSN={["1520-6106"]}, DOI={10.1021/jp070145t}, abstractNote={Cyclomaltohexaose (alpha-cyclodextrin, alpha-CD) can form inclusion complexes (ICs) with polymer molecules in the columnar crystal structure in which alpha-CD molecules stack to form a molecular tube. Complementary water vapor sorption and wide-angle X-ray diffractomery (WAXD) were performed on oligomer/alpha-CD ICs to determine their structures and stabilities. To discern the effect of guest molecule hydrophobicity on water adsorption isotherms, polyethylene glycol (PEG, MW = 600 g/mol) and hexatriacontane (HTC) guests were used. Sorption isotherms for PEG/alpha-CD IC are similar to those obtained for pure alpha-CD and PEG, suggesting the presence of dethreaded PEG in the sample. WAXD collected before and after water vapor sorption of PEG/alpha-CD IC indicated a partial conversion from columnar to cage crystal structure, the thermodynamically preferred structure for pure alpha-CD, due to dethreading of PEG. This behavior does not occur for HTC/alpha-CD IC. Sorption isotherms collected at 20, 30, 40, and 50 degrees C allowed the calculation of the isosteric heats of adsorption and the integral entropies of adsorbed water which are characterized by minima that indicate the monolayer concentration of water in the ICs.}, number={15}, journal={JOURNAL OF PHYSICAL CHEMISTRY B}, author={Hunt, Marcus A. and Tonelli, Alan E. and Balik, C. Maurice}, year={2007}, month={Apr}, pages={3853–3858} }
 @article{hunt_tonelli_balik_2007, title={Effect of guest hydrophobicity on water sorption behavior of oligomer/alpha-cyclodextrin inclusion complexes (vol 111B, pg 3853, 2007)}, volume={111}, ISSN={["1520-6106"]}, DOI={10.1021/jp0733926}, abstractNote={ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionEffect of Guest Hydrophobicity on Water Sorption Behavior of Oligomer/α-Cyclodextrin Inclusion ComplexesMarcus A. Hunt, Alan E. Tonelli, and C. Maurice BalikCite this: J. Phys. Chem. B 2007, 111, 22, 6288Publication Date (Web):May 15, 2007Publication History Published online15 May 2007Published inissue 1 June 2007https://doi.org/10.1021/jp0733926Copyright © 2007 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views224Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (8 KB) Get e-Alerts Get e-Alerts}, number={22}, journal={JOURNAL OF PHYSICAL CHEMISTRY B}, author={Hunt, Marcus A. and Tonelli, Alan E. and Balik, C. Maurice}, year={2007}, month={Jun}, pages={6288–6288} }
 @article{hub_harton_hunt_fink_ade_2007, title={Influence of sample preparation and processing on observed glass transition temperatures of polymer nanocomposites}, volume={45}, ISSN={["1099-0488"]}, DOI={10.1002/polb.21249}, abstractNote={Abstract}, number={16}, journal={JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS}, author={Hub, Christian and Harton, Shane E. and Hunt, Marcus A. and Fink, Rainer and Ade, Harald}, year={2007}, month={Aug}, pages={2270–2276} }
 @article{whang_hunt_wrench_hockney_farin_tonelli_2007, title={Nonoxynol-9-alpha-cyclodextrin inclusion compound and its application for the controlled release of nonoxynol-9 spermicide}, volume={106}, ISSN={["1097-4628"]}, DOI={10.1002/app.26956}, abstractNote={Abstract}, number={6}, journal={JOURNAL OF APPLIED POLYMER SCIENCE}, author={Whang, Hyun Suk and Hunt, Marcus A. and Wrench, Nicola and Hockney, Jessica E. and Farin, Charlotte E. and Tonelli, Alan E.}, year={2007}, month={Dec}, pages={4104–4109} }
 @article{tonelli_hunt_balik_2007, title={The effect of water on the solid-state complexation of oligomers with a?cyclodextrin}, volume={40}, journal={Macromolecules}, author={Tonelli, A. E. and Hunt, M. A. and Balik, C. M.}, year={2007} }
 @article{uyar_hunt_gracz_tonelli_2006, title={Crystalline cyclodextrin inclusion compounds formed with aromatic guests: Guest-dependent stoichiometries and hydration-sensitive crystal structures}, volume={6}, ISSN={["1528-7505"]}, DOI={10.1021/cg050500+}, abstractNote={A series of solid inclusion complexes (ICs) containing the aromatic guests aniline, benzene, ethylbenzene, phenol, p-xylene, styrene, and toluene were formed with host γ-cyclodextrin (γ-CD). IC stoichiometry was observed to depend on the nature of the included aromatic guest. The molar ratio of styrene, aniline, and phenol guests to γ-CD host was ∼2:1 in their individual IC crystals, whereas ethylbenzene, p-xylene, and toluene guests formed ∼1:1 inclusion complexes with γ-CD. Thermogravimetric analysis showed that the thermal stabilities of these volatile aromatic guest molecules increased due to guest−host interactions once they were included in their γ-CD-ICs. X-ray diffraction (WAXD) observations performed on the aromatic guest−CD-IC crystals showed that all of them have channel-type crystalline structures. Moreover, it was observed that the presence of guest molecules inside the γ-CD cavities stabilized the channel structure of stacked γ-CDs. However, a solid-phase transition from tetragonal to hexago...}, number={5}, journal={CRYSTAL GROWTH & DESIGN}, author={Uyar, T and Hunt, MA and Gracz, HS and Tonelli, AE}, year={2006}, month={May}, pages={1113–1119} }
 @article{rusa_rusa_peet_uyar_fox_hunt_wang_balik_tonelli_2006, title={The nano-threading of polymers}, volume={55}, ISSN={["1573-1111"]}, DOI={10.1007/s10847-005-9038-1}, number={1-2}, journal={JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY}, author={Rusa, C. C. and Rusa, M. and Peet, J. and Uyar, T. and Fox, J. and Hunt, M. A. and Wang, X. and Balik, C. M. and Tonelli, A. E.}, year={2006}, month={Jun}, pages={185–192} }
 @article{wang_rusa_hunt_tonelli_macko_pasch_2005, title={Adsorption of polyethylene and polypropylene by zeolites: Inside or outside?}, volume={38}, ISSN={["1520-5835"]}, DOI={10.1021/MA051748a}, abstractNote={ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTAdsorption of Polyethylene and Polypropylene by Zeolites: Inside or Outside?Xingwu Wang, Cristian C. Rusa, Marcus A. Hunt, Alan E. Tonelli, Tibor Macko, and Harald PaschView Author Information Fiber & Polymer Science Program, North Carolina State University, Campus Box 8301, Raleigh, North Carolina 27695-8301, and German Institute for Polymers, Schlossgartenstr. 6, D-64289, Darmstadt, Germany Cite this: Macromolecules 2005, 38, 25, 10341–10345Publication Date (Web):November 8, 2005Publication History Received5 August 2005Revised25 October 2005Published online8 November 2005Published inissue 1 December 2005https://doi.org/10.1021/ma051748aCopyright © 2005 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views412Altmetric-Citations16LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit Read OnlinePDF (125 KB) Get e-AlertsSUBJECTS:Chromatography,Differential scanning calorimetry,Polyethylene,Polymers,Zeolites Get e-Alerts}, number={25}, journal={MACROMOLECULES}, author={Wang, XW and Rusa, CC and Hunt, MA and Tonelli, AE and Macko, T and Pasch, H}, year={2005}, month={Dec}, pages={10341–10345} }
 @article{uyar_rusa_hunt_aslan_hacaloglu_tonelli_2005, title={Reorganization and improvement of bulk polymers by processing with their cyclodextrin inclusion compounds}, volume={46}, ISSN={["1873-2291"]}, DOI={10.1016/j.polymer.2005.04.002}, abstractNote={The formation of polymer-cyclodextrin inclusion compounds of polycarbonate (PC), poly(methylmethacrylate) (PMMA) and poly(vinylacetate) (PVAc) guests with host γ-cyclodextrin (γ-CD) have been successfully achieved. Coalesced bulk polymer samples were obtained by removal of γ-CD from their inclusion compounds (ICs). The chemical and crystalline structures of ICs and coalesced PC, PMMA and PVAc were studied by Fourier transform infrared spectroscopy (FTIR) and wide-angle X-ray diffraction (WAXD). The thermal transitions, thermal stability, and degradation mechanisms of the samples were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and direct insertion probe pyrolysis mass spectrometry (DIP-MS). FTIR findings indicated that the chain conformations of the bulk polymers were altered when they were included inside the CD channels and extended chain conformations were retained when coalesced from their ICs. Significant improvements were observed in the thermal transitions observed for the coalesced polymers, with glass transitions shifted to higher temperatures. The TGA results reveal that the thermal stabilities of coalesced polymers increased slightly compared to the corresponding as-received polymers. The DIP-MS observations indicated that the thermal stability and degradation products of the polymers are affected once the polymers chains are included inside the γ-CD-IC cavities.}, number={13}, journal={POLYMER}, author={Uyar, T and Rusa, CC and Hunt, MA and Aslan, E and Hacaloglu, J and Tonelli, AE}, year={2005}, month={Jun}, pages={4762–4775} }
 @article{peet_rusa_hunt_tonelli_balik_2005, title={Solid-state complexation of poly(ethylene glycol) with alpha-cyclodextrin}, volume={38}, ISSN={["1520-5835"]}, DOI={10.1021/ma048103f}, abstractNote={Low-molecular-weight liquid poly(ethylene glycol) (PEG) spontaneously forms an inclusion compound (IC) when combined with α-cyclodextrin (α-CD) powder at room temperature. This process can be followed with wide-angle X-ray diffraction (WAXD). The WAXD data shows that the α-CD crystals undergo a solid-state crystal−crystal transformation from the cage to the channel crystal structure upon IC formation over a period of about 8 h. The time dependence of the 2θ = 20° α-CD channel structure X-ray peak can be described by a simple first-order kinetic model. The effects of changing the temperature, PEG:α-CD molar ratio, PEG molecular weight, and vacuum-drying the CD have been studied. The barrier opposing the PEG inclusion-induced solid-state transformation of α-CD from the cage to the channel crystal structure appears to be dominated by changes in the packing/interactions of α-CDs, rather than the loss in the conformational entropy experienced by the PEG chains during the inclusion process.}, number={2}, journal={MACROMOLECULES}, author={Peet, J and Rusa, CC and Hunt, MA and Tonelli, AE and Balik, CM}, year={2005}, month={Jan}, pages={537–541} }
 @article{hunt_rusa_tonelli_balik_2005, title={Structure and stability of columnar cyclomaltooctaose (gamma-cyclodextrin) hydrate}, volume={340}, ISSN={["1873-426X"]}, DOI={10.1016/j.carres.2005.03.021}, abstractNote={Rapid recrystallization of cyclomaltooctaose (gamma-cyclodextrin, gamma-CD) from aqueous solution resulted in formation of a columnar structure with only water as the guest molecule. Upon vacuum drying at 90 degrees C for 15 h, gamma-CD, which was initially in the columnar structure, became amorphous. Complementary water vapor sorption and wide-angle X-ray diffractometry experiments were performed on columnar gamma-CD in its vacuum dried and as-precipitated states to elucidate its stability in humid environments and the crystal structure present at varying sorption levels. These experiments show that both types of gamma-CD transform to the cage crystal structure upon exposure to water vapor at 40 degrees C and with an activity of 1.0. Sorption equilibrium is reached long before the crystal structure transformation is complete, indicating that a significant amount of molecular mobility exists in the various hydrated gamma-CD crystal structures.}, number={9}, journal={CARBOHYDRATE RESEARCH}, author={Hunt, MA and Rusa, CC and Tonelli, AE and Balik, CM}, year={2005}, month={Jul}, pages={1631–1637} }
 @article{patel_hunt_lin-gibson_bencherif_spontak_2005, title={Tunable CO2 transport through mixed polyether membranes}, volume={251}, ISSN={["1873-3123"]}, DOI={10.1016/j.memsci.2004.11.003}, abstractNote={Gas-separation membranes composed of polyethers such as poly(ethylene glycol)diacrylate (PEGda) or poly(propylene glycol)diacrylate (PPGda) exhibit high CO2 solubility selectivity, which makes them attractive for use in H2 and air purification. In this work, we investigate the factors governing CO2 and H2 transport in mixed polyether matrices. Addition of semicrystalline poly(ethylene oxide)s to amorphous PEGda lowers the net CO2 permeability and CO2/H2 selectivity due to crystal formation. Gas permeation through the amorphous fraction, however, remains unaffected, confirming the existence of a molecular weight limit below which the entire membrane participates in gas transport. The permeabilities of CO2 and H2, as well as their activation energy of permeation, in miscible PEGda/PPGda blends follow the linear rule of mixtures over the temperature range explored. Incorporation of amine moieties employed in liquid membranes into either the PEGda matrix during crosslinking or the PEG backbone generally reduces CO2/H2 selectivity but occasionally improves CO2 permeability.}, number={1-2}, journal={JOURNAL OF MEMBRANE SCIENCE}, author={Patel, NP and Hunt, MA and Lin-Gibson, S and Bencherif, S and Spontak, RJ}, year={2005}, month={Apr}, pages={51–57} }
 @article{rusa_uyar_rusa_hunt_wang_tonelli_2004, title={An intimate polycarbonate/poly(methyl methacrylate)/poly(vinyl acetate) ternary blend via coalescence from their common inclusion compound with gamma-cyclodextrin}, volume={42}, ISSN={["1099-0488"]}, DOI={10.1002/polb.20273}, abstractNote={Abstract}, number={22}, journal={JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS}, author={Rusa, CC and Uyar, T and Rusa, M and Hunt, MA and Wang, XW and Tonelli, AE}, year={2004}, month={Nov}, pages={4182–4194} }
 @article{hunt_jung_shamsheer_uyar_tonelli_2004, title={Polystyrenes in channels}, volume={45}, ISSN={["1873-2291"]}, DOI={10.1016/j.polymer.2003.03.002}, abstractNote={Polystyrenes (PS) with various stereosequences have been modeled in narrow cylindrical channels corresponding to those found in polymer–inclusion compounds (ICs), such as those formed with host cyclodextrins (CDs), where the polymers reside as guests. Isotactic (i) PS is found to fit in channels with narrower diameters (D) than syndiotactic (s) PS, when both adopt conformations permitted by the Yoon, Sundararajan, Flory RIS conformational model of PSs, while atactic (a) PS can be included in channels with D intermediate to those for i- and s-PS. In ICs formed with host γ-CD and guest a-PS homopolymer and guest poly(ϵ-caprolactone) (PCL)-b-a-PS diblock copolymer it was observed that the a-PS homopolymer and the a-PS copolymer blocks were and were not included, respectively. Thus, it appears that a-PS is barely able to be threaded by γ-CD, whose internal diameter is ∼8 Å. Because the channel conformers found for i- and s-PS have smaller and larger diameters, respectively, than those found for a-PS, we would expect i-PS to be complexed by γ-CD, while s-PS might not. As a consequence IC formation with γ-CD may provide a means to physically separate the stereoregular forms of polystyrene. In addition, only the mrm and rmr PS stereoisomers show channel conformations with significant probabilities, so we suggest that in situ polymerization of styrene monomer in the narrow channels of its IC formed with γ-CD might produce a new stereoregular form of PS with regularly alternating m and r diads.}, number={4}, journal={POLYMER}, author={Hunt, MA and Jung, DW and Shamsheer, M and Uyar, T and Tonelli, AE}, year={2004}, month={Feb}, pages={1345–1347} }
 @article{hunt_rusa_tonelli_balik_2004, title={Structure and stability of columnar cyclomaltohexaose (alpha-cyclodextrin) hydrate}, volume={339}, ISSN={["1873-426X"]}, DOI={10.1016/j.carres.2004.09.012}, abstractNote={Rapid recrystallization of cyclomaltohexaose (α-cyclodextrin, α-CD) from aqueous solution resulted in formation of the columnar crystal structure of α-CD containing only water as the guest molecule. Complementary water vapor sorption and wide-angle X-ray diffractometry (WAXD) experiments were performed on the α-CD columnar structure to elucidate the crystal structure present at varying sorption levels. Equilibrium isothermal water vapor sorption experiments at 40 °C revealed that the α-CD columnar structure is unstable above a water activity of approximately 0.67. This was confirmed by WAXD diffractograms collected over time, which further revealed that α-CD columnar structure undergoes a phase transformation to the cage structure after approximately 0.25 h at 40 °C and a water activity of 1.0.}, number={17}, journal={CARBOHYDRATE RESEARCH}, author={Hunt, MA and Rusa, CC and Tonelli, AE and Balik, CM}, year={2004}, month={Dec}, pages={2805–2810} }
 @article{topchieva_tonelli_panova_matuchina_kalashnikov_gerasimov_rusa_rusa_hunt_2004, title={Two-phase channel structures based on alpha-cyclodextrin-polyethylene glycol inclusion complexes}, volume={20}, ISSN={["0743-7463"]}, DOI={10.1021/la048970d}, abstractNote={Wide-angle X-ray scattering observations of α-cyclodextrin (CD)−poly(ethylene glycol) (PEG) inclusion complexes (ICs) have shown for the first time that two crystalline columnar modifications (forms I and II) are produced in the process of their formation. This was made possible by precise azimuthal X-ray diffraction scanning of oriented IC samples. Form I is characterized by CDs threaded onto PEG chains and arranged along channels in the order head-to-head/tail-to-tail, while form II is formed by unbound CDs also arranged into columns in a head-to-tail and also possibly a head-to-head/tail-to-tail manner, probably as a result of template crystallization on the form I IC crystals. It was shown that similar structural peculiarities are inherent for channel structures based on ICs obtained with PEG with a wide range of molecular weights (MWs). The characteristic feature of ICs based on PEG, especially with MW > 8000, is the presence of unbound polymer in the composition of the complex. The amount of unbound...}, number={21}, journal={LANGMUIR}, author={Topchieva, IN and Tonelli, AE and Panova, IG and Matuchina, EV and Kalashnikov, FA and Gerasimov, VI and Rusa, CC and Rusa, M and Hunt, MA}, year={2004}, month={Oct}, pages={9036–9043} }