@article{narayanan_caydamli_tekinalp_matai_boy_chung_shen_gupta_tonelli_2018, title={Thermal, mechanical, and topographical evaluation of nonstoichiometric alpha-cyclodextrin/poly(epsilon-caprolactone) pseudorotaxane nucleated poly(epsilon-caprolactone) composite films}, volume={56}, ISSN={["1099-0488"]}, DOI={10.1002/polb.24741}, abstractNote={ABSTRACTThree pseudorotaxanes (PpR) comprised of poly (ε‐caprolactone) (PCL) and α‐cyclodextrin (α‐CD) with varying stoichiometric ratios were synthesized and characterized. Wide‐angle X‐ray diffraction (WAXD) and thermogravimetric (TGA) analyses provided conclusive evidence for complexation between the guest PCL and host α‐CD. The as‐synthesized and characterized PpRs were used at 10 and 20% concentrations as nucleants to promote the bulk PCL crystallization in composite films. Both WAXD and TGA provided evidence for intact PpR structures in the composite films. Isothermal differential scanning calorimetric (I‐DSC) analyses, performed at various crystallization temperatures demonstrated significant differences in the crystallization patterns among the composite films. In addition, I‐DSC analyses showed higher Avrami constant values (n) in the PpR‐nucleated composite PCL films (n ~ 3), indicating 3‐dimensional crystal growth. In the case of neat PCL films, however, lower n values indicated crystal growth in 1‐dimensions or 2‐dimensions. Moreover, atomic force microscopic analyses showed large crests and pits in PpR‐nucleated PCL composites, with irregular morphologies leading to higher surface roughness. To the contrary, the crests and pits were much smaller in the neat PCL films, resulting in lower surface roughness values. Finally, mechanical testing revealed higher tensile strength for PpR‐nucleated PCL composites films, demonstrating larger load bearing capabilities. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 1529–1537}, number={22}, journal={JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS}, publisher={Wiley}, author={Narayanan, Ganesh and Caydamli, Yavuz and Tekinalp, Halil and Matai, Ishita and Boy, Ramiz and Chung, Ching-Chang and Shen, Jialong and Gupta, Bhupender S. and Tonelli, Alan E.}, year={2018}, month={Nov}, pages={1529–1537} }
 @article{narayanan_tekbudak_caydamli_dong_krause_2017, title={Accuracy of electrospun fiber diameters: The importance of sampling and person-to-person variation}, volume={61}, ISSN={["1873-2348"]}, DOI={10.1016/j.polymertesting.2017.04.017}, abstractNote={Potential sampling errors (regional variation) on an electrospun mat were explored and person-to-person (analyst affect) variation in image analysis of the fiber diameter were investigated via detailed statistical analyses. Scanning electron microscope (SEM) samples were prepared from the vertical midline of a single non-woven mat of electrospun polyethylene oxide. Thirteen analysts with identical training and instructions measured the diameters of the nanofibers from the six SEM images and statistical analyses were performed on the resulting data. The fiber diameters were significantly different in the lower region than the upper and center regions. Furthermore, the fiber diameters in the lower region—from micrographs taken only millimeters apart—were statistically different demonstrating a statistically significant regional variation in the sample. Furthermore, statistically significant variation between the analysts also was observed, with the average fiber diameter ranging from 166 nm to 276 nm.}, journal={POLYMER TESTING}, author={Narayanan, Ganesh and Tekbudak, Merve Yasemin and Caydamli, Yavuz and Dong, Ju and Krause, Wendy E.}, year={2017}, month={Aug}, pages={240–248} }
 @article{caydamli_yildirim_shen_fang_pasquinelli_spontak_tonelli_2017, title={Nanoscale considerations responsible for diverse macroscopic phase behavior in monosubstituted isobutyl-POSS/poly(ethylene oxide) blends}, volume={13}, ISSN={["1744-6848"]}, url={https://doi.org/10.1039/C7SM01788J}, DOI={10.1039/c7sm01788j}, abstractNote={Nanocomposites prepared by incorporating polyhedral oligomeric silsesquioxane (POSS) into polymer matrices afford versatile hybrid materials but are exquisitely sensitive to even POSS monofunctionalization.}, number={46}, journal={SOFT MATTER}, publisher={Royal Society of Chemistry (RSC)}, author={Caydamli, Yavuz and Yildirim, Erol and Shen, Jialong and Fang, Xiaomeng and Pasquinelli, Melissa A. and Spontak, Richard J. and Tonelli, Alan E.}, year={2017}, month={Dec}, pages={8672–8677} }
 @article{shen_caydamli_gurarslan_li_tonelli_2017, title={The glass transition temperatures of amorphous linear aliphatic polyesters}, volume={124}, ISSN={["1873-2291"]}, DOI={10.1016/j.polymer.2017.07.054}, abstractNote={A series of wholly amorphous linear aliphatic co- and tetra-polyesters were synthesized via bulk melt step-growth polymerization. Their glass transition temperatures were determined using DSC and were essentially unaffected by crystallinity. The glass transition temperatures of the polyesters increase linearly with the ratio of ester groups per methylene group. Extrapolations of the ratio to zero ester group content gave a reliable value for the Tg of amorphous polyethylene (PE). The experimental Tgs manifest a steeper slope on the Tg vs. ester group content plot compared to those calculated using Van Krevelen's group contribution method. The intramolecular equilibrium flexibilities were evaluated through the calculation of conformational entropies of individual polymer chains approximated by considering solely the short-range interactions between neighboring groups, as embodied in their RIS conformational models. Their calculated conformational entropies, Sconf, decrease linearly with increasing ester group content, leading to the observation that Sconf ∝1/Tg.}, journal={POLYMER}, author={Shen, Jialong and Caydamli, Yavuz and Gurarslan, Alper and Li, Shanshan and Tonelli, Alan E.}, year={2017}, month={Aug}, pages={235–245} }
 @article{gurarslan_caydamli_shen_tse_yetukuri_tonelli_2015, title={Coalesced Poly(epsilon-caprolactone) Fibers Are Stronger}, volume={16}, ISSN={["1526-4602"]}, DOI={10.1021/bm501799y}, abstractNote={Melt-spun fibers were made from poly(ε-caprolactone) (PCL) coalesced from stoichiometric inclusion complex crystals formed with host urea. Melting and crystallization behaviors, mechanical properties, and the birefringence of undrawn and cold-drawn fibers were investigated. Undrawn coalesced PCL fibers were observed to have 500-600% higher moduli than undrawn as-received (asr) PCL fibers and a modulus comparable to drawn asr PCL fibers. Drawn coalesced PCL fibers have the highest crystallinity, orientation, and 65% higher moduli than drawn asr PCL fibers. Drawn coalesced PCL fibers have only a 5% higher crystallinity than drawn asr PCL fibers, yet they have 65% higher moduli and lower elongation at break values. Clearly, the intrinsic alignment of the coalesced polymers is the reason for their higher moduli and lower elongation, as confirmed by the birefringence observed in drawn coalesced and asr-PCL fibers. The improved mechanical properties of coalesced PCL fibers make them a better candidate for use in tissue engineering as scaffolds.}, number={3}, journal={BIOMACROMOLECULES}, author={Gurarslan, Alper and Caydamli, Yavuz and Shen, Jialong and Tse, Shiaomeng and Yetukuri, Mahijeeth and Tonelli, Alan E.}, year={2015}, month={Mar}, pages={890–893} }
 @article{yang_caydamli_fang_tonelli_2015, title={Crystallization Behaviors of Modified Poly(ethylene terephthalate) and Their Self-nucleation Ability}, volume={300}, ISSN={["1439-2054"]}, DOI={10.1002/mame.201400348}, abstractNote={A poly(ethylene terephthalate) (PET)/allylisobutyl polyhedral oligomeric silsesquioxanes (a‐POSS) nanocomposite is prepared by a solvent‐casting method and as‐received PET (asr‐PET) is modified by a precipitation method to yield precipitated PET (p‐PET). Their crystallization behaviors have been studied, and both modification methods improved the crystallization temperatures and crystallinities of PET. They were subsequently used to further nucleate asr‐PET at 1 and 5 wt% levels to form self‐nucleated PETs, with higher crystallization temperatures and higher crystallinities. Thermogravimetric analyses (TGA) show their thermal stabilities have been improved, and both self‐nucleated PETs have superior mechanical properties.}, number={4}, journal={MACROMOLECULAR MATERIALS AND ENGINEERING}, author={Yang, Hui and Caydamli, Yavuz and Fang, Xiaomeng and Tonelli, Alan E.}, year={2015}, month={Apr}, pages={403–413} }
 @article{gurarslan_shen_caydamli_tonelli_2015, title={Pyriproxyfen cyclodextrin inclusion compounds}, volume={82}, ISSN={["1573-1111"]}, DOI={10.1007/s10847-015-0526-7}, number={3-4}, journal={JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY}, author={Gurarslan, Alper and Shen, Jialong and Caydamli, Yavuz and Tonelli, Alan E.}, year={2015}, month={Aug}, pages={489–496} }
 @article{caydamli_ding_joijode_li_shen_zhu_tonelli_2015, title={Estimating Monomer Sequence Distributions in Tetrapolyacrylates}, volume={48}, ISSN={["1520-5835"]}, DOI={10.1021/ma5019268}, abstractNote={Recently Ting et al. [ACS Macro Lett. 2013, 2, 770−774] described the syntheses of acrylic tetrapolymers with controlled molecular weights and tetramonomer compositions. Relative reactivity ratios of all monomer pairs were determined and used in the Walling–Briggs terminal copolymerization model along with Skeist’s equations to address the expected compositional drift in the monomer feed ratios. The anticipated control of monomer incorporation based on this approach was verified experimentally on several tetrapolyacrylates synthesized by RAFT polymerization, which additionally controlled their molecular weights. Their “new and simple paradigm combining both predictive models provides complementary synthetic and predictive tools for designing macromolecular chemical architectures with hierarchical control over spatially dependent structure–property relationships for complex applications” is extended here to the derivation of expected monad compositions, and diad, triad, and tetrad monomer sequence distribu...}, number={1}, journal={MACROMOLECULES}, author={Caydamli, Yavuz and Ding, Yi and Joijode, Abhay and Li, Shanshan and Shen, Jialong and Zhu, Jiadeng and Tonelli, Alan E.}, year={2015}, month={Jan}, pages={58–63} }