@article{porbeni_shin_shuai_wang_white_jia_tonelli_2005, title={Morphology and dynamics of the poly(epsilon-caprolactone)-b-poly(L-lactide) diblock copolymer and its inclusion compound with alpha-cyclodextrin: A solid-state C-13 NMR study}, volume={43}, ISSN={["1099-0488"]}, DOI={10.1002/polb.20490}, abstractNote={Abstract}, number={15}, journal={JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS}, author={Porbeni, FE and Shin, ID and Shuai, XT and Wang, XW and White, JL and Jia, X and Tonelli, AE}, year={2005}, month={Aug}, pages={2086–2096} }
 @article{jia_wang_tonelli_white_2005, title={Two-dimensional spin-diffusion NMR reveals differential mixing in biodegradable polymer blends}, volume={38}, ISSN={["1520-5835"]}, DOI={10.1021/ma047838h}, abstractNote={Length scales of mixing in amorphous blends of solid PCL (polycaprolactone) and PLLA (poly-l-lactic acid) were investigated as a function of preparation method. A recently described two-dimensional heteronuclear correlation (Hetcor) spin-diffusion technique (Jia et al. Macromolecules 2003, 36, 712) revealed that PCL/PLLA blends with shorter length scales of mixing, relative to solution blending, could be prepared using inclusion-compound coalescence methods (Rusa et al. Macromolecules 2000, 33, 5321). These biocompatible and biodegradable polymer blends provide a clear example of the utility of the 2D Hetcor spin-diffusion method for quantitative miscibility and phase analysis in amorphous macromolecules and their blends. The rates for intrapolymer polarization transfer vs interchain/interdomain polarization equilibration were easily differentiated using the 2D technique for either blend. As a result, spin-diffusion coefficients and miscibility length scales could be calculated by direct measurement on th...}, number={7}, journal={MACROMOLECULES}, author={Jia, X and Wang, XW and Tonelli, AE and White, JL}, year={2005}, month={Apr}, pages={2775–2780} }
 @article{jia_wolak_wang_white_2003, title={Independent calibration of H-1 spin-diffusion coefficients in amorphous polymers by intramolecular polarization transfer}, volume={36}, ISSN={["0024-9297"]}, DOI={10.1021/ma0215316}, abstractNote={We report a general method, based on intramolecular spin diffusion, for the measurement and calculation of spin-diffusion coefficients in amorphous polymers and their blends using only NMR data. The basic structural unit that defines 1H polarization density in polymers is the monomer unit. Using appropriately selected internal reference distances calculated from energy-minimized chain dimension simulations, time scales for the redistribution of 1H polarization within amorphous homopolymers may be used to independently calculate maximum values of the spin-diffusion coefficients D. This strategy represents an attractive alternative to current methods employed for domain size measurements in polymer blends, which require calibration of spin-diffusion coefficients based on comparisons of similar NMR data obtained on model compounds analyzed previously using scattering or microscopy techniques. In this way, many more polymer systems become amenable to study by NMR spin-diffusion methods, since X-ray scattering...}, number={3}, journal={MACROMOLECULES}, author={Jia, X and Wolak, J and Wang, XW and White, JL}, year={2003}, month={Feb}, pages={712–718} }
 @article{wolak_jia_gracz_stejskal_white_wachowicz_jurga_2003, title={Polyolefin miscibility: Solid-state NMR investigation of phase behavior in saturated hydrocarbon blends}, volume={36}, ISSN={["0024-9297"]}, DOI={10.1021/ma0301449}, abstractNote={Chain-level mixing in polyolefins is investigated for blends of polyisobutylene (PIB) and polyethylene-co-1-butene (PEB). Previous reports suggest that PIB exhibits unusual mixing behavior in certain saturated blends relative to other polyolefins, even though it is immiscible with most. Variable-temperature 1H, 2H, 13C, and 129Xe NMR experiments are used to characterize local PIB chain dynamics in blends with PEB in which the concentration of 1-butene comonomer units is 23 or 66 wt %. Results from 1D and 2D solid-state 13C exchange experiments, 1H relaxation measurements, and 2H line shape analysis indicate that local conformational dynamics of the PIB CH2 group in the polymer backbone increase significantly in blends with PEB copolymers containing 66 wt % butene comonomer (PEB-66). Even though the PEB-66 is a higher Tg polymer than PIB, PIB exhibits a lower effective Tg when the blend is formed relative to its pure state. Similar perturbations are not observed in the PIB/PEB-23 blend, indicating that thi...}, number={13}, journal={MACROMOLECULES}, author={Wolak, J and Jia, X and Gracz, H and Stejskal, EO and White, JL and Wachowicz, M and Jurga, S}, year={2003}, month={Jul}, pages={4844–4850} }
 @article{wolak_jia_white_2003, title={The  glass transition time scale and configurational entropy in polymers: An experimental molecular view}, volume={125}, DOI={10.1021/ja037736b}, number={45}, journal={Journal of the American Chemical Society}, author={Wolak, J. E. and Jia, X. and White, J. L.}, year={2003}, pages={13660–13661} }
 @article{wang_coleman_jia_white_2002, title={Quantitative investigations of acidity, and transient acidity, in zeolites and molecular sieves}, volume={106}, number={19}, journal={Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces & Biophysical}, author={Wang, X. W. and Coleman, J. and Jia, X. and White, J. L.}, year={2002}, pages={4941–4946} }