Isothermal Crystallization Kinetics Study on Aqueous Solution of Poly(vinyl methyl ether) by FTIR and Optical Microscopy Method
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- 作者：Tianzhu Zhang ; Erik Nies ; Ginka Todorova ; Ting Li ; Hugo Berghmans ; Liqin Ge
- 刊名：Journal of Physical Chemistry B
- 出版年：2008
- 出版时间：May 8, 2008
- 年：2008
- 卷：112
- 期：18
- 页码：5611 - 5615
- 全文大小：207K
- 年卷期：v.112,no.18(May 8, 2008)
- ISSN：1520-5207
文摘
A study on the isothermal crystallization kinetics of aqueous solution of poly (vinyl methyl ether) (PVME)was carried out by Fourier transform infrared (FTIR) and optical microscopy respectively. IR spectra ofPVME solution were measured as a function of time under the isothermal crystallization conditions. With theprocess of crystallization, the phase of solution changes from transparent state to opaque one within around1-2 min for 40 or 45 wt % PVME sample, the C-H symmetric stretching bands (
s(CH3)) shift to lowerwave number 2823 cm-1. The red shift of s(CH3) absorption band was not observed in the transparentnoncrystallization area. Using the temperature jump method, we determined the growth rate of ice crystalbetween the glass transition temperature Tg and the melting temperature Tm. At the different crystallizationtemperatures Tc, the different morphologies and dimension of ice crystal are also observed.
s(CH3)) shift to lowerwave number 2823 cm-1. The red shift of s(CH3) absorption band was not observed in the transparentnoncrystallization area. Using the temperature jump method, we determined the growth rate of ice crystalbetween the glass transition temperature Tg and the melting temperature Tm. At the different crystallizationtemperatures Tc, the different morphologies and dimension of ice crystal are also observed.