Author/Authors :
Chen، نويسنده , , Jinglu and Zheng، نويسنده , , Guishan and Xu، نويسنده , , Long and Lu، نويسنده , , Yun and Xue، نويسنده , , Gi and Yang، نويسنده , , Yingsong and Zhang، نويسنده , , Jun، نويسنده ,
Abstract :
The conformation of atactic poly(methyl methacrylate) (a-PMMA) freeze-extracted from solvents of various molecular size was investigated by IR and Raman spectroscopy. IR studies showed that self-aggregates and partial helix conformation of polymer chain existed in the annealed a-PMMA sample freeze-extracted from a-PMMA/poly(ethylene glycol) (PEG) solution. Temperature dependence of IR I1240 cm−1/I1270 cm−1 ratio indicated that a-PMMA freeze-extracted from PEG had lower backbone conformational energy than that from dioxane. FT-Raman spectroscopies showed that strong interaction existed between a-PMMA and dioxane, while little solute–solvent interaction existed in the a-PMMA/PEG system.
