The chemical structure of copolymer formed in the transesterification of PPSQ/PET blendsduring melt-processing is deduced from the;H-NMR spectra. The transesterification extent ofthis blend is interpreted by the chang...The chemical structure of copolymer formed in the transesterification of PPSQ/PET blendsduring melt-processing is deduced from the;H-NMR spectra. The transesterification extent ofthis blend is interpreted by the changes of crystalline melting peak in DSC thermograms of the in-soluble products containing unreacted PET and some block PPSQ segments. Effects of composi-tion of blend ladderlike regularity of PPSQ on the reaction extent have also been discussed.Inclusion of some block PPSQ segments in PET has no influence on the crystalline morphology ofPET.展开更多
基金This work was supported by the National Natural Science Foundation of China,Polymer Physics Laboratory,Academia Sinica and the United Center of Analysis and Measurements in Zhong Guan Cun.
文摘The chemical structure of copolymer formed in the transesterification of PPSQ/PET blendsduring melt-processing is deduced from the;H-NMR spectra. The transesterification extent ofthis blend is interpreted by the changes of crystalline melting peak in DSC thermograms of the in-soluble products containing unreacted PET and some block PPSQ segments. Effects of composi-tion of blend ladderlike regularity of PPSQ on the reaction extent have also been discussed.Inclusion of some block PPSQ segments in PET has no influence on the crystalline morphology ofPET.