CHARACTERIZATION OF COMPOSITIONAL HETEROGENEITY OF SEGMENTED COPOLYMERS BY GPC TECHNIQUE

摘要

＜正＞ The GPC technique wth two detectors has been used to study the heterogeneity in compositionthard segment content) of a series of polyethylene terephthalate/polycaprolactone segmented copoly-mers. Improvement in data treatment has been made to avoid the difficulty resulted from the lake oflow molecular weight hard segment homopolymers. Results show that for each sample the moleculesof larger coil size in CHCI3 usually have higher hard segment content. A parameter, the averagedeviation of hard segment content, has been proposed to characterize the heterogeneity in compositionof the samples. It is found that the heterogeneity of the samples increases with increasing theiraverage hard segment content.