Xl. Luo et al., COMPOSITIONAL HETEROGENEITY OF ETHYLENE T EREPHTHALATE-ETHYLENE OXIDESEGMENTED COPOLYMER WITH LONG SOFT SEGMENT, Gaodeng xuexiao huaxue xuebao, 18(4), 1997, pp. 642-646
The series of ethylene terephthalate-ethylene oxide segmented copolyme
rs with different long soft segments and different hard segment conten
ts have been synthesized, The hard segment contents are measured by H-
1 NMR, Four PET-PEG segmented copolymers were separated into soluble a
nd insoluble parts in chloroform, The results have revealed a very evi
dent compositional heterogeneity in these four samples, which depends
on the molecular weight of soft segment and hard segment content, Simu
ltaneously the melting and thermal spectra of the four PET-PEG segment
ed copolymers were obtained by DSC, The soluble and insoluble parts ha
ve shown the quite different crystallizability both for soft and hard
segments, which has the good correspondence with the compositional het
erogeneity.