Abstract
PB(GAS)/PBT block copolyesters of poly(butylene glutarate-co-adipate-co-succinate), PB(GAS), and poly(butylene terephthalate), PBT, were prepared by molten-state processing for different times. The degree of randomness, melting temperature, and crystallization behavior for these copolyesters were studied by means of 1H NMR spectroscopy, DSC, and wide angles X-ray diffraction. Average block length, L̄n̄Āl̄ and L̄n̄Ār̄, of aliphatic and aromatic sequences obviously decreased with mixing time. Melting points also moved to lower temperature with mixing time. PB(GAS) sequences in copolyesters were completely excluded from the crystal formation of block copolyesters.
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