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Effects of catalyst on sequence distribution and transparency of poly(tetramethylene terephthalate)–poly(tetramethylene ether) segmented copolymers
Author(s) -
Shi Youheng,
Wu Meiyan
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070571107
Subject(s) - triethanolamine , titanate , copolymer , materials science , polymer chemistry , catalysis , ether , polyester , triad (sociology) , polymer , chemistry , organic chemistry , ceramic , composite material , analytical chemistry (journal) , psychology , psychoanalysis
Polyether‐polyester segmented copolymer based on hard segments of tetramethylene terephthalate (PBT) and soft segments of poly(tetramethylene ether glycol) (PTMG) was synthesized by four kinds of catalyst: tetrabutyl titanate and magnesium acetate (Ti‐Mg); tetrabutyl titanate and triethanolamine; tetra(isopropyl) titanate; and isopropoxy(triethanolaminato) titanate, respectively. Their segment sequence distributions were analyzed by 13 C‐NMR, based on different chemical shifts of aromatic quaternary carbons in the three different triad sequences. The effects of catalyst on sequence distribution and transparency were investigated. It was found that the copolymer has lower probability of B‐T‐B when Ti‐Mg was used as catalysts, and results in higher transparency. © 1995 John Wiley & Sons, Inc.