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Transesterifications in a polyblend of poly(butylene terephthalate) and a liquid crystalline polyester
Author(s) -
Jo ByungWook,
Chang JinHae,
Jin JungIl
Publication year - 1995
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760352007
Subject(s) - polyester , materials science , triad (sociology) , copolymer , polymer chemistry , liquid crystalline , binary number , proton nmr , differential scanning calorimetry , composite material , chemical engineering , polymer science , thermodynamics , organic chemistry , polymer , mathematics , chemistry , psychology , physics , arithmetic , psychoanalysis , engineering
Transesterfication between a liquid crystalline polyster and poly(butylene terephthalate) was followed quantitatively by analyzing 13 C‐NMR spectra of the 50:50 blend after heat treatmetn at 290°C for varying lengths of time. Differential scanning nalysis was employed to follow the interchange reactions. From analysis of triad sequences of the transesterified blends, it was clear that measurable exchange reactions occurred when the blend was kept at 290°C for 20 min. The distribution of sequences tends to approach that of a statistical binary copolymer as the heat treatment period is increased. The results ontained from this investigation show that polyblends between an LC polyesterand conventional polyesters must be handled carefully. Otherwise, ester interchange reactions are inevitable.