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Poly (butyleneterephthalate)‐ethylenevinylacetate polymer blends
Author(s) -
Pilati Francesco
Publication year - 1983
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.760231310
Subject(s) - materials science , polymerization , copolymer , polymer , polymer chemistry , volatility (finance) , ethylene , chemical engineering , organic chemistry , composite material , catalysis , chemistry , financial economics , engineering , economics
Polymerization of dimethylterephthalate (DMT) and 1,4‐butanediol (4G) carried out in the presence of about 15 weight percent of ethylene‐co‐vinylacetate copolymers (EVA), gave blends with average dimensions of the “soft domains” of a few microns. During polymerization, reaction between EVA and poly(butyleneterepthalate) (PBTP) takes place leading to the formation of macromolecules of PBTP‐g‐EVA and crosslinked EVA in addition to unreacted EVA and linear PBTP. These different chemical structures can be fractionated by selective solubility and quantitatively measured. Their relative amounts depend particularly on the percentage of vinylacetate (VA) in the initial EVA and on the time of reaction. During polymerization there is a retarding effect on the increasing of the molecular weight of linear PBTP which can be ascribed to the lower volatility of the acetate by‐products, derived from the reaction with EVA, which act as monofunctional impurities.