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Effects of reprocessing on the structure and mechanical properties of poly(trimethylene terephthalate)
Author(s) -
Ramiro J.,
Eguiazábal J. I.,
Nazábal J.
Publication year - 2002
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.11245
Subject(s) - polyester , extrusion , materials science , modulus , polymer , yield (engineering) , reactive extrusion , polymer chemistry , composite material , volume (thermodynamics) , chemical engineering , thermodynamics , engineering , physics
The effects of reprocessing by extrusion for up to four cycles on the structure and mechanical properties of poly(trimethylene terephthalate) (PTT) were studied. Reprocessing did not change the chemical structure of the polymer but led to both yellowing and molecular weight reduction. Young's modulus and the yield stress of PTT remained constant or decreased with successive extrusion cycles, probably because of the observed slight specific volume increase. The continuous reduction in the break properties due to reprocessing was smaller than that found in similar polyesters and was attributed to the molecular weight reduction. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2775–2780, 2002