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Micromechanical properties of polyether block amide copolymers
Author(s) -
Alberola Nicole
Publication year - 1988
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.1988.070360405
Subject(s) - copolymer , dynamic mechanical analysis , glass transition , differential scanning calorimetry , polyamide , materials science , polymer chemistry , amide , relaxation (psychology) , dynamic modulus , modulus , composite material , polymer , chemical engineering , chemistry , thermodynamics , organic chemistry , physics , psychology , social psychology , engineering
A series of polyether block amide copolymers based on poly(tetramethylene oxide) of molecular weight 1000 or 2000 and polyamide 12 of molecular weight between 600 and 4000 with varying PE/PA weight ratio (from 80 to 20%) were studied by using dynamic mechanical spectroscopy and differential scanning calorimetry. Dynamic mechanical experiments showed three main relaxation peaks related to, the subglass transition of the soft segments, the glass transition of the soft segments, and the glass transition of the hard segments. A quench, carried out on a 70% PA copolymer from 110 to 15°C, leads to a decrease in the storage modulus. This result should be related to the destruction of physical ties.