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Studies on thermal stability and behaviour of polyacetal and thermoplastic polyurethane elastomer blends
Author(s) -
Kumar G.,
Mahesh L.,
Neelakantan N. R.,
Subramanian N.
Publication year - 1993
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990310311
Subject(s) - materials science , thermoplastic polyurethane , polyoxymethylene , composite material , heat deflection temperature , elastomer , thermoplastic elastomer , thermal stability , reactive extrusion , activation energy , extrusion , melt flow index , izod impact strength test , copolymer , polymer , chemical engineering , ultimate tensile strength , chemistry , organic chemistry , engineering
The influence of thermoplastic polyurethane (TPU) elastomer on the rigidity of polyacetal (polyoxymethylene, POM) was studied by determining heat deflection temperature (HDT). The higher the content of TPU in the POM/TPU blend, the lower the HDT of the blend, as would be expected. A comparative study of the recycle capability of POM and the blends was carried out by measuring melt flow index (MFI) on each successive extrusion. Stress‐strain behaviour of the virgin material and that obtained after fourth‐time extrusion was analysed for POM and the blends. The effect of γ‐radiation on the mechanical behaviour of the blends was investigated. The kinetics of thermal degradation of POM, TPU and their blends was studied. The kinetic parameters, viz. activation energy and the order of reaction, were established. The values of the activation energy of the blends were found to be higher than those of the POM and TPU, indicating improved stability of the resultant blends.