Influence of thermal aging on tensile and creep behavior of thermoplastic polyurethane

被引：59

作者：

Boubakri, A. ^{[1
]}

Haddar, N. ^{[1
]}

Elleuch, K. ^{[1
]}

Bienvenu, Y. ^{[2
]}

机构：

[1] URCIM ENIS, Unite Rech Chim Ind & Mat, Sfax, Tunisia

[2] Ecole Mines Paris, Ctr Mat PM Fourt, F-91003 Evry, France

来源：

COMPTES RENDUS MECANIQUE | 2011年 / 339卷 / 10期

关键词：

Thermoplastic polyurethane; Thermal aging; Mechanical properties; MOLECULAR-WEIGHT POLYETHYLENE; DIFFERENT WEATHERING TESTS; NATURAL-RUBBER; PART; COMPOSITES; DEGRADATION; OXIDATION; PRESSURE; BLENDS; FILMS;

D O I：

10.1016/j.crme.2011.07.003

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Changes in mechanical and physical properties of polyurethane thermoplastic during aging at 70 C and 90 C were investigated. The loss weight response was analyzed by gravimetric measurements under these temperatures. Changes in appearance and morphology of TPU after thermal aging were revealed by optical microscopy. The prolongation of the thermal exposure time, up to 270 days, leads to a progressive increase in tensile strength. In fact, elastic modulus and stress at 200% of strain were increased with thermal exposure time. These results can be explained by the increase of thermal stability due to the increase of material rigidity and the decrease in chain mobility. The evolution of the mechanical properties from tensile tests seems to be well correlated to the creep behavior. Finally, Scanning Electron Microscopy (SEM) revealed the modification of TPU morphology fracture surface after thermal aging. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.

引用

页码：666 / 673

页数：8

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