Thermal and mechanical behaviour of crystalline poly(ethylene terephthalate) : effects of high temperature annealing and tensile drawing
Thermal and mechanical behaviour of crystalline poly(ethylene terephthalate) : effects of high temperature annealing and tensile drawing
复制标题
结晶聚对苯二甲酸乙二醇酯的热和机械行为：高温退火和拉伸拉伸的影响
DOI：
10.1016/0032-3861(91)90161-b
复制
发表时间：
1991
期刊：
影响因子：
4.6
通讯作者：
F. Rietsch
中科院分区：
文献类型：
--
作者：
R. Elenga;R. Seguela;F. Rietsch
本文研究了结晶聚对苯二甲酸乙二酯的熔融行为和若干力学性能，特别注意了高温热退火的影响。虽然在差示扫描量热法（d.s.c.）等温退火样品的曲线可归因于加热扫描过程中的重结晶过程，这表明，在中等结晶温度下生长的链折叠层状晶体在经受高温退火时经历形态变化为边缘胶束晶体。这一结论是从退火处理引起的样品机械性能的显著变化以及拉伸样品的热行为推断出来的。这种变态归因于酯交换反应，其在高温下将无定形层的链折叠转变为晶间结分子。
The melting behaviour and several mechanical properties of crystallized poly(ethylene terephthalate) have been investigated paying particular attention to the effect of thermal annealing at high temperature. Although the occurrence of a double melting peak in the differential scanning calorimetry (d.s.c.) curves of isothermally annealed samples can be undeniably ascribed to a recrystallization process during the heating scan, it is suggested that the chain-folded lamellar crystals grown at a moderate crystallization temperature undergo a morphological change into fringed-micelle crystals when submitted to a high temperature annealing. This conclusion is inferred from the striking changes of the mechanical properties of the samples which result from the annealing treatment, in conjunction with the thermal behaviour of drawn samples. This metamorphosis is attributed to ester interchange reactions which turn the chain folds of the amorphous layers into intercrystalline tie molecules at high temperature.