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首页> 外文期刊>Journal of Applied Polymer Science >DEFORMATION-INDUCED CONFORMATIONAL CHANGES IN STRETCHED SAMPLES OF AMORPHOUS POLY(ETHYLENE TEREPHTHALATE)
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DEFORMATION-INDUCED CONFORMATIONAL CHANGES IN STRETCHED SAMPLES OF AMORPHOUS POLY(ETHYLENE TEREPHTHALATE)

机译：非晶态聚对苯二甲酸乙二酯拉伸样品中因形变引起的形变

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摘要

The combination of Fourier transform Raman spectroscopy and thermal analysis has been proved to be adequate for the study of the quantitative structural changes which take place in amorphous poly(ethylene terephthalate) on stretching. The two-phase conformational model previously proposed for annealed samples was applied to uniaxially stretched samples. The samples were deformed at different temperatures and speeds. Different conformer contents were found in the stretched sample depending on the stretching conditions. In general, deformation induces a conformational transition of gauche to trans. This behavior was lost at a narrow range of temperatures above the glass transition and at the lowest speeds, where the stretching seemed not to induce conformational changes. This different behavior has been associated to the high mobility of the polymer chains under these conditions, which imposes a different process of deformation marked by a high degree of chain slipping. This kind of deformation is present all along the sample and with the absence of necking in the uniaxial drawing process. (C) 1996 John Wiley & Sons, Inc. [References: 37]
机译：傅里叶变换拉曼光谱和热分析相结合已被证明足以研究无定形聚对苯二甲酸乙二酯在拉伸时发生的定量结构变化。先前提出的用于退火样品的两相构象模型被应用于单轴拉伸样品。样品在不同的温度和速度下变形。根据拉伸条件，在拉伸样品中发现不同的构象异构体含量。通常，变形引起薄纱构象向反式构象转变。这种行为在玻璃化转变温度以上的狭窄温度范围和最低速度下消失了，在最低速度下，拉伸似乎不会引起构象变化。在这些条件下，这种不同的行为与聚合物链的高迁移率有关，这导致以高度链滑动为特征的不同变形过程。这种变形在整个样品中都存在，并且在单轴拉伸过程中没有颈缩。 （C）1996 John Wiley＆Sons，Inc. [参考：37]

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