A Study of Stress-Yielding Mechanism of Aged Atactic Polystyrene

Abstract

Abstract: The stess yielding mechanism of aged atactic polystyrene(α-PS) was studied by use of mechanical tension, differential scanning calorimetry(DSC) and solvent-swelling. The viewpoint of cohensional entaglement(CE) was empolyed to interpret the experimental results, which indicated that the stress yielding of aged α-PSwas the destruction of the CEformed during aging. CEwas a kind of ordered structure, which was formed by local parallel alignment of several segments of several nearest neighboring chains. Its interaction energy was so low that heating beyond theT_g region, mechanical drawing over the yield point and solvent swelling all could destroy it completely.

Key words: Atactic polystyrene, Stress yielding, Cohensional entanglement

CLC Number:

O631

TrendMD:

SONG Rui, ZHAO Jun, YANG Juan, LING-HU Xin, GAO Jin-Gui, FAN Qing-Rong . A Study of Stress-Yielding Mechanism of Aged Atactic Polystyrene[J]. Chem. J. Chinese Universities, 2001, 22(2): 303.

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A Study of Stress-Yielding Mechanism of Aged Atactic Polystyrene

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