Effect of orientation on the mechanism of plastic yielding of poly(ethylene terephthalate) in adsorption-active media

详细信息    查看全文

• 作者：A. V. Efimov (1)
  S. L. Bazhenov (2)
  I. V. Tyun’kin (2)
  A. L. Volynskii (1)
  N. F. Bakeev (2)
  
• 刊名：Polymer Science Series A
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：55
• 期：12
• 页码：721-728
• 全文大小：
• 作者单位：A. V. Efimov (1)
  S. L. Bazhenov (2)
  I. V. Tyun’kin (2)
  A. L. Volynskii (1)
  N. F. Bakeev (2)
  
  1. Faculty of Chemistry, Moscow State University, Moscow, 119991, Russia
  2. Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Sciences, Profsoyuznaya ul. 70, Moscow, 117393, Russia
  
• ISSN：1555-6107

文摘

The effect of the preliminary orientation on the formation of crazes in poly(ethylene terephthalate) during straining in adsorption-active liquids is studied. Poly(ethylene terephthalate) is oriented by drawing at a temperature of 80°C, which is somewhat higher than its glass-transition temperature (～75°C). After orientation, samples are tested in tension in organic liquids at room temperature. At low degrees of preliminary drawing, the shear yield stress during straining in air does not increase significantly. However, the stress of craze widening rises in proportion to the degree of preliminary drawing. Thus, the orientation suppresses crazing and leads to the transition to shear flow. A model is proposed to explain the effect of orientation on crazing. According to this model, craze widening and pulling of a nonoriented polymer into the craze volume result from the formation of pores in the bases of fibrils. The formation of fibrils is caused by straining of the polymer between pores.