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Double Yielding in Deformation of Semicrystalline Polymers
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-09-13 , DOI: 10.1002/macp.202000151
Masoud Razavi 1 , Shi‐Qing Wang 1
Affiliation  

Different semicrystalline polymers including poly(l‐lactic acid), poly(ethylene terephthalate), syndiotactic polystyrene, and polyamide 12 are studied in terms of their mechanical response to uniaxial compression deformation. Apparent decoupling of yielding of amorphous and crystalline phases is identified as separate peaks in the stress–strain curve in the vicinity of the glass transition temperature. The same feature is also observed for the uniaxial extension of predrawn semicrystalline poly(ethylene terephthalate). It is indicated that in absence of a strong amorphous phase a semicrystalline polymer is unable to yield and undergo plastic deformation and it fails in a brittle manner in the uniaxial compression. Treating a semicrystalline polymer as a composite of amorphous and crystalline phases, putting emphasis on the crucial role of amorphous phase in acting as connectors between crystalline domains and indicating that the yielding of amorphous phase is a prerequisite for yielding of crystalline phase, work toward a better understanding of the mechanical properties of semicrystalline polymers at the molecular level is done.

中文翻译:

半结晶聚合物变形的双屈服

不同的半结晶聚合物,包括聚(l-乳酸),聚对苯二甲酸乙二醇酯,间同立构聚苯乙烯和聚酰胺12对单轴压缩变形的机械响应进行了研究。非晶相和结晶相的屈服的表观解耦被确定为玻璃化转变温度附近应力-应变曲线中的单独峰。预拉伸的半结晶聚对苯二甲酸乙二醇酯的单轴延伸也观察到相同的特征。已表明,在不存在强非晶相的情况下,半结晶聚合物不能屈服并发生塑性变形,并且在单轴压缩中以脆性方式破坏。将半结晶聚合物视为非晶相和结晶相的复合物,
更新日期:2020-10-05
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