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首页> 外文期刊>Journal of Applied Polymer Science >Tensile and Elastic Properties of Triblock Copolymer Based on Aramide End-Segments and Polyether Mid-Segments
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Tensile and Elastic Properties of Triblock Copolymer Based on Aramide End-Segments and Polyether Mid-Segments

机译：基于芳酰胺端段和聚醚中间段的三嵌段共聚物的拉伸和弹性性能

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摘要

The tensile and elastic behavior of triblock copolymers containing uniform aramide (T Phi B) hard end-segments (HS) and poly(tetramethylene oxide) (PTMO, M-n = 2900 g/mol) soft segments (SSs) was studied. The molecular weight of the copolymer was varied by changing the length of the soft mid-segment; by extending the PTMO2900 with terephthalate units, the SS length was increased from 2900 g/mol to 21,000 g/mol and concurrently the aramide concentration decreased from 18 to 3 wt %. The mechanical properties were investigated by means of tensile testing, stress relaxation (SR) experiments, and cyclic tensile set (TS) tests. The E-modulus Was found to increase with increasing aramide content. The low molecular weight copolymers were brittle whereas the high molecular weight copolymers displayed large fracture strain values. The transition from brittle to ductile seemed to Occur at a triblock copolymer molecular weight of 6600 g/mol. A strain-induced crystallization was observed at strains above 250%, and both the fracture strain and stress were found to be highly dependant on the molecular weight of the copolymer. Cyclic tensile experiments showed that the materials had low TS values up to the Strain hardening g point. On the other hand, the SR data at 10% strain seemed to be little dependant on the molecular weight. The higher molecular weight copolymers did not display lower SR values than their low molecular Weight counterparts. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 1780-1785, 2009
机译：研究了含有均匀芳族酰胺（T Phi B）硬链段（HS）和聚四氧化二丙烯（PTMO，M-n = 2900 g / mol）软链段（SSs）的三嵌段共聚物的拉伸和弹性行为。共聚物的分子量通过改变软中间链段的长度而变化。通过用对苯二甲酸酯单元扩展PTMO2900，SS长度从2900 g / mol增加到21,000 g / mol，同时芳酰胺浓度从18 wt％降低到3 wt％。通过拉伸测试，应力松弛（SR）实验和循环拉伸变形（TS）测试研究了机械性能。发现E模量随着芳族聚酰胺含量的增加而增加。低分子量共聚物是脆性的，而高分子量共聚物表现出较大的断裂应变值。在三嵌段共聚物分子量为6600 g / mol时似乎发生了从脆性到延性的转变。在高于250％的应变下观察到应变诱导的结晶，并且发现断裂应变和应力都高度依赖于共聚物的分子量。循环拉伸实验表明，材料的低TS值高达应变硬化g点。另一方面，应变为10％时的SR数据似乎与分子量几乎没有关系。较高分子量的共聚物没有显示出比其低分子量对应物更低的SR值。 （C）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：1780-1785，2009

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