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首页> 外文期刊>Journal of Applied Polymer Science >Effect of tensile rates on thermal and mechanical properties of porous PTFE composites
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Effect of tensile rates on thermal and mechanical properties of porous PTFE composites

机译：拉伸速率对多孔PTFE复合材料热和力学性能的影响

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摘要

To achieve polymer-matrix composites for sealing materials with thermostability and toughness, PTFE composites filled with short glass fibers (SGFs) were hyperthermal stretched to prepare a substrate material with high thermal stability and porosity. The effects of various tensile rates on the thermal and mechanical properties and morphologies were investigated. The results revealed that the thermal stability could be improved slightly and the thermal expansion coefficient of composites increased by the tensile rate. Through observing the morphologies, tensile process produced cavities and the increased tensile rate had negligible effects on porosity, which also could be proved by density test. From mechanical properties analysis, stretched composites exhibited that the tensile strength increases first and then decreases with the increased tensile rate. Although the variation tendency of Young's modulus is similar to that of tensile strength, which is smaller than that of unstretched composite. When the tensile rate reached 50 mm center dot min(-1), the tensile strength and Young's modulus of the stretched composites increased by 65 and 9% to maximum, respectively. Meanwhile, elongation at break and shore hardness decreased. The thermal and mechanical properties improvement could be ascribed to the strain-induced crystallization and crystal alignment. In addition, the interplanar spacing and grain size were inversely proportional to the tensile rate. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48175.
机译：为了实现聚合物基复合材料，用于密封与热稳定性和韧性的材料，PTFE复合材料填充有短切玻璃纤维（SGFs）的超高温拉伸至具有高的热稳定性和多孔性制备的基板材料。上的热和机械性能和形态的各种拉伸速率的影响。结果表明，热稳定性可略有改善和复合材料的热膨胀系数增加拉伸速率。通过观察形态，拉伸过程中产生的空腔和所述增加的拉伸速率对孔隙度，其也可以通过密度试验证明的影响可以忽略。从机械性能分析，拉伸的复合材料表现出的拉伸强度增加，然后再与所述增加的拉伸率降低。尽管杨氏模量的变化趋势是类似的拉伸强度，其比未拉伸的复合材料的小。当拉伸率达到50毫米中央点分钟（-1）时，拉伸强度和拉伸的复合材料的杨氏模量分别增加了65％和9％到最大。同时，断裂和肖氏硬度伸长率下降。的热和机械性能的改善可以归因于应变诱导结晶和结晶取向。此外，晶面间距和晶粒尺寸是成反比的拉伸速率。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019年，136，48175。

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