Effects of uniaxial drawing on the performance and structure of filled polytetrafluoroethylene
Effects of uniaxial drawing on the performance and structure of filled polytetrafluoroethylene
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单轴拉伸对填充聚四氟乙烯性能和结构的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Zhen
中科院分区：
文献类型：
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作者：
Dongna Zhang;Kaichang Kou;P. Gao;Yu Zhang;Zhen
基于拉伸过程中的软化现象，对填充聚四氟乙烯（PTFE）复合材料进行了研究。将短玻璃纤维（SGFs）添加到PTFE中，在室温下以不同拉伸应变比单向拉伸。结果表明，取向过程中孔隙率和拉伸强度增加，硬度降低。拉伸软化为复合材料作为垫片材料提供了契机。压缩率和回弹率试验结果表明，随着拉拔比的增大，压缩率和回弹率均有所提高，当拉拔应变比达到80%时，回弹率是未拉拔时的近3倍。填充后的复合材料出现两种现象：一是SGFs从PTFE树脂上脱落；二是SGFs形成了细小的空隙和原纤维，给复合材料带来了独特的软化和高强度等性能。还发现晶体分裂成更小的，然后在张力的早期阶段重新排列。当拉伸率达到35%时，结晶度开始提高，开始形成原纤维。认为原纤维为不完全结晶，随着拉伸比的增大，原纤维逐渐生长，晶粒逐渐变小。变异较大。ENG。科学。[j] .中文信息学报，54(4):1427 - 1435,2014。©2013塑料工程师协会
Based on the phenomenon of softening under drawing, the filled polytetrafluoroethylene (PTFE) composites were studied. Short glass fibers (SGFs) were added into PTFE and drew at room temperature uniaxially in different draw strain ratios. As the result showed, porosity and tension strength increased, whereas the hardness decreased during orientation. Tensile softening provided an opportunity for taking the composite as gasket material. It could be detected from the tests of compressibility and recovery that both compressibility and resiliency were improved with the increasing draw ratio, and when draw strain ratio reached 80%, resiliency was nearly three times as the nondrawn one. There were two phenomena in the filled composite: first, SGFs were debonded from PTFE resin and second, small voids and fibrils were formed, which brought unique properties such as softening and high strength to the composite. It was also found that crystals divided into smaller ones and after that rearranged at an early stage of tension. When the draw ratio reached 35%, degree of crystallinity started to increase and fibrils began to be formed. It was believed that fibrils were imperfect crystal, and kept increasing the draw ratio, fibrils grew and crystalline grain became smaller gradually. POLYM. ENG. SCI., 54:1427–1435, 2014. © 2013 Society of Plastics Engineers