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首页> 外文期刊>Journal of Applied Polymer Science >SHRINKAGE OF SHORT PP AND PAN FIBERS UNDER HOT-STAGE MICROSCOPE
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SHRINKAGE OF SHORT PP AND PAN FIBERS UNDER HOT-STAGE MICROSCOPE

机译：热阶段显微镜下PP和PAN短纤维的收缩

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摘要

Marked shrinkage behavior when heated is typical of semicrystalline polymer fibers such as polypropylene (PP) and polyacrylonitrile (PAN). Shrinkage of PP and PAN fibers may give the possibility to control the spalling tendency of fiber concrete under the heat exposure of fire. Cut staple fibers are normally delivered for concrete reinforcement. Modern methods for continuous fibers cannot be used by the end-user for shrinkage determination of commercial staple fiber grades. The shrinkage of five different commercial staple fibers specially designed for concrete reinforcement was studied under a hot-stage microscope. Significant differences in cumulative shrinkages of the various PP and PAN fibers were detected, shrinkages being 3-15% with PP fibers and 6-7% with PAN fibers at a temperature of 150-170 degrees C. At about 160-165 degrees C, PP fibers melt, whereas PAN fibers continue shrinking. Hot-stage microscopy provides a simple and a relatively accurate method for estimating thermal shrinkage of staple PP and PAN fibers, the deviations from measured average values remaining typically at 10-15%. (C) 1995 John Wiley and Sons, Inc. [References: 17]
机译：加热时明显的收缩行为是典型的半结晶聚合物纤维，例如聚丙烯（PP）和聚丙烯腈（PAN）。 PP和PAN纤维的收缩可能会控制在火热下纤维混凝土的剥落趋势。切断的短纤维通常用于混凝土加固。最终用户无法使用连续纤维的现代方法来确定商用短纤维等级的收缩率。在热台显微镜下研究了五种专门设计用于混凝土加固的商品短纤维的收缩率。检测到各种PP和PAN纤维的累积收缩率有显着差异，在150-170℃的温度下，PP纤维的收缩率为3-15％，PAN纤维的收缩率为6-7％。在约160-165℃， PP纤维熔化，而PAN纤维继续收缩。热台显微镜提供了一种简单且相对准确的方法来估算短纤维PP和PAN纤维的热收缩率，与测量平均值的偏差通常保持在10-15％。 （C）1995 John Wiley and Sons，Inc. [参考：17]

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