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Analyses of Pultruded Polyester/ E-Glass Composites Subjected to Environmental Degradation

机译：降解聚酯/电子玻璃复合材料的环境降解分析

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摘要

This paper evaluates the response of experimental mold releases for a pultruded glass fiber reinforced polymer (GFRP). The initial assessment criteria include comparisons between pull forces and surface appearances for each mold release. Composites fabricated using experimental mold releases that exhibited acceptable properties for both were used for further mechanical characterization that included environmental aging for two different exposure lengths (500 hours and 1000 hours) in five different environments: UV, bleach, hydrochloric acid, distilled water at 125°F, and room temperature salt water. Three-point flexural bending and short beam strength tests were undertaken to determine the effects these environments would have on the composite when compared with the strengths of an unaged sample. This principally will determine how well the matrix is able to distribute the load to the stronger fibers after undergoing environmental degradation. This study found that the bleach environment had the most damaging effects for both flexural and short beam strengths. Notable increases in both flexural and short beam strength were seen for UV, elevated temperature distilled water, and salt water exposures which indicates the poor bonding between the fiber and the matrix material and possible secondary curing of the composite. Additional DMA and TGA tests were completed on unaged specimens to determine the glass transition temperature and onset temperature values. The mechanical properties for the experimental and commercially available mold releases did not vary significantly and suggests a closeness in chemical composition.
机译：本文评估了拉挤玻璃纤维增​​强聚合物（GFRP）的实验脱模响应。初始评估标准包括每种脱模剂的拉力和表面外观之间的比较。使用对两种模件均表现出可接受性能的实验脱模剂制成的复合材料可用于进一步的机械表征，包括在五个不同环境中的两种不同曝光时间（500小时和1000小时）的环境老化：UV，漂白剂，盐酸，125℃的蒸馏水°F，和室温盐水。进行了三点弯曲弯曲和短梁强度测试，以确定与未老化样品的强度相比，这些环境对复合材料的影响。原则上，这将确定在经历环境退化后，基质将负载分配到强度更高的纤维的能力如何。这项研究发现，漂白环境对弯曲强度和短光束强度都具有最大的破坏作用。对于紫外线，高温蒸馏水和盐水暴露，可观察到弯曲强度和短光束强度均显着增加，这表明纤维与基体材料之间的粘合性较差，并且复合材料可能进行二次固化。在未老化的样品上完成了其他的DMA和TGA测试，以确定玻璃化转变温度和起始温度值。实验和市售脱模剂的机械性能没有显着变化，表明化学成分接近。

著录项

  • 作者

    Bosley, Cameron.;

  • 作者单位

    The University of Mississippi.;

  • 授予单位 The University of Mississippi.;
  • 学科 Engineering.
  • 学位 M.S.
  • 年度 2017
  • 页码 86 p.
  • 总页数 86
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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