PCT纤维耐酸特性试验研究

doi:10.12068/j.issn.1005-3026.2023.06.014

摘要/Abstract

摘要： 针对酸溶液处理对聚对苯二甲酸1，4-环己烷二甲醇酯(PCT)纤维的影响，使用扫描电子显微镜(SEM)、单纤维强力机、同步热分析仪(STA)、傅里叶变换红外光谱仪等对硫酸和硝酸处理前后PCT纤维的表面形貌、力学性能、老化反应活化能、红外光谱进行了测试和分析.结果表明:酸液浸泡处理会造成PCT纤维发生收缩，导致纤维表面腐蚀出现凹痕和裂纹；水分子进入纤维大分子间隙造成断裂强力和断裂伸长率同步下降；PCT纤维的断裂强力随酸质量分数的增加、处理时间的延长和处理温度的提高而降低；除非处于质量分数和温度较低的情况下，PCT纤维的耐硫酸能力好于硝酸；PCT纤维耐硫酸性能弱于聚苯硫醚(PPS)、聚四氟乙烯(PTFE)纤维，好于聚酰亚胺(PI)、芳纶1313纤维；酸溶液处理造成PCT纤维老化反应活化能降低，分子稳定性下降.

关键词: PCT；耐酸特性；力学特性；活化能；红外光谱

Abstract: To understand the effect of acid solution treatment on poly 1，4-cyclohexylen dimethylene terephthalate(PCT) fiber， the surface morphology， mechanical properties， aging reaction activation energy and infrared spectrum of PCT fibers before and after sulfuric acid and nitric acid treatment were tested and analyzed by scanning electron microscope(SEM)， single fiber strength machine， synchronous thermal analyzer(STA) and Fourier transform infrared spectrometer(FTIR). The results show that the acid immersion treatment can cause the shrinkage of PCT fiber， leading to the surface corrosion of the fibers and the occurrence of dents and cracks; The entering of water molecules into the fiber macromolecule gap of PCT fiber causes a simultaneous decrease in breaking strength and elongation at break; The breaking strength of PCT fiber decreased with the increase of acid solution concentration， treatment time and treatment temperature; Unless at a lower concentration and temperature， the sulfuric acid resistance of PCT fiber is better than that of nitric acid; The sulfuric acid resistance of PCT fiber is weaker than that of the polyphenylene sulfide(PPS) and the polytetrafluoroethylene(PTFE) fiber， and better than that of the polyimide(PI) and the Aramid 1313 fiber; Acid solution treatment can lead to a decrease in the activation energy of the aging reaction and molecular stability of PCT fiber.

Key words: PCT； acid resistance； mechanical properties； activation energy； infrared spectrum

中图分类号:

X932

常德强，陈蕾，毛宁，柳静献. PCT纤维耐酸特性试验研究[J]. 东北大学学报（自然科学版）, 2023, 44(6): 863-870.

CHANG De-qiang， CHEN Lei， MAO Ning， LIU Jing-xian. Experimental Study on Acid Resistance of PCT Fiber[J]. Journal of Northeastern University(Natural Science), 2023, 44(6): 863-870.

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