BTCA改性PEG/PVA相变储能纤维的结构与性能

摘要

将聚乙二醇(PEG)与聚乙烯醇(PVA)溶液混合,加入丁烷四羧酸(BTCA)作为交联剂配制纺丝原液,采用于法纺丝制得BTCA改性PEG/PVA相变储能纤维；研究了BTCA含量、热处理条件对交联程度的影响,并对纤维的结构、形态、储能性能及力学性能进行了分析.结果表明:在热处理温度为180℃,热处理时间为12 min时,纤维可达到良好的交联效果,纤维的交联程度随BTCA含量的增加呈上升趋势,BTCA质量分数为3％时达到平衡；改性纤维中PEG以独立微相区形式存在,而经热处理后可保留在交联网络中:热处理后的改性纤维力学性能随BTCA含量增加而提高,储能性能也增加且稳定；当BTCA质量分数为6％时,热处理后的纤维断裂强度达3.49 cN/dtex,再经沸水处理后纤维相变焓值可达23.01 J/g,PEG保留率达80％.%Polyethylene glycol (PEG) was mixed into polyvinyl alcohol (PVA) solution and was added with butane tetracarboxylic acid (BTCA) as a crosslinking agent to prepare a spinning solution which was produced into BTCA-modified phase change energy storage PEG/PVA fiber by dry spinning process.The effects of BTCA content and heat treatment conditions on the crosslinking degree were studied.The structure,morphology,energy storage performance and mechanical properties of the fiber were analyzed.The results showed that the fairly good crosslinking effect can be obtained while heating at 180 ℃ for 12 min; the crosslinking degree of the fiber appeared an upward tendency with the increase of BTCA content and achieved equilibrium at 3％BTCA by mass fraction; PEG existed in the modified fiber as many independent micro-phase regions,but remained in the crosslinking network after heat treatment; the mechanical properties of the modified fiber were improved with the increase of BTCA content after heat treatment,and the energy storage performance was also improved and remained stable; the fiber had the breaking strength of 3.49 cN/dtex after heat treatment and the phase change enthalpy value of 23.01 J/g and PEG retention rate of 80％ after boiling water treatment when the mass fraction of BTCA was 6％.