聚乙二醇-聚乙烯醇相变储能纤维的制备及其性能

以聚乙二醇(PEG)为相变物质,聚乙烯醇(PVA)为纤维基体,加入少量丁烷四羧酸(BTCA)作为交联剂,采用干法纺丝制备相变储能纤维,利用原位交联法在纤维拉伸热定形过程中使BTCA与PVA、PEG发生交联,将PEG接枝在PVA上。研究了BTCA、PEG合适的添加量以及最佳热定形温度对PEG保留率的影响,并通过差示扫描量热法、扫描电镜对纤维的热性能和形貌进行了分析。结果表明:当PEG添加量为30%(占PVA质量的百分数)、BTCA添加量为5%(占PVA质量的百分数)时,纤维充分交联,200℃下热处理10 min所得纤维PEG的保留率98%;制得的纤维的相变热焓可达34 J/g,拉伸强度可达3.26 cN/dtex;在升降温循环400次后仍具有良好的储能性。

Preparation and Charaterization of Polyethylene Glycol-Polyvinly Alcohol Thermal Regulating Fiber

Thermal regulating fibers were prepared by dry spinning,which were made from polyethylene gly-col(PEG) phase change material,polyvinyl alcohol(PVA)(fiber matrix) and small amounts of cross-linkingagent butane tetracarboxylic acid(BTCA).An in situ cross-linking method was employed to make the BTCAreacting with the PEG and PVA during the thermal treatment which led to the cross-linking between PVAand PEG.The amounts of BTCA and PEG were optimized and the influence of thermal treatment conditionson reservation ratio was investigated.The performance and morphology of the fibers were analyzed by DSCand SEM,respectively.Results showed that when the PEG was 30%(to the mass of PVA)and BTCA was 5%(to the mass of PVA),after the thermal treatment of 200 ℃ and 10 min,the obtained fiber had a high PEGgrafting ratio of>98%.The latent heat of the fiber was 34 J/g,the fiber's tensile strength was 3.26 c N/dtex,and the fibers still had good energy storage performance after 400 times of heating-cooling cycles.