后加工中热处理张力变化对高模低收缩涤纶工业丝结构与性能影响  

Influence of heat-treatment tension in post-processing on structural properties of high modulus low shrinkage industrial polyester fibers

作　　者：陈康 陈高峰 王群 王刚 张玉梅[2] 王华平[2] CHEN Kang;CHEN Gaofeng;WANG Qun;WANG Gang;ZHANG Yumei;WANG Huaping(State-Locality Joint Engineering Laboratory of Textile Fiber Materials&Processing Technology,Zhejiang Sci-Tech University,Hangzhou,Zhejiang 310018,China;State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai 201620,China;Zhejiang Unifull Industrial Fiber Co.,Ltd.,Huzhou,Zhejiang 313017,China)

机构地区：[1]浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室,浙江杭州310018 [2]东华大学纤维材料改性国家重点实验室,上海201620 [3]浙江尤夫高新纤维股份有限公司,浙江湖州313017

出　　处：《纺织学报》2022年第10期10-15,23,共7页Journal of Textile Research

基　　金：国家重点研发计划项目(2016YFB0303004);中国纺织工业联合会科技指导性项目(2021003)。

摘　　要：针对后加工热处理过程中高模低收缩型(HMLS)涤纶工业丝受热引起性能变化的问题,分别将HMLS涤纶工业丝置于150℃不同预加张力(0~0.10 cN/dtex)条件下热处理5 min,分析热处理前后样品的构象变化,阐明其性能调控的结构因素。结果表明:随着预加张力的减小,HMLS涤纶工业丝的断裂强度略有减小,初始模量和5%形变下的断裂强度明显降低,而断裂伸长率明显增大;热处理主要影响非晶区的结构变化,导致HMLS涤纶工业丝的非晶区取向变低、反式构象含量变小、片晶长周期变小以及非晶区厚度变小;可通过施加一定的预加张力有效抵消HMLS涤纶工业丝在后加工中受热时的收缩应力,从而降低非晶区分子链的运动能力,使得力学性能及非晶区结构变化幅度减小。This research investigates the influence of heat-treatment tension on structural properties of high modulus low shrinkage(HMLS)industrial polyester fibers in post-processing.HMLS industrial polyester fibers was subjected to heat treatment with various tensions(0-0.10 cN/dtex)at 150℃for 5 min.The conformational changes of the samples before and after the heat treatment were analyzed,and the structural factors regulating their properties were discussed.The results show that with the decrease of pre-tension,the breaking strength remains basically unchanged,the tenacity decreases slightly,the initial modulus and the tenacity at the specific elongation of 5.0%decreased obviously,and ultimate elongation increased significantly.The microstructure changes caused by the heat-treatment mainly occur in the amorphous chains,causing lower orientation in the amorphous region,lower trans conformation content,smaller lamellar long period and smaller amorphous thickness.The presence of pre-tension can effectively offset the shrinkage stress of the fiber,decreasing the mobility of molecular chains in the amorphous region,and the degree of mechanical properties and structure changes in the amorphous region is reduced.

关 键 词：高模低收缩型涤纶工业丝 热处理 热处理张力 微观结构 力学性能 

分 类 号：TQ341.5[化学工程—化纤工业]