超拉伸UHMWPE纤维的超分子结构变化  

SUPER MOLECULAR STRUCTURE CHANGEING OF UHMWPE FIBERS DURING ULTRA-DRAWING PROCESS

作　　者：于俊荣[1] 胡祖明[1] 刘兆峰[1] 

机构地区：[1]东华大学纤维材料改性国家重点实验室,上海200051

出　　处：《高分子材料科学与工程》2005年第4期260-263,共4页Polymer Materials Science & Engineering

基　　金：上海市青年科技启明星计划项目(03QF14001);上海高校优秀青年教师后备人选科研资助项目

摘　　要：用WAXD、DSC、SAXS及拉曼光谱等测试手段,研究了拉伸过程中UHMWPE纤维的超分子结构变化。结果表明,随拉伸的进行,纤维非晶区中分子链逐渐参与了结晶,超分子结构逐渐变得紧密规整,其SAXS强度逐渐减弱;纤维结晶度及熔融峰温随拉伸倍数的增加而增大,并逐渐趋于平衡,高倍拉伸后纤维WAXD结晶度为67.5%,DSC结晶度为96.1%,熔点为155.4℃;纤维横向晶粒平均尺寸随拉伸倍数的增加而变小,并逐渐趋于平衡,而纤维轴向晶粒尺寸随拉伸倍数的增加而变大,高倍拉伸后纤维结晶长周期为50nm左右。The super molecular structure of UHMWPE fibers changes with the increasing draw ratio, which are measured by WAXD, DSC, SAXS and Raman spectroscopy. The results show that UHMWPE molecules from amorphous region gradually participate in crystal lattice during drawing process, the super molecular structure of UHMWPE fibers becomes dense and regular, the SAXS intensity of fibers gradually becomes weak. The crystallinity and melting temperature of fibers increase and tend to become equilibrium with the increasing draw ratio, after ultra-drawn, the crystallinity measured by WAXD and DSC is up to (67.5%) and (96.1%) respectively, the melting point is about (155.4) ℃. During drawing process, the traversal average crystal size decreases and tend to become equilibrium, while the axial crystal size increases with the increasing draw ratio, after ultra-drawn, the crystallization long period is up to 50 nm or so.

关 键 词：UHMWPE纤维 超拉伸 超分子结构 结晶 

分 类 号：O631.13[理学—高分子化学]