凝固浴牵伸对微纳层叠带状PAN原丝性能的影响  

Effects of Draw Ratio in Coagulation Bath on the Properties of Micro-Nano Laminated Ribbon-Shaped PAN Precursors

作　　者：缪顺福 谭晶[1,2] 赵儒硕 杨卫民 程礼盛[1,2] 魏鹤琳 MIAO Shunfu;TAN Jing;ZHAO Rushuo;YANG Weimin;CHENG Lisheng;WEI Helin(School of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;State Key Laboratory of Organic-Inorganic Composites,Beijing 100029,China)

机构地区：[1]北京化工大学,机电工程学院,北京100029 [2]有机无机复合材料国家重点实验室,北京100029

出　　处：《塑料》2024年第2期84-88,共5页Plastics

基　　金：国家自然科学基金面上项目(52073012)。

摘　　要：采用新型微纳层叠挤出技术制备了层叠带状聚丙烯腈(PAN)碳纤维原丝,利用扫描电子显微镜、X射线衍射仪、万能材料试验机和差示扫描量热仪对原丝的性能进行表征,研究了不同凝固浴牵伸倍数对微纳层叠带状PAN原丝截面形态、结晶性能、力学性能以及热行为的影响。研究结果表明,随着凝固浴牵伸倍数的提高,层叠带状PAN原丝的厚度显著减小,线密度显著降低;层叠带状PAN原丝的结晶度和拉伸强度随着牵伸倍数的提高呈现先增加后减小的趋势,凝固浴牵伸倍数为5.5倍时,获得的层叠带状PAN原丝的性能较好。当凝固浴牵伸倍数从5.5倍增加至6.5倍时,原丝的拉伸强度由26.08 MPa降低至23.36 MPa。实验结果表明,凝固浴牵伸倍数为5.5倍下制备的层叠带状PAN原丝具有较好的综合性能,其结晶度为39.1%,拉伸强度和拉伸模量分别为26.08及661 MPa。The micro-nano laminated ribbon-shaped polyacrylonitrile(PAN)precursors were prepared by new micronano laminated extrusion technology,and the performance of the precursors were characterized by scanning electron microscope,X-ray powder diffraction(XRD),electrical testing machine,and differential scanning calorimeter(DSC).The effects of different draw ratios of coagulation bath on the cross-sectional morphology,crystallization properties and mechanical properties of micro-nano laminated ribbon-shaped PAN precursors were studied.The results showed that with the increase of the draw ratio of the coagulation bath,the thickness of the cascaded ribbon-shaped PAN precursors is greatly reduced;the crystallinity and tensile strength of the precursors showed a trend of first increasing and then decreasing with the increase of the stretch ratio,the best performance of the laminated ribbon-shaped PAN precursors were obtained at a coagulation bath draw ratio of 5.5.The tensile strength of the precursors decreased from 26.08 MPa to 23.36 MPa when the coagulation bath draw ratio was increased from 5.5 to 6.5 times.The experimental results showed that the laminated ribbonshaped PAN precursors prepared at a coagulation bath draw ratio of 5.5 had a good overall performance with a crystallinity of 39.1%and tensile strength and modulus of 26.08 MPa and 661 MPa respectively.

关 键 词：微纳层叠 聚丙烯腈 带状碳纤维原丝 凝固浴牵伸 力学性能 

分 类 号：TQ342[化学工程—化纤工业]