硼酸改性对聚丙烯腈纤维预氧化的影响The Effect of Boric Acid Modification on Pre-Oxidation of Polyacrylonitrile Fiber
孙同庆,吕春祥,李永红,赵宇飞,隋敏,邵伟
SUN Tong-qing,Lü Chun-xiang,LI Yong-hong,ZHAO Yu-fei,SUI Min,SHAO Wei
摘要(Abstract)：
通过在线监测聚丙烯腈(PAN)纤维的热收缩应变和应力,研究了硼酸改性对PAN纤维预氧化的影响。试验结果表明:随着硼酸溶液浓度的增加,PAN纤维化学反应的起始和结束温度向高温方向移动,化学收缩量降低,预氧化纤维体密度逐渐降低,硼酸对PAN纤维化学反应有抑制作用;硼酸对分子内环化和分子间交联反应的抑制可有助于预氧化纤维均质化程度的提高,并可防止PAN纤维表面在较高温度下被过度氧化。
Through in-situ measuring the shrinkage strain and stress of polyacrylonitrile(PAN) fiber,the effects of boric acid on pre-oxidation of PAN fiber were studied.The results indicated that with the increasing of the concentratin of boric acid,the initial and end temperature of chemical reactions would move to high temperature,the chemical shrinkage would reduce and density of the oxidized fiber would decrease.Boric acid could inhibit chemicals reactions of PAN fiber during stabilization.However,the suppression on intramolecular cyclization and intermolecular crosslinking reaction of boric acid could help to improve the degree of homogenization of pre-oxidized fiber.And PAN fiber surface could be prevented from being excessively oxidized at the higher temperature.
关键词(KeyWords)：
聚丙烯腈纤维;硼酸;改性;应变;应力
polyacrylonitrile fiber;boric acid;modification;strain;stress
基金项目(Foundation): 山西省青年科技研究基金(2013021012-5)
作者(Author):
孙同庆,吕春祥,李永红,赵宇飞,隋敏,邵伟
SUN Tong-qing,Lü Chun-xiang,LI Yong-hong,ZHAO Yu-fei,SUI Min,SHAO Wei
DOI: 10.16090/j.cnki.hcxw.2016.06.008
参考文献(References)：
- [1]刘国昌,徐淑琼.聚丙烯腈基碳纤维及其应用[J].机械制造与自动化,2004,33(4):41-43.
- [2]李贺军.炭/炭复合材料[J].新型碳材料,2001,16(2):79-80.
- [3]CHAND S.Carbon fibers for composites[J].Journal of Materials Science,2000,35(6):1303-1313.
- [4]GUPTA A,Harrison I R.New aspects in the oxidative stabilization of PAN-based carbon fibersⅡ[J].Carbon,1997,35(6):809-818.
- [5]RAHAMAN M S A,ISMAIL A F,MUSTAFA A.A review of heat treatment on polyacrylonitrile fiber[J].Polymer Degradation and Stability,2007,92(8):1421-1432.
- [6]刘杰,李佳,王雷,等.预氧化过程中PAN纤维皮芯结构的变化[J].新型炭材料,2008,23(2):177-184.
- [7]LV M Y,GE H Y,CHEN J.Study on the chemical structure and skincore structure of polyacrylonitrile-based fibers during stabilization[J].Journal of Polymer Research,2009,16(5):513-517.
- [8]王延相,王成国,张旺玺,等.化学改性对PAN原丝及预氧纤维结构性能的影响[J].高分子材料科学与工程,18(6):145-148.
- [9]KO T H,HUANG L C.Preparation of high-performance carbon fibers from PAN fibers modified with cobaltous chloride[J].Journal of Materials Science,1992,27(9):2429-2436.
- [10]张旺玺,王艳芝,王延相,等.Ni2SO4改性对聚丙烯腈原丝及其碳纤维结构与性能的影响[J].高分子学报,2001(5):670-673.
- [11]WANG PH,LIU J,LI RY.Aspects on prestretching of PAN precursor:Shrinkage and thermal behavior[J].Journal of Applied Polymer Science,1998,67(7):1185-1190.
- [12]FITZER E,FROHS W,HEINE M.Optimization of stabilization and carbonization treatment of PAN fibres and structural characterization of the resulting carbon fibres[J].Carbon,1986,24(4):387-395.
- [13]刘杰,刘扬,梁节英.改性PAN共聚纤维在预氧化过程中的热应力应变[J].材料研究学报,2005,19(4):389-394.
- [14]闫实,成声月,刘朝辉,等.硼酸应用在耐高温涂层中的研究[J].当代化工,2015,44(2):227-230.
- [15]肖娜,徐三魁,彭进,等.硼酸改性酚醛树脂的制备与表征[J].化学世界,2010(9):538-540.
- [16]GUPTA A,HARRISON IR.New aspects in the oxidative stabilization of PAN-based carbon fibers[J].Carbon 1996,34(11):1427-1445.