凝固浴中物质极性对PAN结晶度的影响  

Effect of Substance Polarity in Coagulation Bath on PAN Crystallinity

作　　者：朱镇[1] 袁俊崧[1] 肖阳[1] 王蔚[1] 徐樑华[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《高分子通报》2013年第2期51-55,共5页Polymer Bulletin

基　　金：国家科技部973项目(2011CB605602)

摘　　要：采用恒温加热和双扩散两种脱除溶剂的方式制备PAN大分子薄膜,运用X射线衍射仪、傅里叶红外、紫外分光光度计等进行表征,研究凝固浴中沉淀剂极性对PAN大分子结晶度的影响。结果表明在凝固相分离过程中,沉淀剂对PAN大分子结晶度的影响是通过与氰基发生亲和作用实现的。沉淀剂极性越大,与PAN大分子之间亲合作用越强,对分子链的束缚越明显,使PAN分子调节自身构象变得困难,阻碍结晶的生长。电解质的加入能够弱化这种亲合作用,提高PAN的结晶度。PAN films were prepared by either isothermal heating or double diffusion to expel the solvent in the polymer solution. We used X-ray diffraction, FT-IR, UV spectrometer to investigate the effect of the polarity of the precipitant on the crystallization of PAN in the solutions. The results show that in the process of solidification, the effect of precipitant on PAN crystallization is achieved by the close association between precipitant and cyanogroup. The stronger polarity precipitants hold, the stronger association they form. Therefore, polymer chains are restricted more tightly to block the crystallization of PAN polymers. Addition of electrolyte can help to weaken the association and to improve PAN crystallinity.

关 键 词：PAN薄膜 结晶度 极性 脱溶剂 

分 类 号：O632.12[理学—高分子化学]