Effect of AN/IA ratio on the structure and properties of Ultra-high Molecular Weight Polyacrylonitrile(UHMWPAN) Synthesized by Aqueous Suspension Polymerization
Ultra-high molecular weight polyacrylonitrile (UHMWPAN) powders were synthesized by aqueous suspension polymerization with different AN/IA ratios using α,α”-azobisisobutyronitrile (AIBN) as initiator and Polyvinylalcohol (PVA) as the disperser at 70℃ for 2h.The thermal properties,structural characteristics,element component analysis and aggregation structure studies of the UHMWPAN samples were measured by thermal analyzer,differential scanning calorimeter,fourier transform infrared spectrometer,element analyzer and X-ray diffractometer.The addition of IA was found to be favorable to retard the concentrated heat release and improve the carbon yield in the process of preoxidation of the precursor.The main absorption peaks corresponding to C≡N,C=O,-CH2-,-OH,and etc.were observed in FI-IR spectra of the copolymers.As the content of IA increased,the intensity of the absorption peak at 1735cm-1 corresponding to C=O increased;the content of oxygenium in the copolymer increased first and then leveled off;the former crystal structure of PAN was destroyed which meaned the decline of the degree of crystallinity and the decrease of the grain size.
UHMWPAN Aqueous suspension polymerization AN/IA ratio Structure and properties
Wei Wu Huiyu Jiang
School of Chemistry and Chemical Engineering,Wuhan Textile University,Hubei 430200,China
国内会议
2014全国高性能纤维及复合材料新技术应用与产业化推进研讨会
杭州
英文
69-80
2014-10-24（万方平台首次上网日期，不代表论文的发表时间）