Rheological behavior during thermotropic gelation of polyacrylonitrile concentrated solutions

摘要：

Dynamic viscoelastic properties of polyaerylonitrile(PAN)/DMSO/H2O solutions with different H2O contents were studied as a function of temperature. These PAN solutions gradually became gel with decreasing temperature. The sol-gel transition took place at a critical gel temperature, at which the scaling law of G(ω)～G(ω)∝ω held, allowing an accurate determination of the critical gel temperature by means of the frequency independence of the loss tangent. The gel point of PAN solutions increases with increasing H2O content. The scaling exponent n (=0.86) at the gel point is confirmed to be universal for PAN gels, which is independent of temperature, suggesting the similarity of the fractal structure in the critical PAN gels.

关键词： polyacrylonitrile gel point thermotropic gelation rheological behavior

作者: MA Cai-xia(马彩霞) YAN Wei-xia(闫伟霞) ZHANG Li(张莉) QIN Zong-yi(秦宗益) PAN Ding(潘鼎)

作者单位: State Key Laboratory for Chemical Fibers Modification and Polymer Materials, Donghua University, Sha Research Centre for Analysis and Measurement, Donghua University, Shanghai 201620, China

会议类型: 国际会议

会议名称: 第九届全国流变学学术会议

会议地点: 长沙

会议语种:英文

页码: 122-125

在线出版日期: 2008-09-28（万方平台首次上网日期，不代表论文的发表时间）