王艳菲,宁炜,张若愚,莫高明,陈友汜,欧阳琴
WANG Yan-fei,NING Wei,ZHANG Ruo-yu,MO Gao-ming,CHEN You-si,OUYANG Qin

• 1:中国科学院宁波材料技术与工程研究所碳纤维制备技术国家工程实验室
• 2:宁波大学材料科学与化学工程学院
• 3:赛默飞世尔科技(中国)有限公司

摘要(Abstract)：

丙烯腈(AN)和衣康酸(IA)经自由基溶液聚合合成相对分子质量中等的聚丙烯腈(PAN)共聚物,用流变学方法研究了温度对PAN-DMSO-H2O三元体系凝胶化过程的影响,以及三元体系储能模量G′、损耗模量G″等流变特性在凝胶化过程中的变化,得出不同温度下该体系的凝胶化转变与时间的变化规律。结果表明:温度越低,凝胶化转变所需时间越短。此外,还发现凝胶成形是逐渐变化的过程,凝胶点之后,网络结构仍继续生长形成更致密的结构。
Polyacrylonitrile(PAN) co-polymer with moderate molecular weight was prepared by free radicalsolution polymerization using acrylonitrile(AN) and itaconic acid(IA). The effect of temperature on the gela-tion process of PAN-DMSO-H2 O ternary system was studied with rheological methods. The evolution of rhe-ological parameters(storage modulus G′, loss modulus G″ etc.) of the ternary system during the gelationwere observed, and the law of gelation time at different temperatures were obtained. The result showed thatat lower temperatures, the gel formed in shorter time, and the gelation process continued coarsening afterthe critical gelation point.

关键词(KeyWords)： 聚丙烯腈;凝胶化行为;流变;网络结构
polyacrylonitrile,gelation behavior,rheology,network structure

Abstract:

Keywords:

基金项目(Foundation): 国家自然基金青年科学基金项目(批准号21204096)

作者(Author): 王艳菲,宁炜,张若愚,莫高明,陈友汜,欧阳琴
WANG Yan-fei,NING Wei,ZHANG Ruo-yu,MO Gao-ming,CHEN You-si,OUYANG Qin

DOI: 10.16090/j.cnki.hcxw.2014.05.001

参考文献(References)：

• [1]Wu Q Y,Chen X N,Wan L S,et al.Interactions between polyacrylonitrile and solvents:density functional theory study and two-dimensional infrared correlation analysis[J].Journal of Physical Chemistry B,2012,116(28):8 321-8 330.
• [2]Tan L,D Pan,N Pan.Gelation behavior of polyacrylonitrile solution in relation to aging process and gel concentration[J].Polymer,2008,49(26):5 676-5 682.
• [3]Bisschops J.Gelation of concentrated polyacrylonitrile solutions[J].Journal of Polymer Science,1955,17(83):89-98.
• [4]Flodin P.Chemically and physical crosslinked porous gels[J].Makromolekulare Chemie,Macromolecular Symposia,1988,17(1):213-220.
• [5]Richter S.Recent gelation studies on irreversible and reversible systems with dynamic light scattering and rheology-A concise summary[J].Macromolecular Chemistry and Physics,2007,208(14):1 495-1 502.
• [6]Labudzin A,A Ziabicki.Effect of composition and gelation conditions on structural changes accompanying gelation of PAN,PVA and gelatin solutions[J].Kolloid-Zeitschrift and Zeitschrift Fur Polymere,1971,243(1):21-27.
• [7]Nijenhuis K T,H H Winter.Mechanical-properties at the gel point of a crystallizing polyvinyl-Chloride)solution[J].Macromolecules,1989,22(1):411-414.
• [8]Zhao Y,Cao Y,Yang Y,et al.Rheological study of the sol-gel transition of hybrid gels[J].Macromolecules,2003,36(3):855-859.
• [9]Shibayama M,M Tsujimoto,F Ikkai.Static inhomogeneities in physical gels:comparison of temperature-induced and concentration-induced sol-gel transition[J].Macromolecules,2000,33(21):7 868-7 876.
• [10]Ikkai F,M Shibayama.Gel-size dependence of temperature-induced microphase separation in weakly-charged polymer gels[J].Polymer,2007,48(8):2 387-2 394.
• [11]Eleya M M O,S Ko,S Gunasekaran.Scaling and fractal analysis of viscoelastic properties of heat-induced protein gels[J].Food Hydrocolloids,2004,18(2):315-323.
• [12]Chambon F,H H Winter.Linear viscoelasticity at the gel point of a cross-linking pdms with imbalanced stoichiometry[J].Journal of Rheolo-
• [13]Boudhani H,Laine C,Fulchiron R,et al.Rheology and gelation kinetics of PVC plastisols[J].Rheologica Acta,2007,46(6):825-838.
• [14]Madbouly S A,Y Xia,M R Kessler.Rheological behavior of environmentally friendly castor oil-based waterborne polyurethane dispersions[J].Macromolecules,2013,46(11):4 606-4 616.
• [15]Chambon F,Petrovic Z S,Macknight W J,et al.Rheology of model polyurethanes at the gel point[J].Macromolecules,1986,19(8):2 146-2 149.
• [16]Muller R,Gerard E,Dugand P,et al.Rheological characterization of the gel point:A New Interpretation[J].Macromolecules,1991,24(6):1 321-1 326.
• [17]Chambon F,H H Winter.Stopping of crosslinking reaction in a pdms polymer at the gel point[J].Polymer Bulletin,1985,13(6):499-503.