SEBS-g-MAH对聚乙烯等温及非等温结晶动力学的影响Influence of SEBS-g-MAH on Isothermal and Non-Isothermal Crystallization Kinetics of LLDPE
熊煦,刘日鑫,龚方红
摘要(Abstract)：
利用差示扫描量热法结合Avrami方程研究了苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物接枝马来酸酐(SEBS-g-MAH)对线型低密度聚乙烯(LLDPE)等温及非等温结晶动力学的影响。结果表明,热塑性弹性体SEBS及其接枝物的加入阻碍了LLDPE分子链的规则排列,影响了链段在结晶扩散迁移规整排列的速度,使得结晶速率变慢,对LLDPE晶体生长起了抑制作用;LLDPE/SEBS-g-MAH共混体系的半结晶时间t1/2和结晶活化能E明显增大,Avrami指数n对结晶温度有依赖性,kn值随温度的升高而减小。通过Jeziorny法对非等温结晶过程进行处理,试样的Avrami指数n值均在1.1~1.5,表明LLDPE的结晶成核机理和生长方式没有改变。
关键词(KeyWords)： LLDPE;SEBS-g-MAH;差示扫描量热法;等温结晶动力学;非等温结晶动力学
基金项目(Foundation):
作者(Author): 熊煦,刘日鑫,龚方红
参考文献(References)：
- [1]LIU Sheng-peng(刘生鹏),ZHANG Miao(张苗),HU Hao-ze(胡昊泽).Development in modif ication of polyethylene(聚乙烯改性研究进展)[J].Journal of Wu Han Institute of Chemical Technology(武汉工程大学学报),2010,32(3):31-35.
- [2]YU Qiang(俞强),LIN Ming-de(林明德),ZHANGH Wei(张伟),et al.Melt grafting of MAH onto polyolefin elastomer(聚烯烃弹性体与马来酸酐的熔融接枝)[J].China Plastics Industry(塑料工业),2002,30(4):20-22.
- [3]GAO Guang-hui(高光辉),LI Wei-hua(李卫华),YAN De-yue(颜德岳).Investigation on crystallization kinetics of nylon1218(尼龙1218的等温及非等温及非等温结晶动力学的研究)[J].Acta Polymer Sinca(高分子学报),2004(4):465-470.
- [4]Avrami M.Kinetics of phase changes II:Transformation-time relations for random distribution of nuclei[J].Journal of Chemistyand Physics,1940,8(2):212-224.
- [5]Jiao C M,Wang Z Z,Liang X M,et al.Non-isothermal crystallization kinetics of silane crosslinked polyethylene[J].Polm Test,2005,24(1):71-80.
- [6]Cebe P,Hong S.Crystallization behavior of poly(ether-ether-ketone)[J].Polymer,1986,27(8):1183-1192.
- [7]YU J,HE J.Crystallization kinetics of maleic anhydride grafted polypropylene ionomers[J].Polymer.2000,41(3):891-898.
- [8]Grenier D,Prud homme R E.Avrami analysis 3 experimental limiting factors[J].J Polym Sci Phy Ed,1980,18(7):1655-1657.
- [9]DiLorenzo M L,Silvestre C.Non-isothermal crystallization of polymers[J].Prog Polym Sci,1999,24(6):917-950.
- [10]Gupta A K,Purwar S N.Crystallization of PP in PP/SEBS blend and its correlation with tensile properties[J].J Appl Polym Sci,1984,29(5):1595-1609.
- [11]CHEN Xiao-lei(陈晓蕾),SHAO Wei(邵玮),LI Chun-zhong(李春忠).Preparation and crystalline behavior of PET/ATOnanocomposites prepared by in-situ polymerization(原位聚合制备PET/ATO纳米复合材料及其结晶行为)[J].J Chem Eng ofChinese Univ(高校化学工程学报),2007,21(2):334-340.
- [12]SHI Heng-chong(石恒冲),LI Bin(李斌).Non-isothermal crystallization kinetics of HDPE/SEBS-g-MAH(马来酸酐接枝HDPE/SEBS非等温结晶动力学)[J].Polymer Materials Science And Engineering(高分子材料科学与工程),2008,24(4):121-124.
- [13]YU Jian(余坚),HE Jia-song(何嘉松).Non-isothermal crystallization behavior of maleic anhydride graft polypropylene and itsionomers(聚丙烯接枝马来酸酐及其离聚物的非等温结晶动力学)[J].Acta Polymer Sinca(高分子学报),1999(5):513-515.
- [14]Jeziorny A.Parameters characterizing the kinetics of the non-isothermal crystallization of poly(ethylene terephthalate)determinedby d.s.c.[J].Polymer,1978,19(10):1142-1144.