高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (4): 637.

• 论文 • 上一篇    下一篇

马来酸酐-苯乙烯多组分单体熔融接枝聚丙烯的机理研究

李颖, 谢续明   

  1. 清华大学化工系高分子研究所, 教育部先进材料重点实验室, 聚合物成型装备国家工程研究中心, 北京 100084
  • 收稿日期:1999-03-30 出版日期:2000-04-24 发布日期:2000-04-24
  • 通讯作者: 谢续明(1962年出生),男,教授,主要从事高分子物理化学和聚合物新型材料的研究.
  • 基金资助:

    华南理工大学聚合物成型装备国家工程研究中心科学与技术基金(编号99-001)

Studies on Machanism of Free Radical Melt-Grafting of Multi-monomer System for Maleic Anhydride/Styrene onto Polypropylene

LI Ying, XIE Xu-Ming    

  1. Advanced Material Laborotory, Institute of Polymer Science & Engineering, Tsinghua University, Beijing 100084, China
  • Received:1999-03-30 Online:2000-04-24 Published:2000-04-24

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被引次数

181

摘要： 用单螺杆挤出机研究了马来酸酐(MAH)-苯乙烯(St)对聚丙烯(PP)的多组分单体自由基熔融接枝体系.研究结果表明,用St作共单体能够显著提高MAH的接枝率.讨论了St用量、引发剂用量对接枝反应的影响,发现当两种单体物质的量比约为1∶1时,接枝物的接枝率最高,熔体流动速率(MFR)也最大.通过对反应机理的探讨,认为St和MAH的相互作用或反应在接枝反应中起到了重要的作用.在自由基的作用下,St可与MAH反应生成St-MAH共聚物(SMA),该共聚物对PP的接枝可大幅度提高MAH的接枝率.当两种单体的物质的量比约为1∶1时,体系中的接枝反应主要以SMA对PP大分子自由基的接枝为主,因此接枝物的接枝率较高.当MAH单体用量多于St单体时,一部分MAH单体与St反应生成SMA,另一部分可直接与PP大分子自由基进行接枝反应;当St单体用量多于MAH单体时,除与MAH反应生成SMA之外的St单体可先与PP大分子自由基反应,并起到稳定PP自由基的作用,这时接枝物的MFR较小,亦即接枝物的MFR与体系中可进行接枝反应的活性种数目有关.

关键词: 聚丙烯, 熔融接枝, 马来酸酐, 苯乙烯

Abstract: In this paper, free radical melt-grafting of the multi monomer system for maleic anhydride(MAH)/styrene(St) onto polypropylene(PP) has been studied by means of a single screw extruder. The influences of St concentration and initiator concentration on the grafting reaction were investigated. It was shown that the addition of St as a co monomer could significantly enhance MAHgrafting level on PP. The maximum MAHgrafting degree was obtained when the molar ratio of MAHto St was approximately 1∶1, but the melt flow rate(MFR) of the grafted PPwas the highest at this ratio. It was proposed that the interaction and reaction between MAHand St monomers played an important role in the grafting reaction. St improved grafting reactivity of MAHor reacted with MAHto form St MAHcopolymer(SMA) before the two monomers grafted onto PP. Grafting of SMAgreatly improved the grafting degree of MAH. When molar ratio of MAHto St is 1∶1, main grafting reaction in the system is the grafting of SMAtoward PP, therefore, the grafting degree of the grafted PPis the highest. When the concentration of MAHis higher than that of St, some MAHmonomer reacts with St to form SMA, others can directly grafts onto PPmacroradicals. When the amount of St added is higher than that of MAH, part of St monomer may preferentially react with PPmacroradicals to form more stable styryl macroradicals, while others copolymerize with MAH, yielding SMA. MFRof the grafted PPis lower in this case. It is considered that MFRof the grafted PPis decided by concentration of free monomers, or, number of grafting reactive species. FTIRanalysis confirmed the above mechanism.

Key words: Polypropylene, Melt-grafting, Maleic anhydride, Styrene

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