聚乙烯的添加对马来酸酐接枝聚丙烯制备及性能的影响
吴航1，李春2，邱子跋1，赵世成1
1.上海市多相结构材料化学工程重点实验室，华东理工大学化工学院，上海 200237；
2.歌尔股份有限公司 SAC 事业群材料研发中心，山东潍坊 261031
Effect of Polyethylene Addition on the Preparation and Properties of Maleic Anhydride Grafted Polypropylene
Wu Hang1, Li Chun2, Qiu Ziba1, Zhao Shicheng1
1.Shanghai Key Laboratory of Chemical Engineering for Multiphase Structural Materials,East China University of Science and Technology,Shanghai 200237,China; 2.SAC BG Material Research Department,Goertek Co., Ltd., Weifang 261031,China
摘要：为提高反应挤出法制备的马来酸酐接枝聚丙烯(PP-g-MAH)的接枝率 ，降低熔体流动速率(MFR)并改善其色泽 ，笔者采用高温流变仪、差示扫描量热仪、力学性能测试等方法研究了 PP-g-MAH 制备过程中三种聚乙烯 (PE)的添加对产物接枝率 、颜色、流动性能、结晶性能以及应用性能的影响。研究表明 ，高密度聚乙烯(PE-HD)、低密度聚乙烯 (PE-LD) 和线性低密度聚乙烯(PE-LLD)的加入，均在一定程度上提高了马来酸酐的接枝率 ，其中 PE-HD 的效果最优 ，PE-LD 效果次之，PE-LLD 则有一定负面影响；同时 PE 的加入也能改善产品的颜色，且加入量越高 ，颜色越浅 ；在流动性能方面，PE-LD 的加入显著降低了产品的 MFR，另两种 PE 则使得 MFR 先上升后下降，三种 PE 均降低了接枝产物的复数黏度，其中 PE-HD 的效果最明显；在结晶性能上 ，添加不同 PE 都能够提高接枝物的结晶性能，加入量越高，对结晶过程的促进作用越明显，其中 PE-HD 的提升效果最佳 。 此外研究结果显示添加 PE-HD 能够抑制聚丙烯 β 晶的生成。应用研究结果表明，加入制备的 PP-g-MAH 能够明显改善玻璃纤维与聚丙烯基体的相容性，从而大幅提高聚丙烯复合体系的力学性能。
Abstract：In order to improve the grafting rate of maleic anhydride grafted polypropylene (PP-g-MAH) prepared by reactive extrusion, reduce the melt index (MFR) and improve its color, the effects of three kinds of polyethylene (PE) addition on the grafting rate, color, flow performance, crystallization performance and application performance of PP-g-MAH were studied by high temperature rheometer, differential scanning calorimetry and mechanical property test. The results show that the addition of high-density polyethylene (PE-HD), low-density polyethylene (PE-LD), and linear low-density polyethylene (PE-LLD) can all improve the grafting rate of maleic anhydride to a certain extent. Among them, PE-HD has the best result, followed by PE-LD, and PE-LLD has a certain negative impact; at the same time, the addition of PE can also improve the color of the product, and the higher the amount added, the lighter the color; in terms of flowability, the addition of PE-LD significantly reduces the MFR of the product, while the MFR of the other two types of PE first increase and then decrease. All three types of PE reduce the complex viscosity of the grafted product, with PE-HD having the most significant effect; in terms of crystallization performance, adding different types of polyethyl‐ ene can improve the crystallization performance of the graft copolymer. The higher the amount added, the more obvious the promoting effect on the crystallization process, with PE-LD having the best improvement effect. The application research results indicate that the addition of prepared PP-g-MAH can significantly improve the compatibility between glass fiber and polypropylene matrix, thereby significantly improving the mechanical properties of polypropylene composite systems.
关键词：聚丙烯；聚乙烯；熔融接枝；马来酸酐
Keywords：polypropylene; polyethylene; melt grafting; maleic anhydride
基金：国家自然科学基金项目(21878089)
本文引用格式：
吴航，李春，邱子跋，等.聚乙烯的添加对马来酸酐接枝聚丙烯制备及性能的影响[J].工程塑料应用，2023，51(8)：15-20，25.
Wu Hang，Li Chun，Qiu Ziba，et al. Effect of polyethylene addition on the preparation and properties of maleic anhydride grafted polypropyl‐ene[J]. Engineering Plastics Application，2023，51(8)：15-20，25.
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