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以聚乙烯蜡(PE蜡,PEW)为基材,接枝马来酸酐(顺丁烯二酸酐,MAH)反应,采用正交试验方法设计配方。对单体用量、引发剂用量、反应温度及加料方式等影响接枝反应的因素进行研究,测试了试样的接枝率、吸水率、凝胶率、接触角、熔融指数及热性能数据。再用红外光谱(IR)和X射线衍射(XRD)进行微观结构表征,并与未接枝以及外购接枝的样品进行性能比较。试验结果表明:当PEW/MAH/BPO=100/8/3,温度80℃下可制得接枝率为0.9%的PEW-g-MAH。测得其熔融指数0.128g/10min,吸水率2.663 3%,凝胶率69.91%。通过正交试验分析发现因素影响次序为A(MAH)>B(BPO)>C(反应温度T)>D(加料方式)。与外购PEW-g-MAH性能相近的是7#配方,配比为PEW/MAH/BPO=100/10/3。其接枝率为0.7%,熔融指数为0.17g/10min,吸水率为2.031 5%,凝胶率为63.87%。
Polyethylene wax (PE wax, PEW) as the base material, grafted maleic anhydride (maleic anhydride, MAH) reaction, the orthogonal test method design formula. The factors affecting the grafting reaction, such as the amount of monomer, the amount of initiator, the reaction temperature and the feeding method were studied. The grafting rate, water absorption, gel fraction, contact angle, melt index and thermal performance data were tested. The microstructure was characterized by IR and XRD, and compared with the non-grafted and purchased grafted samples. The results showed that the PEW-g-MAH with the grafting ratio of 0.9% could be obtained at a temperature of 80 ℃ when PEW / MAH / BPO = 100/8/3. The melt index was measured 0.128g / 10min, water absorption 2.663 3%, the gel rate of 69.91%. Through the orthogonal experiment, it is found that the order of the factors is A (MAH)> B (BPO)> C (reaction temperature T)> D (feeding method). Similar to the purchased PEW-g-MAH performance is the 7 # formula, the ratio of PEW / MAH / BPO = 100/10/3. The grafting rate was 0.7%, the melt index was 0.17g / 10min, the water absorption was 2.031 5% and the gel fraction was 63.87%.