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用马来酸二丁酯(DBM)为接枝单体,过氧化二枯基(DCPO)为引发剂,对低密度聚乙烯(LDPE)进行了熔融接枝功能化。样品的红外光谱表明接枝反应确已发生。通过对样品中酯基的皂化水解测定产物的接枝率,对产物进行萃取,用凝胶量间接表征产物的交联程度;用溶液的特性粘度从侧面显示样品的支化或降解情况。实验结果表明,产物的接枝率和凝胶量可以通过选择反应条件(温度、时间及反应混合物的组成)来控制;过量的DCPO是引起交联产生凝胶的主要原因;向体系中添加DMF可阻止交联反应的发生,但产物的接枝率也有所下降,以自由基机理对上述结果进行了讨论。
The low density polyethylene (LDPE) was melt graft functionalized with dibutyl maleate (DBM) as grafting monomer and dicumyl peroxide (DCPO) as initiator. The infrared spectrum of the sample shows that the grafting reaction has indeed taken place. The product is extracted by saponification hydrolysis of the ester groups in the sample, the product is extracted, the degree of crosslinking of the product is indirectly characterized by the amount of gel, and the branching or degradation of the sample is shown laterally using the intrinsic viscosity of the solution. The experimental results show that the grafting yield and gel content of the product can be controlled by selecting the reaction conditions (temperature, time and the composition of the reaction mixture); excessive DCPO is the main reason causing the gel to form by crosslinking; adding DMF Can prevent the occurrence of cross-linking reaction, but the grafting rate of the product also declined, the above results are discussed by the free radical mechanism.