摘要
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。
Functionalization of low density polyethylene, LDPE, has been performed by dicumylperoxide (DCPO) promoted grafting of dibutylmaleate (DBM) by means of melt mixing. The influence of some process parameters and of the composition of the reaction mixture on the degree of grafting and on the crosslinking and branching or degradation of LDPE has been investigated.In order to determine the degree of grafting, the ester groups in the LDPE-g-DBS samples were measired by soapinification method. The crosslinking and branching or degradation of LDPE during the reaction was indirectly monitored by means of solubility separaton and solution viscosimetry. The amount of grafted groups and gel content can be controlled by an appropriate choice of the process parameters. The presence of DMF in the reaction mixure can decrease the gel content, but also the degree of grafting. The results are discussed on the basis of a proposed free radical mechanism.
出处
《功能高分子学报》
CAS
CSCD
1991年第2期115-122,共8页
Journal of Functional Polymers
基金
国家自然科学基金
关键词
马来酸二丁酯
聚乙烯
熔融接枝
functionalization, melt mixing, dibutylmaleate, degree of grafting, crosslinking, branch
