Comparative examination of acrylic acid and 4-vinylpyridine monomers in liquid-phase photografting on polyethylene film
Comparative examination of acrylic acid and 4-vinylpyridine monomers in liquid-phase photografting on polyethylene film
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丙烯酸和4-乙烯基吡啶单体在聚乙烯薄膜上液相光接枝的比较研究
DOI：
10.1016/0014-3057(94)90035-3
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发表时间：
1994
影响因子：
6
通讯作者：
Y. Hata
中科院分区：
文献类型：
--
作者：
M. Imaizumi;H. Kubota;Y. Hata
研究了单体浓度对丙烯酸(AA)和4-乙烯基吡啶(4VP)接枝链在低密度聚乙烯(厚度=30μm)中的位置的影响，以及在60°下的接枝行为。以二苯甲酮为光引发剂，将其涂覆在薄膜表面。AA接枝率随AA浓度(1.7、3.4和6.8wt%)的增加而增加。在质量分数为6.8wt%的体系中，接枝聚合物的生成克服了均聚物的生成，与质量分数为3.4wt%的样品相比，接枝的AA链更倾向于穿透到膜的内部，在该体系中，均聚物的生成优先进行。而对于4VP单体，随着单体浓度的增加，接枝率降低，但促进了均聚物的形成。4VP接枝链分布在膜内，与单体浓度无关(1.9、3.8和7.6wt%)。对得到的AA和4VP接枝膜进行了pH响应特性的测量，以了解接枝链的位置与功能之间的关系。
The effect of monomer concentration on the location of acrylic acid (AA)- and 4-vinylpyridine (4VP)-grafted chains introduced into low-density polyethylene film (thickness = 30 μm) by liquid-phase photografting (λ> 300 nm) was investigated together with the grafting behaviours at 60°. Benzophenone was used as a photoinitiator by coating it on the film surface. The grafting rate of AA increased with increasing the AA concentration (1.7, 3.4 and 6.8 wt%). The AA-grafted chains of the sample prepared in the system of 6.8 wt% AA concentration, where the formation of grafted polymer overcomes that of homopolymer, tended to penetrate into the film inside compared to those of the sample prepared in the system of 3.4 wt% concentration, in which the formation of homopolymer proceeds preferentially. With 4VP monomer, on the other hand, the grafting rate decreased while promoting the formation of homopolymer as the monomer concentration increases. The 4VP-grafted chains distributed in the film inside irrespective of the monomer concentration (1.9, 3.8 and 7.6 wt%). The resultant AA- and 4VP-grafted films were subjected to measurement of pH-responsive characters in order to understand relationship between the location of grafted chains and the function.