Long chain branching on linear polypropylene by solid state reactions
Long chain branching on linear polypropylene by solid state reactions
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DOI：
10.1016/j.eurpolymj.2007.10.008
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发表时间：
2008
影响因子：
6
通讯作者：
E. Borsig;M. Duin;A. Gotsis;F. Picchioni
中科院分区：
文献类型：
--
作者：
E. Borsig;M. Duin;A. Gotsis;F. Picchioni
采用固相法对等规聚丙烯（iPP）进行长链支化改性。在自由基引发剂和多官能单体（活性助剂）的存在下，使用固态反应将PP长链作为支链连接到原始线性iPP链。用凝胶渗透色谱法（GPC）和流变学方法对支化聚丙烯的改性样品进行了表征。应用了几种方法来间接估计分支的程度。根据活性助剂诱导LCB的能力而不是iPP的交联和降解，对活性助剂进行排序。糠基硫醚（FS）的支化反应效率最高，而二乙烯基苯（DVB）不适合支化反应。
A method was developed for the long chain branching (LCB) of isotactic polypropylene (iPP) via modification in the solid state. PP long chains have been linked as branches to the original linear iPP chains using solid state reactions in the presence of a free radical initiator and a multifunctional monomer (co-agent). The modified samples of branched iPP were characterised by gel permeation chromatography (GPC) and rheological measurements. Several methods were applied in order to estimate indirectly the extent of branching. A ranking was made of the co-agents according to their ability in inducing LCB as opposed to cross-linking and degradation of iPP. The furfuryl sulphide (FS) showed the highest efficiency for the branching reaction, while the divinylbenzene (DVB) is not suitable for branching.