期刊
CHEMICAL ENGINEERING SCIENCE
卷 230, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2020.116229
关键词
Grafting; Nanoreactors; Maleic anhydride; Polypropylene; Reactive processing; Mechanism
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [141584/2010-6]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2008/04334-2, 2011/21313-1]
This study proposed a new reactive mechanism for PP-graft-MA, involving the use of nanoreactors to control PP degradation and promote MA homopolymerization. Experimental results showed that the presence of organic clay inhibited the formation of oligo (MA) and reduced degradation of the PP chain.
PP-graft-MA is a common PP compatibilizer, produced via reactive extrusion using peroxides as initiator, which causes severe molar mass reduction. To control PP degradation and increase maleic anhydride grafting, Shi and coworkers (2006), proposed the use of nanoreactors. In this paper we propose a complete new reactive mechanism involving nanoreactors during PP-graft-MA reactive processing. The samples were prepared via melt mixing using nanoreactors with different organoclay: peroxide ratios (oMMT:DCP). Organic MMT showed to absorb not more than 16 wt% of DCP, i.e., diffusional controlled release of alkoxy radical will not be observed at o-MMT:DCP ratios < 5:1. The presence of o-MMT tend to increase MA homopolymerization, which consumes the initiator, interfering with the grafting of succinic groups onto the PP backbone, due to increased hindrance of oligo (MA) formed, thereby reducing degradation of the PP chain. Thus, the use of nanoreactors promotes MA homopolymerization rather than grafting as previously proposed in the literature. (C) 2020 Elsevier Ltd. All rights reserved.
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