Controlled degradation and crosslinking of polypropylene induced by gamma radiation and acetylene

被引：38
作者：
Yoshiga, Adriana [1 ]
Otaguro, Harumi [1 ]
Parra, Duclerc Fernandes [1 ]
Lima, Luis Filipe C. P. [1 ]
Lugao, Ademar B. [1 ]
机构：
[1] IPEN, CNEN, BR-05508900 Sao Paulo, Brazil
来源：
POLYMER BULLETIN | 2009年 / 63卷 / 03期
基金：
巴西圣保罗研究基金会;
关键词：
Melt strength; Drawability; iPP; Acetylene; Gamma irradiation; ELECTRON-BEAM IRRADIATION; MELT RHEOLOGY; CHAIN;
D O I：
10.1007/s00289-009-0102-7
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Isotactic polypropylene (iPP) undergoes crosslinking and extensive main chain scissions when submitted to irradiation. The simultaneous irradiation of PP and acetylene is able to control chain scission and produce grafting. The grafted PP further reacts with PP radicals resulting in branching and crosslinking. In this work, commercial polypropylenes (iPP) of different molecular weights were irradiated with a Co-60 source at dose of 12.5 kGy in the presence of acetylene in order to promote the crosslinking. The mechanical and rheological tests showed a significant increase in melt strength and drawability of the modified samples obtained from resins with high melt flow index. The characterization of the molecular modifications induced by gamma irradiation of isotactic polypropylenes under acetylene atmosphere proved the existence of branching, crosslinking and chain scission in a qualitative way. The G' and GaEuro(3) indicated the presence of LCB in all samples. Therefore, PP irradiation under acetylene was proved to be an effective approach to achieve high melt strength polypropylene (HMSPP).
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收藏
页码：397 / 409
页数：13
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