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题名: Crosslinking kinetics of polyethylene with small amount of peroxide and its influence on the subsequent crystallization behaviors
作者: Niu, Yan-hua1, 2; Liang, Wen-bin2; Zhang, Yin-ling2; Chen, Xue-lian2; Lai, Shih-yaw2; Li, Guang-xian1; Wang, Du-jin3
关键词: Polyethylene ; Rheology ; Crosslinking kinetics ; Crystallization
刊名: CHINESE JOURNAL OF POLYMER SCIENCE
发表日期: 2016-09-01
卷: 34, 期:9, 页:1117-1128
收录类别: SCI
英文摘要: Crosslinking reactions of high density polyethylene with low peroxide concentrations ranging from 0.1 wt% to 1.0 wt% at temperatures of 170, 180 and 190 A degrees C were monitored by rheological measurements. A critical gel forms at the peroxide concentration of 0.2 wt%, where the transition from long chain branching generation to crosslinking network formation could occur. Rheokinetics of crosslinking can be fitted well by Ding-Leonov's model. The curing rate k (2) at the earlier stage exhibits about 3 times acceleration per 10 A degrees C with increasing temperature, while the equilibrium modulus G' at the fully cured stage is almost independent of temperature. Influences of crosslinking on the subsequent crystallization behaviors were detected by DSC measurements. Above the critical gel concentration, crystallization is largely retarded as evidenced by the lower crystallization temperature T (c) and crystallinity X (c) due to the network formation. The secondary crystallization valley located at the temperature near 80 A degrees C can be observed above the critical concentration, which becomes more evident with the increasing peroxide concentration and curing temperature. This phenomenon provides another evidence of crystallization retardation by the crosslinking network.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35203
Appears in Collections:工程塑料实验室_期刊论文

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作者单位: 1.Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn China, Chengdu 610065, Peoples R China
2.Natl Inst Clean & Low Carbon Energy NICE, Performance Mat Ctr, Beijing 102209, Peoples R China
3.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing 100190, Peoples R China
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