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crosslinking kinetics of Polyethylene with Small Amount of Peroxide and Its Influence on the Subsequent Crystallization Behaviors

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Chinese Journal of Polymer Science 2016年第9期34卷 1117-1128页

作者：牛艳华 Wen-bin Liang Yin-ling Zhang Xue-lian Chen Shih-yaw Lai Guang-xian Li Du-jin Wang College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering of ChinaSichuan UniversityChengdu 610065China Performance Material Center National Institute of Clean-and-low-carbon Energy(NICE)Beijing 102209China CAS Key Laboratory of Engineering Plastics Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

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 ℃ 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 k2 at the earlier stage exhibits about 3 times acceleration per 10 ~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 Tc and crystallinity Xc due to the network formation. The secondary crystallization valley located at the temperature near 80 ℃ 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.

关键词： Polyethylene Rheology crosslinking kinetics Crystallization.

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crosslinking kinetics of polyethylene detected by rheological measurements

Crosslinking kinetics of polyethylene detected by rheologica...

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第十二届全国流变学学术会议

作者： YANHUA Niu WENBIN Liang YINLING Zhang SHIH-YAW Lai GUANGXIAN Li Sichuan University National Institute of Clean-and-low-carbon Energy

crosslinking kinetics of high density polyethylene(HDPE)with 2,5-di(t-butyl peroxy)-2,5-dimethyl-3-hexane(DPDH)ranging from 0.1-1.0wt%was investigated by rheological *** indicate that

关键词： polyethylene rheology crosslinking kinetics

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