Conversion measurement in polyethylene/peroxide coupling system under steady shear flow |
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| Authors: | Mengge Liu Chixing Zhou Jinghua Yin |
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| Affiliation: | a Department of Polymer, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
b Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China |
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| Abstract: | The coupling reaction of melt linear low density polyethylene (LLDPE) initiated by dicumyl peroxide (DCP) in steady shear flow field was investigated. The conversion of DCP was measured by electron spin resonance (ESR) and chemical titration. An absolute method was proposed to calculate the actual conversion of DCP from rheological data. The coupling efficiency of DCP was obtained from those analyses, which was shown to increase at first, reach a maximum and then decrease in the end stage. A linear relationship between the coupling efficiency of DCP and the concentration of macroradicals was also found in the experiments. |
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| Keywords: | Conversion Peroxide Coupling efficiency |
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