The Rheological Property and Foam Morphology of Linear Polypropylene and Long Chain Branching Polypropylene
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2013年第4期
论文作者：黄锦涛 HE Guangjian 廖霞 HUANG Yajiang YANG Qi
文章页码：798 - 803
摘 要：The rheological behavior, thermal properties and foam morphology of linear polypropylene and long chain branching polypropylene prepared through UV irradiation reactive extrusion were studied by rheological test, melt index test, DSC and supercritical carbon dioxide foaming technology. Rheological test and melt index test confirmed that under UV irradiation and extrusion, adding photo-initiator and cross-linking agent could achieve the purpose of branching, thus improved the melt strength of polypropylene effectively. The DSC results revealed that with the introducing of long chain branching, the melting range of the polypropylene broadened and the crystallization temperature increased. Owing to the introduction of long chain branches, polypropylene exhibited higher melt strength and strain hardening behavior. Compared with linear polypropylene, the foam morphologies of long chain branching polypropylene were more uniform.
黄锦涛1，HE Guangjian2，廖霞1，HUANG Yajiang1，YANG Qi1
1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University2. Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology
摘 要：The rheological behavior, thermal properties and foam morphology of linear polypropylene and long chain branching polypropylene prepared through UV irradiation reactive extrusion were studied by rheological test, melt index test, DSC and supercritical carbon dioxide foaming technology. Rheological test and melt index test confirmed that under UV irradiation and extrusion, adding photo-initiator and cross-linking agent could achieve the purpose of branching, thus improved the melt strength of polypropylene effectively. The DSC results revealed that with the introducing of long chain branching, the melting range of the polypropylene broadened and the crystallization temperature increased. Owing to the introduction of long chain branches, polypropylene exhibited higher melt strength and strain hardening behavior. Compared with linear polypropylene, the foam morphologies of long chain branching polypropylene were more uniform.
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