Chem. J. Chinese Universities

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Grafting Acrylic Acid onto Pre-irradiated Polypropylene by Reactive Extrusion

CAI Chuan-Lun1,2, XIN Zhi-Rong3, YAO Zhan-Hai1, SHI Qiang1,2, YIN Jing-Hua1   

    1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;
    3. College of Biology & Chemistry, Yantai University, Yantai 264005, China
  • Received:2006-03-09 Revised:1900-01-01 Online:2006-10-10 Published:2006-10-10
  • Contact: YIN Jing-Hua

Abstract:

Polypropylene functionalized with acrylic acid(PP-g-AA) was prepared by coupling electron beam(EB) pre-irradiation treatment with reactive extrusion process. The grafting samples were characterized by chemical titration, FTIR, polarized light microphotographs, DSC and WAXD. The study showed that grafting degree(Gd) increased with increasing irradiation dose and then leveled off; the Gd increased linearly with the AA concentration rising. It was observed that crystallization temperature of the grafted sample increased and crystallite size decreased, which can be attributed to the heterogeneous nucleating action of grafting chain. The MFR and mechanical properties measurements proved that serious degradation of PP occured in the stage of pre-irradiation and extruding process. Meanwhile, a mechanism of grafting reactions was proposed tentatively.

Key words: Polypropylene, Reactive extrusion, Electron beam pre-irradiation, Acrylic acid

CLC Number: 

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