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Chem. J. Chinese Universities ›› 2006, Vol. 27 ›› Issue (5): 970.doi:

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Rare Earth Compounds Assisted Melt Grafting of Maleic Anhydride onto Isotactic Polypropylene by Reactive Extrusion

ZHU Lian-Chao1,2, TANG Gong-Ben1, SHI Qiang1,2, YIN Jing-Hua1*   

  1. 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
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-05-10 Published:2006-05-10
  • Contact: YIN Jing-Hua

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Abstract:

A series of rare earth compounds were employed for melt grafting of maleic anhydride(MAH) onto isotactic polypropylene(iPP) by reactive extrusion. Melt flow rate(MFR) of the graft copolymers and the grafting degree of MAH monomer were measured for determining the impact of rare earth compounds on the grafting reaction. It was shown that rare earth oxides, neodymium oxide as well as cerium oxide, promoted the grafting reaction. The increment of the grafting degree maximally were up to about 14% and 25% respectively compared with those of the related system without importing any rare earth compound, whereas MFR of the graft copolymers were enhanced by 36% and 56%. According to the correlation between MFR of the graft copolymers and the grafting degree of MAH under our experimental condition, a method that characterized the grafting degree by means of MFR was put forward and a calibration curve was also built up. The inhibition and synergism mechanisms that rare earth compounds having impact on grafting reaction were tentatively investigated.

Key words: Isotactic polypropylene; Reactive extrusion; Maleic anhydride; Rare earth compound

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