Chinese Journal of Applied Chemistry

Chinese Journal of Applied Chemistry ›› 1986, Vol. 0 ›› Issue (5): 69-74.

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13C-NMR STUDY ON THE LIQUID POLYBUTADIENE SYNTHESIZED BY COBALT BASED CATALYST SYSTEMEND GROUP BRANCHED STRUCTURE AND MODIFICATION MECHANISM BY α-OLEFINE

Zhang Xitian1, Pei Fengkui1, Jiao Shuke2, Hu Liping2   

  1. 1. Changchun Institute of Applied Chemistry, Academia Sinica;
    2. Department of Applied Chemistry, Beijing Institute of Chemical Technology
  • Received:1985-04-10 Revised:1985-10-30 Published:1986-10-10 Online:1986-10-10

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Abstract: With the aid of 13C-NMR spectra of liquid polyoutadiene(PB), catalytically synthe-sized by Co(Nap)2-Al(i-Bu)3-PhCCl3, some terminal structures of PB Ⅰ-Ⅵ and two branch structures ⅩⅥ and ⅩⅦ have been identified, providing valuable information for chain initiation mechanism. On the basis of branch structure the number average molecular weight of samples was calculated and compared with the result obtained from VPO measurement.The 13C NMR spectra of PB modified by α-olefine reveal that α-ole-fine only modifies the molecular weight of the polymer, it does not copolymerize with butadiene.

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