Studies on the cationic copolymerization of alpha-pinene and styrene with the AlCl3/SbCl3 catalyst

作者：Deng YX^*; Peng CP; Duan W; Zhang RJ; Zeng LM

来源：Chemical Journal of Chinese Universities, 1996, 17(9): 1467-1472.

• complex AlCl3/SbCl3 catalyst
• cationic copolymerization of alpha-pinene/styrene
• composition of copolymerization product
• monomer reactivity ratio determination

The copolymerization products of alpha-pinene (M(1)) and styrene (M(2)) were prepared with the catalyst system SbCl3/AlCl3 by changing the Sb/Al ratio, feeding monomer ratio, solvent and polymerization temperature. The compositions of the copolymerization products were quantitatively characterized by the method of the combination of micro-ozonization and thin-layer chromatography in terms of the contents of the homopolymers and the copolymers. The results show that it was easier to obtain the higher yield(up to 80%) of the pure copolymer with the complex catalyst system than with AlCl3 alone. The F-1 values could be controlled between 30% similar to 56%.
The monomer reactivity ratios were determined under the polymerization conditions under which only pure copolymer of M(1) and M(2) was given by using Mayo-Lewis equation. The effects of various catalyst systems and polymerization conditions on the reactivity ratio were also investigated and it was found that the r(1) increase from 0.19 to 0.22 similar to 0.24 with the AlCl3/SbCl3 instead of AlCl3, but the r(1) decrease significantly (from 5.00 to 1.20 similar to 1.92). On account of the r(2)/r(1) value is decreased 4 similar to 6 times, the copolymerization of M(1)/M(2) was changed into carried out with ease. It was supposed that this good copolymerization activity is attributed to its nonprotonic active species and the characteristic of the counteranion's structure.

• 出版日期1996-9
• 单位中山大学