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| Effect of feed ratio of catalysts to selfinitiator monomer on branching degree of hyperbranched poly(4-chlormethylstyrene) |
| School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract A series of hyperbranched poly(4-chlormethylstyrene) \[P(4–CMS)\] with various degree of branching were prepared with selfinitiator monomer of 4-CMS and CuCl/2,2′-Bipyridine as catalysts in solvent of chlorobenzene. The effect of the molar ratio of catalyst to monomer on the degree of branching of products was investigated. The products were characterized by GPC and NMR. The results show that the degree of branching is small at very low or high molar ratio. The highest degree of branching is achieved at the molar ratio range from 0.1 to 0.2. The architecture of the products can be designed by adjusting the molar ratio. Based on the kinetic analysis, if one catalyst molecule can activate 2.6 average times, the theoretical kinetic calculations are in good agreement with the experimental results.
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Received: 17 October 2012
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2013, Vol. 34 
