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Polymerization of styrene catalyzed
by rare earth Schiff base complexes |
| SHEN Zhiquan, NI Xufeng, YANG Jianjiang |
| Key Laboratory of Macromolecule Synthesis and Functionalization (Ministry of Education), Institute of Polymer Science, Zhejiang University |
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Abstract The rare earth Schiff base complex Nd(H2Salen)2Cl32C2H5OH was synthesized by a simple and convenient method and characterized by IR and elemental analysis. The catalyst system composed of Nd(H2Salen)2Cl32C2H5OH/Al(i-Bu)3/CCl4 is effective for the polymerization of styrene (St). The optimum conditions are as follows: [St]/[Nd] = 1000, [CCl4]/[Nd] = 9, [Al]/[Nd] = 30, and polymerization at 50°C for 20 h. The resulting polystyrene was characterized by NMR and GPC. The results of NMR show that the polymer obtained had a stereoregularity with 52.3% isotacticity and 47.7% syndiotacticity without any random structure.
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Issue Date: 05 March 2008
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