聚苯乙烯非均相催化加氢研究进展

Progress of Polystyrene Heterogeneous Catalytic Hydrogenation System

随着国民经济发展和人民生活水平的不断提高,聚苯乙烯(PS)产品的多样化、专业化成为了市场竞争和用户需求的发展趋势。聚合物催化加氢工艺作为提高PS专用料性能的重要改性手段,近几年来已成为不饱和聚合物化学改性领域的研究热点。文中主要综述了国内外PS非均相催化加氢制备聚环己烷基乙烯(PCHE)体系中加氢工艺的改进、加氢催化剂的设计优化及反应机理研究的新进展。阐述了催化剂的结构设计、物化性能以及反应过程中传质扩散阻力等对PS加氢活性的影响,探讨了PS非均相催化加氢体系中的"Blocky"加氢机理,提出未来PS非均相加氢催化剂研究重点应该放在催化剂的结构设计上,既要保证聚合物分子与活性中心高接近性,又要实现在加氢体系中的传质扩散与催化剂载体上活性位点高分散的最佳平衡。同时,为进一步提高加氢催化剂的综合性能,需要加强对聚合物加氢反应机理和催化剂合成改性技术的基础性研究。

With the development of national economy and the continuous improvement of people’s living standard,the diversification and specialization of polystyrene(PS)products have become the development trend of market competition and consumers’requirements.As an important modification method to improve the properties of PS special materials,catalytic hydrogenation process has become a research hotspot in the field of chemical modification of unsaturated polymers in recent years.Herein,the improvement of hydrogenation process,the design and optimization of hydrogenation catalysts and the new progress of reaction mechanism in the preparation of polycyclohexylethylene(PCHE)through PS heterogeneous catalytic hydrogenation were reviewed.The influence of the structure design,physical and chemical properties of the hydrogenation catalyst and mass transfer diffusion resistance on the process of PS hydrogenation catalyst activity was elaborated.The"Blocky"mechanism of PS hydrogenation was discussed in the heterogeneous catalytic hydrogenation system.It is suggested that the future research of PS hydrogenation catalysts should be focused on the structure design of catalysts to ensure high accessibility of the active sites for polymer molecules and optimize the balance between the mass transfer diffusion in the hydrogenation system and dispersity of active sites on the catalyst carrier.At the same time,in order to further improve the comprehensive performance of hydrogenation catalysts,more efforts should be devoted to the fundamental research on the hydrogenation mechanism of polymers and synthesis/modification technology of catalysts.