CO2 基超支化聚炔酯:一种新型功能化平台聚合物

CO2-Based Hyperbranched Poly(alkynoate)s:A Platform Polymer for Diverse Functionalizations

作为一种丰富、无毒和廉价的碳一化合物,二氧化碳(CO2)已被用于合成系列线形聚合物(如聚碳酸酯、聚氨酯和聚脲等),但以CO2为单体直接合成超支化聚合物鲜有报道。近期,华南理工大学秦安军和唐本忠团队利用CO2、多官能度炔和二卤代物在常压条件下合成了一种新结构的超支化聚炔酯,其特别之处是分子中含有反应活性显著不同的两种炔基,因而可以实现多步选择性化学后修饰,如:制得了高载药量的两亲性超支化聚前药分子、高能量转移效率的“光捕获”体系和纯白光聚合物。这一研究为直接利用CO2合成功能型超支化聚合物提供了一条新途径。

As an abundant,nontoxic and inexpensive one-carbon(C1)feedstock,carbon dioxide(CO2)has been used as the monomer for preparing a variety of polymers via copolymerization process,such as polycarbonates,poly(urethane)s and polyureas that are linear chain structure.Due to the limit in designing multi-functionalized comonomers,using CO2 to synthesize polymers with different architectures,such as hyperbranched polymers(HBPs),is rarely reported.Recently,Qin and Tang et al.have reported a successful synthesis of CO2-based hyperbranched poly(alkynoate)s(hb-PAs)via threecomponent polymerization of CO2,multi-functionalized alkyne and dihalides under mild conditions.The resultant polymer possessed two types of ethynyl groups with different reactivities towards the same types of amines,so it could undergo siteselective,multi-step functionalizations.Taking advantage of this facile and efficient site-selective functionalization strategy,they prepared a hyperbranched polyprodrug amphiphile with high drug loading content,an artificial light-harvesting system with high energy transfer efficiency and pure white light-emitting polymeric materials.This work provides a new method to convert CO2 into multifunctional HBPs that are platform polymers for diverse functionalizations.