光诱导电子转移可逆加成-断裂链转移聚合(Photoinduced Electron Transfer-Reversible Addition Fragmentation Chain Transfer Polymerization,PET-RAFT聚合,凭借能耗低、反应条件温和、时空可控、反应正交性和耐氧性等特性在聚合领域...光诱导电子转移可逆加成-断裂链转移聚合(Photoinduced Electron Transfer-Reversible Addition Fragmentation Chain Transfer Polymerization,PET-RAFT聚合,凭借能耗低、反应条件温和、时空可控、反应正交性和耐氧性等特性在聚合领域得到广泛关注与应用,在表面改性方面,PET-RAFT聚合被用于改善材料的表面特性,如生物相容性和抗黏附性。在生物医药领域,PET-RAFT聚合技术用于药物递送系统,如球形胶束和囊泡。此外,PET-RAFT聚合在3D打印和激光写入中的应用展示了其在精确控制材料结构和功能化方面的巨大潜力。PET-RAFT聚合的关键在于寻找合适的光催化剂,目前催化剂包括均相和非均相催化剂体系,均相催化体系如过渡金属络合物、卟啉及酞菁类催化剂、有机染料和半导体材料等,非均相催化剂体系如宏观材料负载型、纳米材料负载型、金属有机框架型、共价有机框架型和共轭微孔聚合物等,其中非均相催化剂可以通过离心和过滤分离对光催化剂进行有效回收利用。未来研究者将开发新型低成本、高效率、易回收、无毒的光催化剂以提高低能光子的使用效率和改善光聚合与环境的相容性。展开更多
Polymerization-induced self-assembly(PISA)has become one of the most versatile approaches for scalable preparation of linear block copolymer nanoparticles with various morphologies.However,the controlled introduction ...Polymerization-induced self-assembly(PISA)has become one of the most versatile approaches for scalable preparation of linear block copolymer nanoparticles with various morphologies.However,the controlled introduction of branching into the core-forming block and the effect on the morphologies of block copolymer nanoparticles under PISA conditions have rarely been explored.Herein,a series of multifunctional macromolecular chain transfer agents(macro-CTAs)were first synthesized by a two-step green light-activated photoiniferter polymerization using two types of chain transfer monomers(CTMs).These macro-CTAs were then used to mediate reversible addition-fragmentation chain transfer(RAFT)dispersion polymerization of styrene(St)to prepare block copolymers with different core-forming block structures and the assemblies.The effect of the core-forming block structure on the morphology of block copolymer nanoparticles was investigated in detail.Transmission electron microscopy(TEM)analysis indicated that the brush-like core-forming block structure facilitated the formation of higher-order morphologies,while the branched core-forming block structure favored the formation of lower-order morphologies.Moreover,it was found that using macroCTAs with a shorter length also promoted the formation of higher-order morphologies.Finally,structures of block copolymers and the assemblies were further controlled by changing the structure of macro-CTA or using a binary mixture of two different macro-CTAs.We expect that this work not only sheds light on the synthesis of block copolymer nanoparticles but also provide important mechanistic insights into PISA of nonlinear block copolymers.展开更多
概述RAFT教学法的内涵和作用。介绍应用文写作和高中英语应用文写作。以牛津译林版高中《英语》必修二Unit 1 Lights,camera,action!中Reading板块Behind the Scenes为例,从写作前、写作中、写作后三个阶段探索如何在RAFT教学法的指导...概述RAFT教学法的内涵和作用。介绍应用文写作和高中英语应用文写作。以牛津译林版高中《英语》必修二Unit 1 Lights,camera,action!中Reading板块Behind the Scenes为例,从写作前、写作中、写作后三个阶段探索如何在RAFT教学法的指导下利用教材语篇实施应用文写作教学,以提升高中生的应用文写作能力。展开更多
It was demonstrated that the fast RAFT polymerization of styrene with almost perfect polymerization performance could be achieved by using a carefully designed miniemulsion polymerization system.With much higher level...It was demonstrated that the fast RAFT polymerization of styrene with almost perfect polymerization performance could be achieved by using a carefully designed miniemulsion polymerization system.With much higher levels of surfactant (9 wt% based on monomer) and co-stabilizer (5 wt% based on monomer) than those in typical miniemulsion polymerization,the miniemulsion polymerization using 1-phenylethyl phenyl-dithioacetate as a RAFT agent showed a very fast polymerization rate,excellent performance of living radical polymerization during the entire polymerization process,and narrow particle size distributions.It was concluded that RAFT miniemulsion polymerization presented an excellent commercial process for a living radical polymerization system.展开更多
文摘光诱导电子转移可逆加成-断裂链转移聚合(Photoinduced Electron Transfer-Reversible Addition Fragmentation Chain Transfer Polymerization,PET-RAFT聚合,凭借能耗低、反应条件温和、时空可控、反应正交性和耐氧性等特性在聚合领域得到广泛关注与应用,在表面改性方面,PET-RAFT聚合被用于改善材料的表面特性,如生物相容性和抗黏附性。在生物医药领域,PET-RAFT聚合技术用于药物递送系统,如球形胶束和囊泡。此外,PET-RAFT聚合在3D打印和激光写入中的应用展示了其在精确控制材料结构和功能化方面的巨大潜力。PET-RAFT聚合的关键在于寻找合适的光催化剂,目前催化剂包括均相和非均相催化剂体系,均相催化体系如过渡金属络合物、卟啉及酞菁类催化剂、有机染料和半导体材料等,非均相催化剂体系如宏观材料负载型、纳米材料负载型、金属有机框架型、共价有机框架型和共轭微孔聚合物等,其中非均相催化剂可以通过离心和过滤分离对光催化剂进行有效回收利用。未来研究者将开发新型低成本、高效率、易回收、无毒的光催化剂以提高低能光子的使用效率和改善光聚合与环境的相容性。
基金financially supported by the National Natural Science Foundation of China(Nos.22171055 and 52222301)the Guangdong Natural Science Foundation for Distinguished Young Scholar(No.2022B1515020078)the Science and Technology Program of Guangzhou(No.2024A04J2821)。
文摘Polymerization-induced self-assembly(PISA)has become one of the most versatile approaches for scalable preparation of linear block copolymer nanoparticles with various morphologies.However,the controlled introduction of branching into the core-forming block and the effect on the morphologies of block copolymer nanoparticles under PISA conditions have rarely been explored.Herein,a series of multifunctional macromolecular chain transfer agents(macro-CTAs)were first synthesized by a two-step green light-activated photoiniferter polymerization using two types of chain transfer monomers(CTMs).These macro-CTAs were then used to mediate reversible addition-fragmentation chain transfer(RAFT)dispersion polymerization of styrene(St)to prepare block copolymers with different core-forming block structures and the assemblies.The effect of the core-forming block structure on the morphology of block copolymer nanoparticles was investigated in detail.Transmission electron microscopy(TEM)analysis indicated that the brush-like core-forming block structure facilitated the formation of higher-order morphologies,while the branched core-forming block structure favored the formation of lower-order morphologies.Moreover,it was found that using macroCTAs with a shorter length also promoted the formation of higher-order morphologies.Finally,structures of block copolymers and the assemblies were further controlled by changing the structure of macro-CTA or using a binary mixture of two different macro-CTAs.We expect that this work not only sheds light on the synthesis of block copolymer nanoparticles but also provide important mechanistic insights into PISA of nonlinear block copolymers.
文摘概述RAFT教学法的内涵和作用。介绍应用文写作和高中英语应用文写作。以牛津译林版高中《英语》必修二Unit 1 Lights,camera,action!中Reading板块Behind the Scenes为例,从写作前、写作中、写作后三个阶段探索如何在RAFT教学法的指导下利用教材语篇实施应用文写作教学,以提升高中生的应用文写作能力。
文摘It was demonstrated that the fast RAFT polymerization of styrene with almost perfect polymerization performance could be achieved by using a carefully designed miniemulsion polymerization system.With much higher levels of surfactant (9 wt% based on monomer) and co-stabilizer (5 wt% based on monomer) than those in typical miniemulsion polymerization,the miniemulsion polymerization using 1-phenylethyl phenyl-dithioacetate as a RAFT agent showed a very fast polymerization rate,excellent performance of living radical polymerization during the entire polymerization process,and narrow particle size distributions.It was concluded that RAFT miniemulsion polymerization presented an excellent commercial process for a living radical polymerization system.
