Synthesis of styrene-norbornene diblock copolymers via ring-opening metathesis polymerization and nitroxide-mediated radical polymerization

IF 6.3 2区化学 Q1 POLYMER SCIENCE

European Polymer Journal Pub Date : 2022-04-05 DOI:10.1016/j.eurpolymj.2022.111085

Guangwei Hu , Shaohui Lin , Boxin Zhao , Flora Ng , Qinmin Pan

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引用次数: 2

Abstract

Diblock copolymers containing polynorbornene (PNB) and polystyrene (PS) were synthesized by ring-opening metathesis polymerization (ROMP) and nitroxide-mediated radical polymerization (NMRP) approach. PNB containing nitroxide free radical was prepared by ROMP in presence of Grubbs 2nd generation catalyst and served as a macro-initiator for NMRP of styrene to achieve the targeting diblock copolymers. The effects of the chain transfer agent (CTA) concentration, catalyst amount, reaction time and reaction temperature on the synthesis of macro-initiator as well as the effects of mole ratio of monomer to macro-initiator and reaction time on the synthesis of diblock copolymers were studied. As a result, the diblock copolymers with M_n ranging from 5 kDa to 10 kDa and PDI ranging from 1.5 to 1.8 were obtained successfully. The desired diblock copolymers have broad applications in polymer electrolytes, nanoporous membranes and many other fields.

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开环复分解聚合和氮氧化物自由基聚合合成苯乙烯-降冰片烯二嵌段共聚物

采用开环复分解聚合(ROMP)和氮氧化物自由基聚合(NMRP)方法合成了含聚降冰片烯(PNB)和聚苯乙烯(PS)的双嵌段共聚物。在Grubbs第二代催化剂的存在下，采用ROMP法制备了含氮氧化物自由基的PNB，并作为苯乙烯NMRP的宏观引发剂，实现了目标二嵌段共聚物的合成。研究了链转移剂(CTA)浓度、催化剂用量、反应时间和反应温度对宏观引发剂合成的影响，以及单体与宏观引发剂的摩尔比和反应时间对二嵌段共聚物合成的影响。结果表明，成功制备了Mn值为5 ~ 10 kDa、PDI值为1.5 ~ 1.8的二嵌段共聚物。所期望的二嵌段共聚物在聚合物电解质、纳米孔膜和许多其他领域具有广泛的应用。

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来源期刊

European Polymer Journal 化学-高分子科学

CiteScore

9.90

自引率

10.00%

发文量

691

审稿时长

23 days

期刊介绍： European Polymer Journal is dedicated to publishing work on fundamental and applied polymer chemistry and macromolecular materials. The journal covers all aspects of polymer synthesis, including polymerization mechanisms and chemical functional transformations, with a focus on novel polymers and the relationships between molecular structure and polymer properties. In addition, we welcome submissions on bio-based or renewable polymers, stimuli-responsive systems and polymer bio-hybrids. European Polymer Journal also publishes research on the biomedical application of polymers, including drug delivery and regenerative medicine. The main scope is covered but not limited to the following core research areas: Polymer synthesis and functionalization • Novel synthetic routes for polymerization, functional modification, controlled/living polymerization and precision polymers. Stimuli-responsive polymers • Including shape memory and self-healing polymers. Supramolecular polymers and self-assembly • Molecular recognition and higher order polymer structures. Renewable and sustainable polymers • Bio-based, biodegradable and anti-microbial polymers and polymeric bio-nanocomposites. Polymers at interfaces and surfaces • Chemistry and engineering of surfaces with biological relevance, including patterning, antifouling polymers and polymers for membrane applications. Biomedical applications and nanomedicine • Polymers for regenerative medicine, drug delivery molecular release and gene therapy The scope of European Polymer Journal no longer includes Polymer Physics.