共查询到19条相似文献,搜索用时 62 毫秒
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介绍了一些主要的可控/活性自由基聚合法,包括氮氧调解自由基聚合法(NMRP)、原子转移自由基聚合法(ATRP)、可逆加成断裂链转移聚合法(RAFT)在粒子表面接枝聚合形成无机纳米粒子/聚合物的壳核结构,达到了对粒子改性的目的。并提出了一些目前研究中存在的问题,对可控/活性聚合应用的发展进行了展望。 相似文献
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《化工生产与技术》2015,(6)
介绍了制备超高相对分子质量聚(甲基)丙烯酸酯的常用方法,如等离子体引发自由基聚合、单电子转移-衰减链转移自由基聚合、反向原子转移自由基聚合、可逆加成-断裂链转移聚合、高压原子转移自由基聚合、金属催化活性自由基聚合等,分析了单体含量、催化剂种类和用量、引发剂种类和含量、反应温度、反应时间、反应压力等对合成超高相对分子质量聚(甲基)丙烯酸酯的影响,介绍了其良好的机械强度和透光性能以及其应用情况。认为超高相对分子质量聚(甲基)丙烯酸甲酯其韧性不足,极大地限制了其适用范围,如果将其与纳米材料复合改性将可以弥补这个缺点。复合改性的超高相对分子质量聚(甲基)丙烯酸甲酯将在有机玻璃及包覆材料等领域中具有非常广泛的应用前景。 相似文献
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提供与普通聚合法相比分子质量分布范围窄的聚氯乙烯等含氯聚合物的简单制备方法。它是将含氯单体用活性自由基聚合法聚合,来制备聚氯乙烯等含氯聚合物的方法。而活性自由基聚合方法有2种,1种是卤素原子转移型活性自由基聚合法,另1种是将稳定的氮氧自由基作为自由基终止剂的活性自由基聚合法。 相似文献
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本文研究了以偶氮二异丁腈(AIBN)为引发剂、二甲基甲酰胺(DMF)和水为混合溶剂的丙烯腈光引发法,发现该法完全符合自由基聚合一般原理,在无缠结影响的条件下测定出重均分子量超过100万的聚丙烯腈。并由讨论得知丙烯腈自由基聚合法所得极限重均分子量均为350万。 相似文献
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韦永继 《化学推进剂与高分子材料》1991,(3)
合成出符合聚合要求的2,2-二乙基-4-亚甲基-1,3-二氧戊环(DMD)单体,实验证明该单体没有自由基均聚活性,但能同丙烯腈(AN)发生自动和自由基引发的自由基共聚合反应。运用红外光谱和核磁共振对聚合物结构进行研究,发现 DMD 与 AN 进行自由基共聚合反应时,既有加成聚合,又有开环聚合.测定了共聚物的链节比和开环度,并初步研究了自由基共聚合机理。 相似文献
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Mohsen Mosadegh 《Polymer-Plastics Technology and Engineering》2017,56(11):1247-1258
Poly(sodium styrenesulfonate)-functionalized graphene was prepared from graphene oxide, using atom transfer radical polymerization and free radical polymerization. In atom transfer radical polymerization route, the amine-functionalized GO was synthesized through hydroxyl group reaction of GO with 3-amino propyltriethoxysilane. Atom transfer radical polymerization initiator was grafted onto modified GO (GO-NH2) by reaction of 2-bromo-2-methylpropionyl bromide with amine groups, then styrene sulfonate monomers were polymerized on the surface of GO sheets by in situ atom transfer radical polymerization. In free radical polymerization route, the poly(sodium 4-styrenesulfonate) chains were grafted on GO sheets in presence of Azobis-Isobutyronitrile as an initiator and styrene sulfonate monomer in water medium. The resulting modified GO was characterized using range of techniques. Thermal gravimetric analysis, scanning electron microscopy, transmission electron microscopy, and atomic force microscopy results indicated the successful graft of polymer chains on GO sheets. Thermogravimetric analysis showed that the amount of grafted polymer was 22.5 and 31?wt% in the free radical polymerization and atom transfer radical polymerization methods, respectively. The thickness of polymer grafted on GO sheets was 2.1?nm (free radical polymerization method) and 6?nm (atom transfer radical polymerization method) that was measured by atomic force microscopy analysis. X-ray diffractometer and transmission electron microscopy indicated that after grafting of poly(sodium 4-styrenesulfonate), the modified GO sheets still retained isolated and exfoliated, and also the dispersibility was enhanced. 相似文献
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Mehmet Atilla TasdelenMuhammet U. Kahveci Yusuf Yagci 《Progress in Polymer Science》2011,36(4):455-567
Telechelic polymers, defined as macromolecules that contain two reactive end groups, are used as cross-linkers, chain extenders, and important building blocks for various macromolecular structures, including block and graft copolymers, star, hyperbranched or dendritic polymers. This review article describes the general techniques for the preparation of telechelic polymers by living and controlled/living polymerization methods; namely atom transfer radical polymerization, nitroxide mediated radical polymerization, reversible addition-fragmentation chain transfer polymerization, iniferters, iodine transfer polymerization, cobalt mediated radical polymerization, organotellurium-, organostibine-, organobismuthine-mediated living radical polymerization, living anionic polymerization, living cationic polymerization, and ring opening metathesis polymerization. The efficient click reactions for the synthesis of telechelic polymers are also presented. 相似文献
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介绍了基于可逆链转移思想的“活性”/控制自由基聚合。着重介绍澳大利亚Rizzardo研究小组的最新研究成果:以双硫酯类化合物为链转移剂的可逆加成-断裂链转移自由基聚合。分析其活性特征,并阐明其反应机理 相似文献
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阐述了活性自由基聚合的产生背景和基本概念,介绍了活性自由基聚合的分类,描述了原子转移自由基聚合的研究进展。 相似文献