共查询到19条相似文献,搜索用时 780 毫秒
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原子转移自由基聚合反应(ATRP)是实现活性聚合的一种颇为有效的途径, 可以合成分子量可控、分子量分布窄的各种形状的聚合物.本文介绍了"活性"可控ATRP的研究进展, 包括RATRP、SR&NI ATRP、AGET ATRP、假卤素转移自由基聚合以及一些新催化剂体系下的新型ATRP,并说明了各种引发体系ATRP的反应机理. 相似文献
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原子转移自由基聚合(ATRP)的研究进展 总被引:1,自引:0,他引:1
汪永彬 《化学推进剂与高分子材料》2014,(1):32-36
介绍了可以实现活性聚合的ATRP、RATRP、AGET ATRP和ARGET ATRP 4种原子转移自由基聚合的机理,综述了原子转移自由基聚合技术在合成两亲性嵌段共聚物、接枝聚合物和星型共聚物等中的研究进展。 相似文献
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采用Tween 80为乳化剂,FeCl3.6H2O/EDTA/AIBN为催化引发体系,在乳液体系中对苯乙烯、丙烯酸丁酯进行反向原子转移自由基(RATRP)共聚合。考察了原料加入方式、过渡金属催化剂浓度及反应温度对RATRP乳液聚合影响。结果表明,得到聚合物的分子量与单体转化率呈线性增长,分子量分布较窄(PDI为1.40)的无规共聚物。借助于凝胶渗透色谱(GPC)和红外光谱仪(IR)对RATRP共聚乳液进行表征,表明加入催化体系进行RA-TRP乳液聚合是"活性"可控聚合。 相似文献
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介绍活性聚合原子转移自由基聚合(ATRP)聚合机理,并综述ATRP聚合新型催化体系研究现状,最后对ATRP聚合新型催化体系的发展前景和挑战进行讨论。 相似文献
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通过脱醇法在凹凸棒土(ATP)表面接枝γ-氨丙基三乙氧基硅烷(APTES)实现氨基化(ATP-APTES),再经酰胺化反应接枝α-溴代异丁酰溴,从而在ATP表面固载ATRP引发基团(ATP-Br);最后以2,2-偶氮二异丁腈(AIBN)和ATP-Br为双组分引发体系进行正反向同时引发原子转移自由基聚合(SR&NI ATRP)制备ATP接枝聚苯乙烯杂化粒子(ATP@PS)。结果表明AIBN结合ATP-Br引发体系进行SR&NI ATRP具有活性/可控聚合的特征,随催化剂用量增大,体系过早偏离一级动力学行为。聚合温度在80℃,投料比为单体/催化剂/AIBN/ATP-Br=200/0.3/0.05/0.5的条件下,接枝聚合物和游离聚合物分子量差异随转化率(c)增大逐渐增加,转化率为31.1%时,两者分子量分布(PDI)均保持在1.54以下,ATP-Br表面ATRP引发基团的引发效率为6.3%。杂化粒子在PS基体中分散得到明显改善。 相似文献
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Controlled/living radical polymerization in aqueous media: homogeneous and heterogeneous systems 总被引:5,自引:0,他引:5
Jian Qiu Bernadette Charleux Krzysztof Matyjaszewski 《Progress in Polymer Science》2001,26(10):2083-2134
Controlled/living radical polymerizations carried out in the presence of water have been examined. These aqueous systems include both the homogeneous solutions and the various heterogeneous media, namely dispersion, suspension, emulsion and miniemulsion. Among them, the most common methods allowing control of the radical polymerization, such as nitroxide-mediated polymerization, atom transfer radical polymerization and reversible transfer, are presented in detail. 相似文献
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Submicron-sized poly(i-butyl methacrylate)-block-polystyrene particles were successfully prepared by two-step atom transfer radical polymerization (ATRP) in aqueous media: ATRP in miniemulsion (miniemulsion-ATRP) followed by ATRP in seeded emulsion polymerization (seeded-ATRP). When PiBMA particles, which were prepared by the miniemulsion-ATRP process with polyoxyethylene sorbitan monooleate (Tween 80, nonionic emulsifier) of 6-10 wt % based on iBMA, were used as seed in the seeded-ATRP of styrene, the block copolymer particles having narrow molecular weight distribution and pre-determined molecular weight were prepared at high conversion. Some block copolymer particles had an ‘onion-like’ multilayered structure. In this way, controlled/living free radical polymerization can be employed to obtain unique particle morphologies that may not be easily accessible using conventional free radical polymerization. 相似文献
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Krzysztof Matyjaszewski 《Israel journal of chemistry》2012,52(3-4):206-220
Atom transfer radical polymerization (ATRP) is currently one of the most often used synthetic polymerization methods to prepare well-defined polymers with complex architecture. This review covers some fundamentals of copper-based ATRP, presents basic structure–reactivity correlation for initiators and catalyst complexes and discusses the radical nature of reactive intermediates. New ATRP initiating processes with ppm amounts of copper catalysts and various reducing agents are described together with recent electrochemically controlled ATRP and polymerization in aqueous homogeneous and dispersed media. Examples of polymers with precisely controlled architecture are presented together with the effect of variable amounts of catalysts on molecular weight distribution and morphology of nanostructured block copolymers. Some current and forthcoming applications of polymers made by ATRP are presented. 相似文献
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考察了原子转移自由基聚合(ATRP)乳液聚合中的三类催化体系CuCl/bpy、CuC/bde、CuCl/dNbpy在油水两相中的浓度分配情况及对聚合反应的影响。结果表明:催化体系中配体疏水性的好坏影响其在油水两相中的浓度分配.并进一步影响聚合反应的可控性。dNbpy的疏水性明显优于bde和bpy.聚合反应具有典型的活性特征;而bpy、bde两种配体的聚合反应可控性较差。 相似文献