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苏永锋 《化学推进剂与高分子材料》2010,8(2):38-41
概述了原子转移自由基聚合(ATRP)的机理及其在引发体系、单体、反应温度和介质等方面的进展;着重论述了ATRP在进行聚合物分子设计,制备具有特定结构的聚合物,如无规、梯度和交替共聚物,嵌段共聚物,末端官能团聚合物,接枝和梳状聚合物,星型高支化聚合物等方面的应用。 相似文献
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概述了原子转移自由基聚合(ATRP)在引发体系、反应温度、反应介质、实施方法等方面的进展;介绍了3种不同催化剂脱除技术;结合最新的研究成果,着重论述了ATRP在进行聚合物分子设计,制备窄分子量分布聚合物、无规、梯度和交替共聚物,嵌段共聚物,末端官能团聚合物,接枝和梳状聚合物,星型及高支化聚合物等方面的应用。 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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本文综述了采用原子转移自由基聚合(ATRP)法合成接枝共聚物的研究进展。主要从大分子引发剂法和大分子单体法两方面介绍了原子转移自由基聚合在合成接枝聚合物中的应用。 相似文献
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SBS/P(St-MMA)热塑性互穿聚合物网络结构与力学性能 总被引:1,自引:0,他引:1
采用原子转移自由基聚合(ATRP)法合成了苯乙烯一甲基丙烯酸甲酯共聚物[P(St-MMA)]。采用分步法制备了SBS/P(St-MMA)热塑性互穿聚合物网络(TIPN)。研究了P(St-MMA)质量分数、MMA/St(摩尔比,下同)和不同聚合方式对TIPN结构和力学性能的影响。结果表明:生成了具有较窄相对分子质量分布的P(St-MMA);P(St-MMA)质量分数在30%,左右时,采用ATRP法制备的SBS/P(St-MMA)TIPN拉伸强度和扯断伸长率达到最大;随MMA/St增加,TIPN拉伸强度增大,扯断伸长率不变。常规自由基聚合法制备的TIPN与ATRP法相比,前者相对分子质量高,相对分子质量分布宽,拉伸强度高,扯断伸长率随P(St-MMA)质量分数增加而下降。 相似文献
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接枝型高分子表面活性剂的合成、性质及应用 总被引:2,自引:0,他引:2
介绍了接枝型高分子表面活性剂的合成方法,包括缩聚法,加聚法及高分子化学反应法及其性质,诸如表面,等以及在造纸工业,石油开采,等方面的应用。 相似文献
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超支化大分子的最新应用进展 总被引:7,自引:0,他引:7
超支化大分子独特的构筑使其合成与应用在世界范围内受到人们越来越多的关注。笔者对最近以来国内外超支化大分子的最新应用进行了简要的综述,对今后超支化大分子的应用前景进行了展望和预测。 相似文献
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Jitapa Sumranjit 《Polymer》2007,48(19):5514-5519
The synthesis and characterization of a new segmented alternating copolymer is described, having monodisperse, partially methoxy-substituted bis-1,4-styrylbenzene chromophores linked with polyethylene glycol segments (average MW 1000) at the terminal aryl rings, so that the chromophore long axis lies along the polymerization vector. The product polymer is a blue-emitting material that is soluble in organic solvents and water. It is a waxy solid with a degree of polymerization of ∼3-6, a melting transition at 35 °C and good thermogravimetric stability up to 300 °C. It exhibits blue photoluminescence (PL) at 437 nm in chloroform, and at 445-465 nm in water, with relative PL quantum yields of 0.7 and 0.3, respectively. Its neat film luminescence maximum is 460 nm; solid state blending with PMMA blue shifts the emission to 440 nm at 10% polymer in PMMA. 相似文献
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Low crosslinked copolymer of linear and hyperbranched polyurethane (CHPU) was prepared, and the ionic conductivities and thermal properties of the composite polymer electrolytes composed of CHPU and LiClO4 were investigated. The FTIR and Raman spectra analysis indicated that the polyurethane copolymer could dissolve more lithium salt than the corresponding polymer electrolytes of the non crosslinked hyperbranched polyurethane, and showed higher conductivities. At salt concentration EO/Li = 4, the electrolyte CHPU30‐LiClO4 reached its maximum conductivity, 1.51 × 10?5 S cm?1 at 25°C. DSC measurement was also used for the analysis of the thermal properties of polymer electrolytes. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3607–3613, 2007 相似文献
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Viscoelastic and morphological properties of functionalized‐polymer‐modified asphalt, FPMA, have been described as function of number of epoxy groups presented in the functionalized polymer. At low temperatures, simple viscoelastic models can predict the elastic response of FPMA at short times and its viscous behavior at long times. The increase of epoxy groups yielded an increase on activation energy for viscous deformation of FPMA, and so, on its resistance to irreversible deformations under strain cycles. From ambient to higher temperatures, emulsion model can predict rheological properties of FPMA because they behave as viscoelastic emulsions. Modification of relaxation spectrum for FPMA due to the presence of a polymer network was not as strong as in normal PMA, thus, the rheological behavior of FPMA was found similar to systems having weak networks. However, the network became stronger as the number of epoxy groups was increased. This trend was verified by morphology of FPMA. Emulsion‐like structure was observed for all FPMA but differentiating each other by the polymer particle size. It was also observed that increase on epoxy groups, polymer particle size in the FPMA decreased, and higher stability at 180°C of FPMA was observed. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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The low elastic modulus and the ability to withstand high strain without failure make the conducting polymer attractive for a wide range of acoustic applications based on high‐strain electroactive polymers. In this article, we examine the electric and electromechanical performance of all‐polymer electromechanical systems, fabricated by painting conductive polyaniline (PANI) doped with camphor sulfonic acid (HCSA) on both sides of electrostrictive Poly(vinylidene fluoride‐trifluoroethylene) (P(VDF‐TrFE)) copolymer films, and compare them with those from the same copolymers with gold electrodes. The all‐polymer composite films are flexible, with strong coherent interfaces between the electrostrictive polymer layer and the conductive polymer layer. The electric performance such as dielectric properties and polarization hysteresis loops from P(VDF‐TrFE)/PANI film is nearly identical to those of P(VDF‐TrFE)/gold films in a wide temperature (from −50 to 120°C), and frequency range (from 1 Hz to 1 MHz). The all‐polymer systems also show a similar or even larger electric field induced strain response than that of films with electrodes under identical measurement conditions. The results demonstrate that the polyaniline/HCSA is good candidate material as the electrodes for electroactive polymers. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 945–951, 2000 相似文献
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The synthesis and solution properties of poly (1,1-diallyl-4-hydropiperazine dichloride) [poly(DAHPD)] ( 3 ), a dicationic polymer, and poly(1,1-diallylpiperazinium chloride), [poly(DAPC)] ( 4 ), a bifunctional polymer with trivalent and quaternary nitrogens, and their corresponding copolymers with sulfur dioxide, poly(DAHPD-SO2) ( 6 ) and poly(DAPC-SO2) ( 7 ), are discussed. Dicationic polymers ( 3 ) and ( 6 ) were found to have less pronounced polyelectrolyte effects than their monocationic counterparts ( 4 ) and ( 7 ). © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69:1329–1334, 1998 相似文献
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丙烯酸酯互穿网络聚合物的合成和性能 总被引:1,自引:0,他引:1
以十二烷基硫酸钠为乳化剂、丙烯酸乙酯为软单体、苯乙烯为硬单体 ,二乙烯基苯或三乙二醇二丙烯酸酯为交联剂 ,先以两步法合成软单体聚合物网络 ,随后加入硬单体溶胀并聚合。研究了软硬单体配比、交联剂和聚合条件对乳液聚合稳定性、放置稳定性和转化率等的影响 ,测定了互穿聚合物网络的 Tg和形态结构、加工和性能。结果表明 ,这种互穿聚合物网络为可以反复可塑加工、并具较高力学性能新型热塑性弹性体 相似文献
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Wei-Yun Ji Tian-Tian Li Si-Bo Cheng Lian-Fang Feng Xue-Ping Gu Cai-Liang Zhang Guo-Hua Hu 《American Institute of Chemical Engineers》2022,68(11):e17835
Reactive polymer blending is basically a flow/mixing-driven process of interfacial generation, interfacial reaction for copolymer formation, and morphology development. This work shows two antagonistic effects of flow/mixing on this process: while flow/mixing promotes copolymer formation by creating interfaces and enhancing collisions between reactive groups at the interfaces, excessive flow/mixing may pull the in situ formed copolymer out of the interfaces to one of the two polymer components of the blend, especially when the copolymer becomes highly asymmetrical. As such, the copolymer may lose its compatibilization efficiency. The mixing-driven copolymer pull-out from the interfaces is a catastrophic process (less than a minute), despite the high viscosity of the polymer blend. It depends on the molecular architecture of the reactive compatibilizer, polymer blend composition, flow/mixing intensity, and annealing. These findings are obtained using the concept of reactive compatibilizer-tracer and a model reactive polymer blend. 相似文献