超细SiO2微粒的表面接枝聚合改性研究进展

综述了超细SiO2微粒表面接枝聚合改性技术的原理以及近年来超细SiO2微粒表面接枝聚合改性的研究进展。讨论了自由基、阳离子和阴离子接枝聚合改性的优缺点。着重介绍了一种极具发展前景的接枝聚合改性方法——ATRP技术。     

原子转移自由基方法合成聚合物刷的研究进展

从聚合物刷基底的选择和聚合方法的优化两方面介绍了原子转移自由基聚合方法合成聚合物刷的研究进展,讨论了聚合物刷在图案化材料表面、提高材料表面的生物相容性及其它方面的应用情况,并对其前景进行了展望.     

壳聚糖的自由基聚合修饰改性

综述了普通自由基聚合和原子转移自由基聚合(ATRP)反应对壳聚糖及其衍生物进行修饰改性的研究现状。着重介绍了ATRP技术在壳聚糖接枝改性方面的应用。     

MWNT-g-PBA的制备及对PVC的改性

采用原子转移自由基聚合(ATRP)方法在多壁碳纳米管(MWNT)表面接枝聚丙烯酸丁酯(PBA),制备得到PBA接枝MWNT(MWNT-g-PBA),并以此对聚氯乙烯(PVC)行改性。红外光谱(FTIR)及射电子显微镜(TEM)分析结果表明,采用ATRP法成功地将PBA接枝到MWNT的表面。采用熔融共混法制备了PVC/MWNT-g-PBA复合材料,对其力学性能和耐热性能进行了研究。结果表明,MWNT-g-PBA可以显著提高复合材料的拉伸强度和冲击强度,同时复合材料的耐热性能并未受到较大影响。     

原子转移自由基聚合研究进展

综述了原子转移自由基聚合的研究进展。     

原子转移自由基聚合研究进展

原子转移自由基聚合(ATRP)反应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聚合物.介绍了ATRP的研究进展,包括ATRP反应的特点、聚合反应机理、应用、研究现状及前景展望.     

ATRP法制备纳米SiO2-g-PBA及其对POM改性

采用原子转移自由基聚合(ATRP)法在纳米二氧化硅(Si02)粒子表面接枝聚丙烯酸丁酯(PBA),产物为纳米siO2-g-PBA,采用透射电镜(TEM)、偏光电子显微镜(PLM)等手段研究了纳米SiO2及纳米SiO2-g-PBA复合粒子的添加对聚甲醛(POM)结晶性能及热稳定性的影响.结果表明.采用ATRP法有少量的PBA接枝了:纳米SiO2表面,且该粒子在POM中分散均匀;纳米SiO2及纳米SiO2-g-PBA复合粒子的添加不改变POM的晶型,但POM的晶粒尺寸变小.a纳米SiO2-g-PBA复合粒于的异相成核作用较纳米SiO2明显;纳米SiO02及纳米Si2-g-PBA复合粒子使POM的结晶温度升高,熔点升高,结晶度升高.纳米SiO2及纳米SiO2-g-PBA复合粒子的添加使得POM的热稳定性得到了提高.且纳米SiO2-g-PBA复合粒子的作用更明显.     

原子转移自由基乳液聚合研究进展

原子转移自由基聚合(ATRP)作为一种可控/活性聚合方法,可对聚合物结构进行精确控制;乳液聚合以水作为分散介质,具有经济、环保等特点。因此,乳液ATRP结合了两者的优点,具有工业化生产的潜力。首先分析了影响乳液ATRP的各种因素,然后综述了正向ATRP、RATRP(反向ATRP)、SR&NI ATRP(正向/反向同时进行的ATRP)和AGET ATRP(电子转移活化剂ATRP)等机制及研究进展,最后对乳液ATRP的发展方向进行了展望。     

活性自由基乳液聚合的研究进展

活性自由基乳液聚合是一个非常新的研究领域。介绍了目前活性自由基乳液聚合领域的3种常用的方法及应用这些方法进行乳液聚合的研究进展,包括:原子转移自由基聚合(ATRP),氮氧调节自由基聚合(NMP)和可逆加成-断裂链转移自由基聚合(RAFT)。     

离子液体在原子转移自由基聚合反应中的研究进展

作为一种新型环境友好的"绿色溶剂",室温离子液体已逐步被人们认识和接受。近年来人们将之应用在聚合反应中的研究越来越多,特别是近年发展起来的原子转移自由基活性聚合反应中,使用离子液体不仅可以增大聚合速率和分子量,而且有助于催化剂与聚合物的分离。本文根据近几年的文献资料,阐述了原子转移自由基聚合机理以及离子液体在其中的应用。     

聚氯乙烯耐热改性的研究进展

介绍了提高PVC耐热性的几条途径,如交联、卤化、共混、共聚等,尤其是N-取代马来酰亚胺改性PVC树脂,既能显著提高PVC的耐热性,又有较好的冲击性能。     

原子转移自由基法合成乙丙橡胶接枝物中的热聚合研究

采用原子转移自由基聚合法(ATRP)合成了三元乙丙橡胶与苯乙烯的接枝共聚物(EPDM-g-St),动力学研究表明聚合过程为“活性”聚合。在接枝聚合过程中发现了明显的苯乙烯热聚合现象。对接枝聚合中得到的均聚苯乙烯进行表征的结果表明,苯乙烯在ATRP接枝体系中的热聚合过程在一定程度上受到ATRP机理的控制;升高温度和延长反应时间使得热聚合更为显著。     

反向原子转移自由基聚合研究进展

原子转移自由基聚合是一种新兴的活性/可控聚合方法,而反向ATRP又是在传统ATRP方法基础上衍生出的一种摒弃ATRP方法中一些缺点的新生活性聚合方法。文中介绍了反向ATRP的建立原理,从单体、引发剂、催化体系等方面综述了反向ATRP的研究进展。     

Surface modification of natural substrates by atom transfer radical polymerization

Surface modification of various solid polysaccharide substrates was conducted by grafting methyl acrylate (MA) and styrene via atom transfer radical polymerization (ATRP) to produce well‐defined polymer grafts. The hydroxyl groups on the surfaces of the substrates were reacted with 2‐bromoisobutyryl bromide followed by graft copolymerization under ATRP conditions. The studied substrates were filter paper, microcrystalline cellulose, Lyocell fibers, dialysis tubing, and chitosan films. The modified substrates were analyzed by FT‐IR, water contact angle measurements, TGA, and SEM. FT‐IR characterization of the grafted substrates showed significant differences between the different substrates in the amount of grafted polymer. Higher amounts of polymer seem to be possible to graft from native cellulose substrates than from regenerated cellulose substrates. To investigate whether the grafted polymers were “living” after a longer time period, a second layer of polystyrene was grafted from a filter paper modified with PMA one year ago. FT‐IR characterization of the filter paper showed a peak corresponding to styrene, indicating that a block copolymer had been formed on the surface. Graft copolymerization can be used to change and tailor the surface properties of the polysaccharide substrates. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4155–4162, 2006     

全丙烯酸酯嵌段共聚物热塑性弹性体合成研究进展

作为一类新型的热塑性弹性体,全丙烯酸酯嵌段共聚物越来越引起人们的注意。主要介绍全丙烯酸酯嵌段共聚物的合成进展,分别介绍了阴离子聚合、基团转移聚合、稳定氮氧自由基聚合和原子转移自由基聚合在合成全丙烯酸酯嵌段共聚物热塑性弹性体中的应用,并对其前景进行了展望。     

The research of RATRP of styrene in the microemulsion

In this paper, the reverse atom transfer radical polymerization of styrene in microemulsion was studied and some small molecular electrolyte was introduced into the microemulsion to limit the content of transition‐metal in the aqueous medium by salt effect and to control the molecular weight well ulteriorly. The polymerization was carried out at 80°C, with a mechanical agitator, using 2,2′‐A20‐bisbutyro‐nitrile (AIBN) as initiator and CuCl₂/bpy as catalyst, under N₂ atmosphere. Effects of the mole ratio of AIBN/CuCl₂/bpy, the kind and content of small molecular electrolyte on the molecular weight of the polymers, and convention of the monomer were investigated through viscosity measurement, gel permeation chromatography, and transmission electronic microscope. The results show that adding CuCl₂/bpy to the reactive system could control the increase of the molecular weight and the conversion effectively. The molecular weight and conversion would decrease with the increase of amount of CuCl₂. When the mole ratio of AIBN/CuCl₂/bpy is 1:2:6, the molecular weight is no more than 18 × 10⁴. Adding NaCl or NaBr could make the molecular weight and conversion decrease too. A linear relationship between the molecular weight and the conversion can be obtained when the amount of NaCl or NaBr reaches 1.0% to water. The distribution index of molecular weight of the system with NaCl is narrower than that of system without NaCl. What's more, latex particles' shape is spherical whose diameter is from 10 to 100 nm. All researches we have laid a foundation for further study. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1093–1099, 2006     

Synthesis of conductive PSt-g-PANi/TiO2 nanocomposites by metal catalyzed and chemical oxidative polymerization

Well-defined polymer-TiO₂ nanocomposites of core–shell structure were prepared by two-steps, surface-initiated atom transfer radical polymerization (ATRP) of styrene and in situ chemical oxidative polymerization of aniline monomers from the surfaces of the TiO₂ nanoparticles. The methods used include the following: initially, the ATRP initiator was covalently attached to the surface of TiO₂ nanoparticles by esterification of 2-bromo-2-methyl propionic acid with hydroxyl group. The metal-catalyzed radical polymerization of styrene with modified TiO₂ nanoparticles was performed using a copper catalyst system to give the TiO₂-based core hybrids linking PSt segments (TiO₂-PSt hybrids). Next, the TiO₂-PSt reacted with HNO₃/H₂SO₄ to produce a nitro group containing polystyrene to form TiO₂-PSt-NO₂, and obtained TiO₂-PSt-NO₂ was treated with hydrochloric acid/SnCl₂, and converted to an amine group containing polystyrene (TiO₂–PSt-NH₂). Finally, surface oxidative graft copolymerization of aniline, using the –NH₂ moieties of TiO₂/PSt-NH₂ as the anchoring sites. Characterization of these well-defined nanocomposites included FTIR, thermogravimetric analysis, transmission electron microscopy, and X-ray diffraction.     

高聚合度聚氯乙烯树脂及其加工、改性的研究进展

高聚合度聚氯乙烯（HPVC）树脂是一种机械力学性能优异的新一代聚氯乙烯（PVC）树脂，文中叙述了HPVC的合成工艺方法，加工工艺条件；介绍了HPVC的机械力学性能，耐热性，高弹性等，并探讨了相关的结构与性能的关系；例举了各种高分子改性剂对HPVC的改性研究，并对此进行了展望。