超支化聚合物气体分离膜材料的研究进展

综述了超支化聚合物气体分离膜材料的研究进展,介绍了不同种类的超支化聚合物,阐述了传统结构超支化聚合物与大π共轭结构超支化聚合物的等超支化聚合物的合成,详细介绍了偶氮类超支化聚合物、聚酰胺类超支化聚合物及共混类超支化聚合物在分离膜制备中的作用,并对超支化聚合物在气体分离膜领域未来的研究方向进行了展望。     

超支化聚合物在共混改性中的应用

介绍了超支化聚合物的概况,综述了超支化聚苯、超支化聚酯、超支化聚酰胺、超支化聚醇和超支化聚苯乙烯等在聚合物共混改性中的应用。     

超支化聚合物

综述了超支化聚合物的发展历史和最新发展趋势。介绍了超支化聚合物与一般线形聚合物比较所具有的独特性能,各个组分对于超支化聚合物性能的影响以及超支化聚合物在各个领域的应用。     

两亲性超支化聚合物研究进展

介绍了两亲性超支化聚合物的合成方法,利用长链烷基和聚乙二醇对超支化聚合物端基接枝改性;或者对超支化聚合物改性引入活性位点,再利用其引发乙烯基单体,通过自由基聚合、开环聚合得到两亲性超支化聚合物。阐述了不同结构的两亲性超支化聚合物在溶液中的独特性质,如核壳型单分子胶束以及不同胶束形态的聚集体。详细介绍了两亲性超支化聚合物在药物输送载体、材料改性以及染料分子的封装等领域的应用现状,指出采用新的改性技术、聚合技术制备具有特殊性能的两亲性超支化聚合物以及探索其在生物医药领域的研究为今后的主要发展方向。     

超支化聚合物在涂料中的应用

介绍了超支化聚合物在涂料中的应用 ,包括超支化聚合物的特性以及可应用于涂料树脂的不同结构的超支化聚合物     

超支化聚合物增韧环氧树脂的研究进展

介绍超支化聚合物的结构及特点,着重综述了超支化聚合物增韧改性环氧树脂的研究进展,指出了超支化聚合物在环氧树脂改性方面的发展方向。     

新型共轭功能材料-超支化聚合物的研究进展

超支化共轭聚合物由子其所具有的良好的非线性光学特性,在功能高分子领域具有广泛的应用前景。重点介绍了超支化共轭材料的主要种类:超支化聚亚乙烯基苯类,超支化聚(β,β-二溴,4-乙炔基)苯乙烯类,超支化聚芳烃(HPA),超支化光学非线性类聚合物,超支化含香豆素类聚合物等,介绍了典型代表聚合物的制备方法和光学特性。     

新型超支化聚合物的合成及应用研究进展

主要介绍了含特殊结构基元的超支化聚合物和超分子超支化聚合物的合成方法,并综述了这些新型超支化聚合物在生物医学材料、光学材料、电学材料方面的应用研究进展。     

超支化聚(酰胺-酯)的合成及其光致变色性能研究

采用丁二酸酐、三羟甲基氨基甲烷为主要原料,在冰水浴条件下合成AB_3型单体,然后进行熔融缩聚制得超支化聚(酰胺-酯)(HBP);再将含羧基的螺吡喃光致变色基元通过反应活性基团羧基与AB_3超支化聚合物末端羟基的反应而引入到AB_3超支化聚合物末端上,得到具有光致变色性能的超支化聚合物(MHBP)。利用红外、核磁等对其结构进行了表征,利用紫外可见分光谱对超支化聚合物光致变色性进行了研究。结果表明:MHBP同时具有超支化聚合物的性能和光致变色性能。     

端羟基超支化聚合物的改性研究及其在涂料中的应用

端羟基超支化聚合物因其具有独特的结构与性能特点,目前在许多领域已经得到应用,是已经商业化的超支化产品之一。端羟基超支化聚合物的端羟基具有容易改性的特点,因此通过不同功能单体对羟基进行改性,可以赋予超支化聚合物不同的功能,以适应不同的应用领域。对端羟基超支化聚合物进行改性研究,以端羟基超支化聚合物为母体,接枝各种功能基团结构和功能元素,得到的改性产品具有特殊的性能,可以应用于多种涂料体系。     

超支化聚合物改性环氧树脂的研究进展

超支化聚合物因其独特的结构和性能特点,已在众多领域得到了广泛的应用,尤其是在热固性树脂的改性中的应用,可作为热固性树脂的增韧剂。该文介绍了环氧树脂的性能特点及应用,超支化聚合物的结构及特点,着重论述了近年来超支化聚合物在改性环氧树脂力学性能、固化行为及热性能方面的研究进展,并指出了超支化聚合物在环氧树脂和其它热固性树脂改性方面的发展方向。     

超支化聚合物及其在UV固化涂料中的应用

介绍了超支化聚合物的合成方法、特性及主要类型，综述了国内外在应用超支化聚合物制备UV固化涂料方面的研究进展，指出了目前超支化聚合物在UV固化涂料中应用存在的主要问题，并对其发展趋势进行了展望。     

A novel hyperbranched polyester functionalized with azo chromophore: synthesis and photoresponsive properties

Summary A hyperbranched polymer containing azo chromophores on the periphery has been synthesized from transesterification reaction between a hyperbranched polyester bearing peripheral hydroxyl groups and ethyl 4-{4'-[N, Ndi(hydroxyethyl)aminobutoxy]phenylazo}benzoate. The hyperbranched polyester was obtained by adding the AB₂ monomers step by step to a multifunctional core molecule. Narrow molecular weight distribution, with a polydispersity index as low as 1.1, was achieved by this method. The azobenzene- functionalized hyperbranched polymer as well as the corresponding azo monomer showed typical photoresponsive behavior of an azobenzene type molecule. The trans azobenzene units of the hyperbranched polymer could be reversibly switched by UV irradiation to the cis form that recovered slowly to the trans form in the dark. However, significantly less conversion from the trans isomer to the cis isomer was observed for the azobenzenefunctionalized hyperbranched polymer at the photostationary states under the irradiation of UV light, which could be attributed to the increased steric hindrance in the hyperbranched polymer. Received: 1 April 2002 /Revised version: 10 July 2002/ Accepted: 15 July 2002     

超支化聚酯在环氧树脂改性中的应用

超支化聚合物是一类具有三维树形结构的高度支化的大分子。由于其独特的结构和性能以及可实现工业化生产的潜力,超支化聚合物已经成为高分子材料领域研究的热点之一,并且得到了越来越多的关注。作为一类非常重要的超支化聚合物,超支化聚酯(HBPE)引起了研究人员的极大兴趣。目前,HBPE已经在众多领域获得应用,特别是在环氧树脂改性中的研究发展迅速。综述了HBPE作为改性剂在环氧树脂中的应用研究进展,同时对HBPE在环氧树脂和其他热固性树脂改性中的应用研究方向作了展望。     

超支化聚合物在环氧树脂中的应用

综述了超支化聚合物在环氧树脂中的应用,简述了超支化环氧树脂、超支化环氧树脂固化剂和超支化环氧树脂添加剂的合成及应用进展,展望了其研究前景。     

Synthesis and characterization of solvent-free hybrid alkyd resin with hyperbranched melamine core

In this study, a new hybrid alkyd resin was formulated using melamine-based hyperbranched polymer having 24 hydroxyl groups on its structure and relatively low molecular weight alkyd. The alkyd was synthesized using an oil mixture (40% linseed + 60% sunflower). Melamine was used as the core molecule for the hyperbranched polymer due to its excellent properties such as greater hardness, alkali and solvent resistance, and thermal stability. Melamine was first hydroxylated using formaldehyde and changed into hexamethylol melamine. This product was then twice hydroxylated with dimethylol propionic acid to obtain a hyperbranched polymer with 24 hydroxyl end groups. It was then reacted with low molecular weight alkyd resin at different proportions. The product had a low viscosity and could easily flow like oil. It is a solvent-free and water-free liquid. The ‘hyperbranched polymer/alkyd’ ratio affected physical properties of the liquid polymer and also the mechanical properties of the hardened polymer, which can be used for surface coating. The viscosity of the liquid resin decreases from 148 to 8.84 Pa.s as the hyperbranched-polymer-to-alkyd ratio is decreased from 1:3 to 1:24. On the other hand, the hardness of heat-treated resin decreases from 198 Persoz to 43 Persoz, respectively. That is, the increase in the amount of hyperbranched polymer in the resin increases hardness, whereas the increase in the amount of alkyd decreases it. The mechanical tests of hardened resins showed that all specimens passed conical mandrel bending test, and they all depicted high adhesion, and high abrasion and impact resistance. The specimens also had excellent gloss properties.     

Preparation and characterization of a hyperbranched polyethoxysiloxane based anti‐fouling coating

A hyperbranched polyethoxysiloxane was synthesized via hydrolytic polycondensation between methyltriethoxysilane (MTES) and tetraethoxysilane (TEOS), with hydrochloride acid as catalyst. FTIR, ¹H NMR, ²⁹Si NMR, and GPC measurements confirmed that the polyethoxysiloxane synthesized was indeed a hyperbranched polymer with a degree of branching of 0.67. It was also found that there were no silanol groups in polymer matrix. This quality can effectively enhance its storage stability. Based on the hyperbranched polyethoxysiloxane, a novel antifouling coating with high curing speed at ambient temperature was developed. The recipe and other technique parameters of the coating were revealed and investigated. Experiments indicate that the coating performs well as an antifouling agent and can be applied to various ceramic products. By using scanning electron microscope (SEM) to inspect the surface of a polished tile applied with the coating, the antifouling mechanism was studied and the results were explained in accordance with the penetrating and crosslinking of the macromolecules of hyperbrached polyethoxysiloxane into the microdefects on the surface of tiles. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5818–5824, 2006