脂肪族超支化聚酯在涂料中的应用研究进展

脂肪族超支化聚酯因其独特的结构和性能特点,成为目前商业化生产的超支化聚合物之一,已在众多领域获得应用,特别是在涂料工业领域的应用发展迅速.本文综述了脂肪族超支化聚酯在高固体分涂料、UV固化涂料和其他类型涂料中的应用研究进展,同时对超支化聚酯今后的研究方向作了展望.     

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。     

超支化聚酯的改性与应用研究

超支化聚合物是一种具有发展前途的新材料,但是由于其自身端基的限制,其性能发挥会受到影响。因此,充分了解超支化聚合物的端基构成,并积极对其进行改性研究,可以实现超支化聚合物的性能改变,并由此提升其应用范围和应用效果。本文就超支化聚酯的改性进行应用研究,主要是利用实验的方式来进行超支化聚酯改性过程以及结果的分析,从而为超支化聚合物的改性实践做出指导。     

端基对脂肪族超支化聚酯性能的影响

用十八酸对端羟基脂肪族超支化聚酯进行改性,采用差示扫描量热分析(DSC)、热重分析(TG)、旋转流变仪研究了不同端基对超支化聚酯的玻璃化转变温度、热稳定性和流变性能的影响.结果表明,端基对超支化聚合物的玻璃化转变和结晶有显著影响,通过端基长链烷烃链段的有序排列可以显著提高超支化聚合物的结晶性能;端羟基超支化聚酯的热分解...     

国内文献摘要

正一种两嵌段聚乙烯基超支化聚合物及其制备方法和应用本发明涉及高度支化聚合物的制备技术领域,具体涉及一种两嵌段聚乙烯基超支化聚合物及其制备方法和应用,其制备方法,包括两个步骤:一、制备末端羟基聚乙烯共聚物;二、制备两嵌段聚乙烯基超支化聚合物。本发明设计合成聚乙烯-超支化嵌段聚合物,一段为线性聚乙烯链,另一段为超支化聚合     

超支化聚合物的制备及其应用

超支化聚合物由于具有独特的结构和性能而成为研究热点之一.介绍了超支化聚合物的制备方法,主要有缩聚反应、加成反应、开环聚合、接枝反应等.论述了超支化聚合物的研究应用情况,如合成嵌段共聚物、用于聚合物的增韧、药物缓释剂等.     

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。     

核分子比例对超支化聚酯结构和涂膜性能的影响

以双季戊四醇为核,二羟甲基丙酸为单体合成了不同代数的超支化聚酯。采用了IR、GPC、13C NMR、DSC和化学滴定等方法对产物进行了表征和分析。试验结果表明聚合物具有较小的多分散性指数(拟两代超支化聚酯M—w/M—n=1.159,拟四代超支化聚酯M—w/M—n=1.028)。通过聚合物的13C NMR分析了超支化聚酯的支化度,表明在超支化聚酯中,端羟基的反应活性大于线性单元中羟基的活性。并用油酸对聚合物进行改性,研究了固含量与黏度的关系及其涂膜的性能;结果表明该树脂具有良好的成膜性和涂膜性能。     

超支化聚合物的制备方法研究现状及发展趋势

从多方面综述了超支化聚合物近些年来的研究现状以及其在生物应用、治疗和诊断、基因转染、组织工程和涂料应用等领域所发挥的重要作用,并重点对超支化聚合物常见的几种制备方法,例如缩聚法、开环聚合法和活性聚合法等进行了多方面优缺点的分析对比,同时对一些新兴的制备方法进行了总结。还对超支化聚合物未来的发展趋势与潜在价值进行了分析,并对当前超支化聚合物应用研究仍存在的技术难题的解决方法提出了意见与建议。     

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。     

超支化大分子的最新应用进展

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。     

超支化聚氨酯的现状及发展动态

超支化聚合物由于其特殊的结构和由此产生的独特的物理化学性质,成为了高分子学科研究的热点之一。对超支化高分子的研究已经从合成及对物理化学性质的研究发展到分子理论研究、各种功能化以及应用方面的初步探索。本文详尽分析了超支化聚氨酯的不同合成方法,并指出了超支化聚氨酯应用研究的主要方向。     

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。     

超支化聚合物及其自组装研究进展

介绍了超支化聚合物的结构性质特点及合成方法,主要有缩聚反应、乙烯基自缩合反应(SCVP)、开环聚合等;概述了超支化聚合物的自组装及其应用研究情况,如在生物医药、修饰碳纳米管及其它领域的实际应用现状。     

Phase behavior of hyperbranched polymer solutions in mixed solvents

Hyperbranched polymers get more and more interesting for several applications due to their tailor-made properties influenced by the architecture and the functional groups of the polymer. The liquid–liquid phase behavior of hyperbranched polymer solutions is an important issue for various applications. Until now, the calculations of these phase equilibria are limited to solutions of hyperbranched polymers in a single solvent using Lattice Cluster theory (LCT). The LCT permits the incorporation of the architecture of the polymer directly in thermodynamic properties, as the Helmholtz energy, without any additional adjustable parameter.This papers aims at the extension of the LCT to ternary systems made from hyperbranched polymer (Boltorn H20), water and propanol. The derived expression for the Helmholtz energy allows for the first time the prediction of miscibility gaps in the ternary system based on experimental data of the binary subsystems.Additionally to the architecture of hyperbranched polymers also the functional groups of hyperbranched polymers play an important role in phase equilibrium. In order to include the association phenomena in the theoretical framework, a modified version of the Wertheim association theory is used. However, during the application of this approach the model lost its predictive power, because ternary data must be used for the parameter estimation procedure. Nevertheless, the combined theory is able to model the experimental phase behavior within the experimental accuracy.     

超支化聚氨酯的合成方法及其应用

超支化聚氨酯由于具备特殊的结构而具有独特的化学与物理性质,吸引了越来越多研究者的关注,本文将介绍常见的三种合成方法：（1）反应官能团同单体法;（2）反应官能团异单体法;（3）异体超支化核合成法。同时对超支化聚氨酯的主要应用领域进行简要的介绍。     

Synthesis and conductivity performance of hyperbranched polymer electrolytes with terminal ionic groups

Hyperbranched polymer was synthesized from pentaerythritol (as the central core), 1,2,4‐trimellitic anhydride, and epichlorohydrin, and then hyperbranched polymer electrolytes with terminal ionic groups were prepared by the reaction of hyperbranched polymer with N‐methyl imidazole. The chemical structure, thermal behavior, and ionic conductive property of the hyperbranched polymer electrolytes were investigated by ¹H‐NMR, FTIR, differential scanning calorimetry, thermogravimetric analyzer, and complex impedance analysis, respectively. The ionic conductivity of hyperbranched polymer electrolyte was up to 2.4 × 10^?4 S cm^?1 at 30°C. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Surface‐modified long‐chain branching hyperbranched polymer for postsurgical anti‐adhesion applications

Hyperbranched polyurethanes with various lengths of linear segments between two branching points were synthesized by an A2 + B3 polymerization approach, where A2 is an aliphatic diisocyanate and B3 is a triol with three poly(ethylene glycol)–polycaprolactone diblock chains. The influences of the A2/B3 monomer ratio and the segment length on the gel point and thermal properties of the polymers were investigated. Crystallization behavior of the hyperbranched polymers can be controlled by tuning the segment length between two branching points. Surface restructuring is observed after oxygen plasma treatment because of the temperature effect and preferential etching effect. The effects of oxygen plasma treatment on the surface morphology, surface energy, surface chemical properties and postsurgical anti‐adhesion properties of hyperbranched polymer films were studied .     

Behavior of hyperbranched polymers in solutions

Hyperbranched polycarbosilanes are investigated by the methods of molecular hydrodynamics and optics. Dependences of the hydrodynamic and conformational properties of these polymers on their molecular mass, the length of linear chains between branching points, and the chemical structure of end groups are analyzed. The hydrodynamic behavior of hyperbranched polycarbosilanes is explained by the fact that the dimensions of their macromolecules are compact and their shape is close to spherical. The convolution of chains between branching points becomes more pronounced with an increase in their length and a decrease in the molecular mass of the polymer. When end fluorinated groups are incorporated into the hyperbranched polycarbosilane, in thermodynamically good solvents and θ solvents, hydrodynamic characteristics change apparently owing to a change in the density of macromolecules in solution. In a poor solvent, the compaction of fluorinated macromolecules and a reduction in their shape asymmetry are observed. At a fixed branching degree, the hydrodynamic properties of hyperbranched polymers depend on the structural regularity of their macromolecules: In terms of hydrodynamic properties, the hyperbranched polycarbosilane with a degree of branching of 1 and a random distribution of branching points within the volume of a macro-molecule is appreciably different from a dendrimer of the same chemical nature and is close to polycarbosilanes with a degree of branching of 0.5.