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聚甲醛的制备、特性及应用 总被引:11,自引:0,他引:11
介绍聚甲醛树脂的制备方法,包括均聚甲醛及共聚甲醛制备中的单体合成与精制、聚合物合成、聚合物热稳定化方法和原理,并介绍了聚甲醛树脂的特性和主要应用领域。 相似文献
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互穿聚合物网络讲座(连载六) 总被引:1,自引:0,他引:1
第六章IPN功能高分子材料1离子交换树脂(IER)在第一章里曾介绍过,Millar第一个使用了IPN的术语,认真地研究了聚苯乙烯/聚苯乙烯的Homo-IPNs,用来合成离子交换树脂的基质。从此以后,IPN离子交换树脂的理论和应用研究一直没有间断。1.1IPN离子交换树脂的分类根据IPN的结构,IPN离子交换树脂分成半-IPN和全-IPN两大类。1.1.1半-IPN离子交换树脂a两性IER-蛇笼IERHatch等首次报道了半-ⅠIPN蛇笼ⅠER[1],其中聚合物Ⅰ是交联的聚苯乙烯,聚合物Ⅱ是线性的聚丙烯酸。合成方法是用丙烯酸单体浸泡商业IER(如DowexA-… 相似文献
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一、前言 乳液聚合过程以水为反应介质,并加入乳化剂、稳定剂、引发剂和不饱和单体等,以自由基加成聚合方式合成高分子乳液。许多高分子材料都用乳液聚合方式生产,主要有丁苯橡胶、丁腈橡胶、氯丁橡胶及其胶乳、高分散性聚氯乙烯糊状树脂以及乳液型纺织印染粘合剂、皮革和造纸工业的表面涂饰剂、各种乳胶和建筑涂料等。本文主要讨论乳液聚合物中残留单体气味的消除方法。 相似文献
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对高吸水性树脂的发展历史、应用进行了综述.根据树脂来源的不同,将高吸水性树脂分为三大类:天然高分子系列、合成聚合物系列及复合型树脂,并对其合成方法作了详细的评述.最后展望了高分子吸水材料的发展趋势. 相似文献
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通过使用亚洲、欧洲(高加索)、非洲以及拉美(黑白混血)等不同人种头发做成Ω环状发束,再经定型聚合物定型,用质构分析仪对其进行力学性能测试,并应用环状材料弯曲受力的数学模型,分析了头发的形态结构对定型后的发束力学性能的影响。结果表明,不使用定型产品时,发束的力学性能与发丝粗细有关,发丝越粗,发束的力学性能越好。使用定型产品时,发束的力学性能与发丝粗细关系较小,而与排列层数有关。 相似文献
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对过去4年的头发定型剂和固定剂的发展情况作了综述,讨论了各公司的定型剂和固定剂品牌的概况,市场对定型剂和固定剂产品的需求不断增长.进一步讨论了定型剂和固定剂配方中所使用的聚合物和流变改性剂的发展情况.不断研发出许多新的聚合物和流变改性剂,推动了定型剂和固定剂市场向前发展. 相似文献
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From ion exchange resins to polymer‐supported reagents: an evolution of critical variables
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Spiro D Alexandratos 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2018,93(1):20-27
The concept of immobilizing ligands onto cross‐linked polymer supports is presented as an evolution of a concept that begins with ion exchange resins and evolves into ion‐selective polymers, polymer‐supported catalysts, and the general area of polymer‐supported reagents. Each of the four categories of polymers is defined by a set of major variables {electrostatic attraction (for ion exchange resins); steric, geometric, and electronic factors (for ion‐selective polymers); attracting and orienting reactants, and stabilizing the transition state (for polymer‐supported catalysts); and binding reactants with weak or strong forces (for polymer‐supported reagents)} and of minor variables {pH, concentration, competing ions, counterions, ionic strength, hydrophilic/hydrophobic interactions, hydration energies, and polymer crosslink level}. The rational design of each category will require identifying the relationships between major and minor variables and applying the principles inherent to complexity science will be an important focus of future research. © 2017 Society of Chemical Industry 相似文献
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Yangyang Wang Fei Fan Alexander L. Agapov Tomonori Saito Jun Yang Xiang Yu Kunlun Hong Jimmy Mays Alexei P. Sokolov 《Polymer》2014
Replacing traditional liquid electrolytes by polymers will significantly improve electrical energy storage technologies. Despite significant advantages for applications in electrochemical devices, the use of solid polymer electrolytes is strongly limited by their poor ionic conductivity. The classical theory predicts that the ionic transport is dictated by the segmental motion of the polymer matrix. As a result, the low mobility of polymer segments is often regarded as the limiting factor for development of polymers with sufficiently high ionic conductivity. Here, we show that the ionic conductivity in many polymers can be strongly decoupled from their segmental dynamics, in terms of both temperature dependence and relative transport rate. Based on this principle, we developed several polymers with “superionic” conductivity. The observed fast ion transport suggests a fundamental difference between the ionic transport mechanisms in polymers and small molecules and provides a new paradigm for design of highly conductive polymer electrolytes. 相似文献