淀粉接枝丙烯酸制备高分子灭火剂

.以淀粉/丙烯酸为原料,用二乙烯苯为交联剂,过硫酸钾和亚硫酸氢钠为引发体系.经接枝共聚制备淀粉/丙烯酸高吸水性树脂,再由高吸水性树脂制取高分子灭火剂.本文分析了交联剂用量、引发体系配比、单体中和度以及淀粉与单体配比等因素对吸水率的影响,并考察了高分子灭火剂的灭火性能.实验证明高吸水性树脂可吸蒸馏水600g/g,用它配制的高分子灭火剂是自来水灭火效能的14倍.     

新型高分子水系灭火剂的制备及其灭火性能研究

以玉米淀粉、丙烯酸为原料,过硫酸铵为引发剂,经接枝共聚,制备了高吸水性树脂,再利用高吸水性树脂制得高分子灭火剂,并测试了其灭火性能。结果表明,所制备的高吸水性树脂每克可吸水300g,用它配制的高分子灭火剂的灭火效能优于普通水的灭火效能,而且不易复燃。     

淀粉接枝丙烯酸制备高分子灭火剂

以淀粉／丙烯酸为原料，用二乙烯苯为交联剂，过硫酸钾和亚硫酸氢钠为引发体系．经接枝共聚制备淀粉／丙烯酸高吸水性树脂，再由高吸水性树脂制取高分子灭火剂．本文分析了交联剂用量、引发体系配比、单体中和度以及淀粉与单体配比等因素对吸水率的影响，并考察了高分子灭火剂的灭火性能．实验证明高吸水性树脂可吸蒸馏水600g／g，用它配制的高分子灭火剂是自来水灭火效能的14倍．     

甲醛改性高吸水性树脂的合成和性能研究

以硫酸饰铵为引发剂,在甲醛存在下,将马铃薯淀粉与丙烯腈接枝共聚合,经皂化后制得了甲醛改性高吸水性树脂。本文研究了该树脂的吸水性与甲醛、丙烯腈、糊化水和皂化的碱用量以及反应温度和时间的关系。实验结果表明,制得的高吸水性树脂具有良好的吸水速率。     

高吸水性树脂

本文介绍了高吸水性树脂的合成、应用以及它的吸水性机理和影响吸水性能的困素。高吸水性树脂是一种很有发展前途的新型功能高分子材料,在农林、园艺、食品工业、医疗医药、生理卫生、日用化学品式业和建筑工业等有广泛应用前景。     

高吸水性树脂的研究与进展

全面介绍了国内外高吸水性树脂的研究概况．论述了高吸水性树脂的合成方法、吸水机理与应用，并结合目前国内的发展状况，提出了今后我国高吸水性树脂的研究与发展方向．     

丙烯酸制备高吸水性树脂及其性能研究

本文介绍了新型化工材料高吸水性树脂脂近几十年来国内外的发展状况,并以丙烯酸采用反相悬浮合成聚丙烯酸高吸水性树脂为例,研究了反应单体浓度、丙烯酸中和度、溶剂及反应温度对高吸水性树脂的吸水性能的影响。     

高吸水性树脂在农林业上应用的研究进展

本论述简要论述了高吸水性树脂的制备过程、吸水机理及影响因素。全面介绍了国内外高吸水性树脂在农林业上的应用研究。并结合实际提出今后高吸水性树脂在农林业应用上的发展动向。     

棉短绒纤维制备高吸水性树脂研究

采用溶液聚合法,以天然植物资源棉短绒纤维为原料,经醚化制得羧甲基纤维素(CMC),然 后与丙烯酸(AA)及丙烯酰胺(AM)接枝共聚,最后经N,N-亚甲基双丙烯酰胺(MBAA)交联制备得到高吸水性树脂（SAP）。制备的高吸水性树脂吸收 去离子水的能力超过2500倍,吸收质量分数为09％的生理盐水高达310倍左右,高吸水性树脂经充分吸收润涨后呈透明的胶状物质。     

关于高吸水性树脂的研究

高吸水性树脂简称SAR,是一种典型的功能高分子材料,它能迅速吸收和保持自身质量几百倍甚至上千倍的水份,被冠予“超级吸附剂”的桂冠。本文概述了高吸水性树脂的几个方面：吸水、保水原理,分类,合成方法,应用以及研究方向。     

Post-treatments of Super Absorbent Polymer

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高强度超强吸水剂研究

采用低温下引发 ,高温下聚合和干燥产品的新实验方法 ,通过对影响该反应的主要因素如引发反应温度、聚合及产物干燥温度 ,单体、引发剂及交联剂质量分数以及中和度等系统地考察 ,制得了高强度超强吸水剂——交联聚丙烯酸钠 .该吸水剂吸水率高 ,且具有很好的凝胶强度     

聚丙烯酸钠高吸水树脂合成及尿素控释性研究

利用新型交联剂制备了聚丙烯酸钠高吸水性树脂,研究考察了交联剂种类及用量、引发剂用量、丙烯酸中和度以及反应时间等因素对高吸水性树脂溶胀率及溶解率的影响,得到了制备高溶胀率、低溶解率产物的最佳反应条件:交联剂用量0.08%(占丙烯酸单体的质量分数,下同),引发剂用量0.10%,丙烯酸的中和度60%,反应时间10 h.同时利用高吸水性树脂凝胶作为尿素控制释放基质,考察了高吸水树脂交联度、中和度等因素对尿素控制释放速率的影响.     

Preparation and Properties of Cellutose-Alginic Acid Interpolymeric Complex Films

1 Introduction General synthetic polymers such as polyethylene, polyvinyl chloride, polystyrene etc. have been produced and used in large quantities. They are very cheap, but their wastes are difficult to decompose in nature so to cause environmental pollution .In order to overcome such disadvantage, various kinds of biodegradable synthetic polymers such as polyactic acid, aliphatic polyester, polyvinyl alcohol complexes etc. have been researched~([1]). However, they are expensive, so cannot b…     

微波辅助聚(丙烯酸-丙烯酰胺)/沸石高吸水复合材料的制备及性能

利用微波辅助合成聚(丙烯酸-丙烯酰胺)/沸石高吸水复合材料,研究丙烯酰胺用量、引发剂、交联剂、中和度以及沸石的添加量等对吸水倍率的影响,利用红外光谱分析高吸水材料的官能团.结果表明:当沸石、丙烯酰胺、引发剂和交联剂量分别为丙烯酸单体质量的30%、40%、0.2%和0.04%,中和度为70%时,复合材料对自来水的吸附倍率达413 g/g,对生理盐水溶液的吸水倍率达95 g/g.     

Collapse of stiff conjugated polymers with chemical defects into ordered, cylindrical conformations

The optical, electronic and mechanical properties of synthetic and biological materials consisting of polymer chains depend sensitively on the conformation adopted by these chains. The range of conformations available to such systems has accordingly been of intense fundamental as well as practical interest, and distinct conformational classes have been predicted, depending on the stiffness of the polymer chains and the strength of attractive interactions between segments within a chain. For example, flexible polymers should adopt highly disordered conformations resembling either a random coil or, in the presence of strong intrachain attractions, a so-called 'molten globule'. Stiff polymers with strong intrachain interactions, in contrast, are expected to collapse into conformations with long-range order, in the shape of toroids or rod-like structures. Here we use computer simulations to show that the anisotropy distribution obtained from polarization spectroscopy measurements on individual poly[2-methoxy-5-(2'-ethylhexyl)oxy-1,4-phenylenevinylene] polymer molecules is consistent with this prototypical stiff conjugated polymer adopting a highly ordered, collapsed conformation that cannot be correlated with ideal toroid or rod structures. We find that the presence of so-called 'tetrahedral chemical defects', where conjugated carbon-carbon links are replaced by tetrahedral links, divides the polymer chain into structurally identifiable quasi-straight segments that allow the molecule to adopt cylindrical conformations. Indeed, highly ordered, cylindrical conformations may be a critical factor in dictating the extraordinary photophysical properties of conjugated polymers, including highly efficient intramolecular energy transfer and significant local optical anisotropy in thin films.     

高性能高分子材料：从基础走向应用

 自20世纪初提出高分子的概念以来,高分子材料越来越多地走进人们的生活,成为材料科学中最具代表性和发展前途的一类材料。高分子材料现已成为现代工业和高新技术产业的重要基石,与材料科学、信息科学、生命科学和环境科学等前瞻领域的交叉与结合,对推动社会进步、改善人们生活质量发挥了重要的作用。本文从通用高分子、生物医用高分子及能源高分子等应用于不用领域的高性能高分子材料出发,简述其发展历程和应用前景,并指出其发展对国民经济水平提高的促进作用。     

Recent progresses of polymer crystallization studied by AFM

The crystallization of polymers has been one of the major topics in polymer physics. Spherulites are common crystalline structures observed in semi-crystalline polymers. Many studies[1-5] have been performed to investigate the detailed structures and formation mechanisms. It is generally accepted that the three-dimensional geometry of spherulites develops from a stack of lamellae.     

高吸水保水材料研究现状及趋势综述①

高吸水保水材料作为一种新型的高分子功能材料，它具有能吸收自重几百倍至几千倍的水且加压下也不脱水或脱水很少的优异性能，因而在工业、农业、食品、建筑、日用化工等领域发挥着日益重要的作用。笔者基于对国内外相关文献资料的检索，从高吸水保水材料的类型、制备技术、性能三方面对研究现状进行了系统分析，对高吸水保水材料的发展趋势进行了探讨。     

Self-Assembled Conjugated Polymer Nanometer Scale Devices

1 Introduction Nanometer scale devices, as the next generation devices of electronics, have got a worldwide attention and rapid development recently. Simultaneously, conjugated polymers have been applied in organic electronics successfully because of their outstanding electronic-photonic properties. However, as far as we know few reports have dealt with the fabrication of nanometer scale devices by using conjugated polymers, although the combination of nanometer scale devices and polymers will…