乳液插层法制备丁苯橡胶/天然橡胶/蒙脱土纳米复合材料的研究

采用乳液插层法制备了丁苯橡胶/天然橡胶/蒙脱土（SBR/NR/MMT）纳米复合材料。采用透射电子显微镜研究了复合材料的亚微观形态,并对复合材料的性能进行了研究。透射电镜结果显示,制备出了插层型的SBR/NR/MMT复合材料。当蒙脱土含量较低时,SBR/NR/MMT纳米复合材料的力学性能随蒙脱土用量的增加而增大。SBR/NR/MMT复合材料的耐油性能随蒙脱土含量的增加而提高。蒙脱土的加入对纳米复合材料的耐磨性能没有太大影响。     

用乳液插层法制备丙烯酸丁酯/有机蒙脱土纳米复合材料

用乳液插层法制备了丙烯酸丁酯/有机蒙脱土纳米复合材料。先将钠基蒙脱土有机化,然后用乳液聚合法反应制得纳米复合材料。X射线衍射分析表明,蒙脱土有机化后层间距增大,季铵盐插层进入蒙脱土层间,乳液聚合后层间距进一步增大,聚丙烯酸丁酯插层到蒙脱土层间,得到丙烯酸丁酯/有机蒙脱土纳米复合材料。动态力学分析表明,复合材料的储能模量大大提高,损耗因子几乎不变。     

蒙脱土改性纳米复合乳液的研究进展

纳米技术是一项前沿科学技术,目前,聚合物,蒙脱土纳米复合材料是重要的工程材料之一。由于蒙脱土具有层状硅酸盐的特殊结构,使得聚合物,蒙脱土纳米复合材料的各项性能均得到较大改善。介绍了蒙脱土的特性及其复合材料的结构,详细介绍了近年来国内外学者采用共混法和插层聚合法制备蒙脱土改性纳米复合乳液所做的研究工作。对蒙脱土改性不同乳液的应用研究现状进行了综述。指出了乳液法制备聚合物／蒙脱土纳米复合材料研究中存在的问题和应努力的方向。     

乳液插层法制备丁苯橡胶/有机蒙脱土纳米复合材料中试研究

采用乳液插层法实现了SBR/OMMT纳米复合材料的产业化中试.其中试产品的TEM和XRD测试结果表明,SBR/OMMT复合材料是一种插层型纳米复合材料,该材料具有优异的力学性能.有机蒙脱土对橡胶大分子的限制作用使纳米复合材料的玻璃化转变温度升高,损耗模量提高.     

乳液插层法制备丁苯橡胶/有机蒙脱土纳米复合材料

对蒙脱土(MMT)进行了有机化改性,采用乳液插层法制备了丁苯橡胶(SBR)/有机蒙脱土(OMMT)纳米复合材料,用透射电子显微镜、X射线衍射法对OMMT及复合材料进行了表征,研究了复合材料的物理机械性能及动态力学性能.结果表明,MMT的层间距为1.47 nm,OMMT的层间距增大到2.94 nm;OMMT片层均匀分散在SBR基体中,具有良好的界面相容性;随着OMMT用量的增加,SBR/OMMT纳米复合材料的物理机械性能明显改善,且具有低填充量高增强效果的特点;SBR/OMMT纳米复合材料具有与SBR/炭黑N 330复合材料相当的抗湿滑性能,同时具有更小的滚动阻力.     

熔融插层法制备聚合物/蒙脱土纳米复合材料

综述了熔融插层法制备聚合物,蒙脱土纳米复合材料的新进展。熔融插层法制备聚合物,蒙脱土纳米复合材料具有设备简单、无单体限制和不需要溶剂的优点,并从热力学角度探讨了熔融插层法制备聚合物,蒙脱土纳米复合材料的不足以及改进措施。     

乳液插层法制备丁苯橡胶/蒙脱土纳米复合材料的结构与性能

选用一种能够在水中分散良好的有机改性蒙脱土（OMMT），采用乳液插层法制备了SBR／OMMT纳米复合材料，X射线衍射和透射电镜观察显示制得了半剥离型与插层型共存的纳米复合材料。研究了复合材料的力学性能和耐溶剂性能。测试结果表明，随着蒙脱土用量的增加，复合材料的定伸应力、拉伸强度和撕裂强度均大幅度提高。复合材料具有优异的耐溶剂性能。     

乳液插层共聚合成聚(苯乙烯-丙烯酸丁酯)/ 有机蒙脱土纳米复合材料

采用乳液插层聚合法合成聚(苯乙烯-丙烯酸丁酯)／有机蒙脱土纳米复合材料,研究了不同有机蒙脱土用量及其性能和反应条件对乳液共聚反应速率、单体转化率的影响,并提出一个乳液插层聚合法的简单模型。结果表明,有机蒙脱土的层间距由1．55nm增大到4．03nm,有机蒙脱土均匀地分散在苯乙烯-丙烯酸丁酯共聚物中,并且蒙脱土提高了共聚物的热稳定性,随着有机蒙脱土用量的增大．聚合物的转化率先增大,后变小。     

双转子连续混炼机制备插层型聚乙烯/有机蒙脱土纳米复合材料的研究

借助双转子连续混炼机,通过直接熔融插层法制备了聚乙烯/有机蒙脱土纳米复合材料,并用XRD测试了有机蒙脱土的层间距。分析了不同转子转速和喂料速率对聚乙烯有机蒙脱土复合材料层间距及其力学性能的影响。结果表明,选择适当的操作工艺以获得合适的剪切强度对于制备插层型聚乙烯有机蒙脱土纳米复合材料极为重要,当转子转速为400r/min,喂料速率为1.35kg/h时,制得的聚乙烯/有机蒙脱土复合材料层间距最大,插层效果最佳,有机蒙脱土的增强与增韧效果最好。     

可替代丁苯橡胶的丁苯橡胶／蒙脱土纳米复合材料

青岛大学开发了采用乳液共沉法将纳米蒙脱土加到丁苯胶乳乳液中絮凝共沉生产丁苯橡胶／蒙脱土纳米复合材料（SBR／MMT乳液共沉胶）的新技术。纳米蒙脱土可由天然蒙脱土通过有效的有机化插层处理得到。蒙脱土是一种价廉的天然无机材料,其原料来源十分丰富,作为一种新型补强剂,纳米蒙脱土在橡胶中的应用具有极大的优势和广阔的前景。     

Radiation induced modification of NBR and SBR montmorillonite nanocomposites

Nanocomposites of two different kinds of rubber (acrylonitrile-butadiene rubber NBR and styrene butadiene rubber SBR)/organo-montmorillonite nanocomposites modified by hexadecyltrimethyl ammonium bromide were prepared by the reactive mixing intercalation method in the presence of trimethylolpropane trimethylmethacrylate (TMPTMA). The influence of gamma irradiation on the morphology and properties of the rubber nanocomposites was investigated. Intercalated polar or unsaturated matrices (e.g., NBR and SBR)/OMMT nanocomposites can be obtained, which was confirmed by X-ray diffraction (XRD). The clay layers could be uniformly dispersed in the rubber matrix on the nanometer level. Mechanical tests showed that the nanocomposites had good mechanical properties as compared to the neat composites. The results also showed that the irradiated NBR/OMMT nanocomposites had higher thermal stabilities than irradiated SBR/OMMT nanocomposites.     

SBR/有机蒙脱土纳米复合材料的结构与性能研究

通过控制加入芳烃油、相容剂，采用乳液插层法制得了2种不同亚微观结构的SBR／有机蒙脱土（0MMT）纳米复合材料。透射电镜显示制得了插层型和半剥离型纳米复合材料。实验结果表明：炭黑N330的加入，降低了复合材料的延迟硫化现象，改善了复合材料的加工性能；SBR／OMMT／N330纳米复合材料具有优异的力学性能，其耐磨性能下降。     

聚合物/纳米粘土插层复合材料的研究进展

综述了插层法制备聚合物／纳米粘土复合材料的新进展。根据插层机理和方法的差别，插层法主要分为溶液插层和熔融插层两类、总结了使用二次插层和乳液聚合制备聚合物基纳米复合材料的新方法，展望了聚合物／纳米粘土复合材料的开发及应用前景。     

乳液共沉法丁苯橡胶/有机蒙脱土纳米复合材料在轮胎胎面中的应用

用乳液共沉法在中试装置上制备了丁苯橡胶/有机蒙脱土(SBR/OMMT)乳液共沉胶,研究了纳米复合材料的微观结构、力学性能、磨耗性能、加工性能等,讨论了其替代SBR在半钢子午线轮胎胎面中的应用效果.透射电子显微镜观察表明制备的乳液共沉胶是一种插层型纳米复合材料,OMMT与橡胶基质结合得较好;乳液共沉胶的拉伸强度、撕裂强度、硬度、回弹性等与SBR 1502基本相当,扯断伸长率和压缩永久变形有所增大,耐磨耗性能大幅度提高;以乳液共沉胶替代SBR 1502及部分炭黑在半钢子午线轮胎胎面中的应用效果良好,胶料的力学性能、加工性能及成品胎性能均能满足工业生产要求.     

Effect of polymer cement modifiers on mechanical and physical properties of polymer-modified mortar using recycled artificial marble waste fine aggregate

Various polymer-modified mortars using recycled artificial marble waste fine aggregate (AMWFA) were prepared and investigated for the purpose of feasibility of recycling. Styrene–butadiene rubber (SBR) latex and polyacrylic ester (PAE) emulsion were employed as polymer modifier, and compared each other. The replacement ratio of AMWFA was also changed to investigate the effect of it on physical properties. Adding polymer cement modifier into mortar reduced water–cement ratio, and PAE was the more effective polymer cement modifier to reduce water–cement ratio than SBR. PAE emulsion-modified mortar increased the air content entrained as the proportion of PAE was increased. There was little difference in water absorption between SBR latex and PAE emulsion. The compressive strength decreased in the presence of polymer cement modifiers compared to that of no polymer cement modifiers, but the compressive strength of 20% of polymer–cement ratio was higher than that of 10%. After the hot water resistance test, both compressive strength and flexural strength were decreased.     

乳聚丁苯互穿网络型热塑性弹性体的制备

以丁苯胶乳为种子乳液,苯乙烯、甲基丙烯酸甲酯、丙烯腈或它们的混合物的硬单体,用氧化还原引发体系,经种子乳液聚合法同备出复合乳液,絮凝干燥后所得互穿聚合物网络可热塑性反复加工。考察了硬单体的种类和用量、交联剂的种类及用量、反复加工次数对聚合物力学性能的影响。用透射电子显微镜观察了乳胶粒微观形态,结果表明：用混合单体,聚合物力学性能较优,以３５份Ｓｔ＾＋ＭＭＡ为第二单体制备的聚合物的攫断伸长率为４００％,拉伸强度为９．３ＭＰａ,３００％定伸应力为７．６ＭＰ,撕裂强度为７３．９ｋＮ．Ｍ＾－１,邵尔Ａ型硬度为８４。     

Preparation of Porous Polymethyl Methacrylate/Organo-Montmorillonite Composite Membranes for Phenolic Compound Adsorption

The preparation of porous poly(methyl methacrylate)/organo-montmorillonite composite membranes for adsorption application was carried out via entrapment methods. The sponge-like membrane structure was characterized by a scanning electron microscope, whereas the X-ray diffraction, Fourier transform infrared, and thermogravimetric analyses confirmed the incorporation of organo-clays inside the composite membranes. To investigate the applicability of the composite membranes on phenolic compound adsorption, batch-mode adsorption of p-nitrophenol at 0.025 mg/mL was conducted. The optimum feed organo-clay/polymer ratio was 0.3 for the membrane prepared by the emulsion polymerization method, and in this case 75% of p-nitrophenol was adsorbed after 34 h. 80% methanol was selected as the desorbent for its high ability to desorb p-nitrophenol from the composite membrane. The membrane performance in the flow process was similar to the batch result, and the adsorption/desorption cycle was successfully repeated three times.     

SBR/OMMT纳米复合材料的制备及性能研究

以聚苯乙烯(PS)低聚物为相容剂，用熔体插层法制备SBR／有机蒙脱土(OMMT)纳米复合材料，并对其结构及性能进行研究。结果表明，PS大分子能够插入OMMT层间形成复合物；采用熔体插层法使PS／OMMT纳米复合物在SBR基体中实现纳米级分散，可间接实现OMMT在SBR基体中的纳米级分散；当填充5份OMMT时，SBR／OMMT纳米复合材料具有较好的物理性能。