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通过钛酸四丁酯与热塑性酚醛树脂(Novolac树脂)的酯交换反应合成了一类快速固化型杂化酚醛树脂,可加入六亚甲基四胺进行固化。通过红外、核磁、凝胶时间和粘度等测试研究了树脂的分子结构和理化性能。结果表明:随着钛酸四丁酯用量增大,杂化酚醛树脂的分子质量明显增大,凝胶时间缩短,杂化酚醛树脂溶液的粘度增大,并基本呈线性关系。钛酸酯键有效改进了酚醛树脂的粘接性。固化速率的加快来源于改性树脂分子质量的增大和钛酸酯结构对于固化反应的催化作用;而杂化酚醛树脂粘接性的提高是由于酚醛树脂中的钛酸酯结构起到了偶联剂作用。 相似文献
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在紫外光固化体系中加入各种不同的无机纳米材料,考察了纳米材料本身的性质、体系黏度、纳米材料含量和分散方式对无机纳米粒子分散稳定性的影响。结果表明,纳米材料表面经过硅烷偶联剂或硬脂酸的处理,体系黏度的增大、合适的纳米材料含量(质量分数3%)、超声-高速剪切等有助于提高纳米材料在紫外光固化体系中的稳定性。以纳米二氧化钛为例:紫外光固化体系黏度由25 s提高到267 s,其分散稳定性由1 d提高到5个月以上;质量分数由1%提高到3%,其分散稳定性在12 d左右,继续提高其质量分数至5%,分散稳定性下降至7 d。 相似文献
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采用不同种类的硅烷偶联剂和钛酸酯偶联剂处理氧化铝粉体,研究了偶联剂种类和用量对导热硅橡胶热导率、硬度和粉体最大体积填充率的影响。结果表明:在降低固化前浆料黏度和提高粉体体积填充率方面,硅烷偶联剂优于钛酸酯偶联剂,但钛酸酯偶联剂可以显著降低复合材料的硬度。 相似文献
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Mg(OH)2表面处理对LDPE力学性能及加工性的影响 总被引:1,自引:0,他引:1
选择了多种偶联剂对氢氧化镁(MH)进行表面处理;研究了表面处理对LDPE/MH体系的力学、加工和分散性能的影响。结果表明,偶联剂能显著提高材料的断裂伸长率,但会略微降低其拉伸强度。硅烷、钛酸酯偶联剂的最佳使用量在1%~2%;而脂肪酸处理剂的最佳使用量在4%~6%。偶联剂的选择影响到材料的力学性能,脂肪酸ste—zn,硅烷偶联剂中Al51,钛酸酯偶联剂JN201有较好的处理效果。表面处理体系有较好的流动性和加工性能。SEM观察表明,未经表面处理体系的粒子分散性比经表面处理体系的粒子分散性要差。 相似文献
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报道了螯合-配位型硼酸酯偶联剂(OL- BAP)的性能、偶联作用机理及结构特点,研究OL-BAP用量对PVC/CaCO3体系力学性能的影响以及OL-BAP改性CaCO3对PVC/CaCO3复合体系力学性能的影响,并与铝酸酯偶联剂、钛酸酯偶联剂进行比较,得出OL-BAP的最佳用量为CaCO3的1%。OL-BAP是继铝酸酯偶联剂、钛酸酯偶联剂之后的又一类性能优异的水解稳定性良好的新型偶联剂。 相似文献
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铝钛复合偶联剂及其在聚合物填充体系中的应用 总被引:6,自引:0,他引:6
以OL-1618为例,概述了铝钛复合偶联剂的结构与性能;分析并比较了铝钛复合偶联剂、钛酸酯偶联剂、铝酸酯偶联剂在各种聚合物填充体系中应用效果. 相似文献
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采用3种钛酸酯偶联剂改性超细磷石膏(UPG),将改性后的UPG添加到高密度聚乙烯(HDPE)中,研究了钛酸酯偶联剂结构对UPG/HDPE复合材料力学性能的影响。结果表明,钛酸酯偶联剂改性的UPG接触角增大,吸油值降低,201-UPG改性效果最佳,接触角和吸油值分别为106.25°和0.23。与UPG/HDPE复合材料相比,101-UPG/HDPE、201-PG/HDPE、311-UPG/HDPE复合材料的拉伸性能、弯曲性能和冲击性能得到了一定的提高,在101-UPG/HDPE复合材料中的效果最佳,分别提高了42.41%、64.04%、174.65%。SEM测试表明,加入了钛酸酯改性剂的UPG在HDPE中的分散效果较佳;流变测试显示,101-UPG/HDPE复合材料的黏度比HDPE明显提高。 相似文献
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采用不同偶联剂对纳米碳化硅进行表面处理后,制备了聚四氟乙烯/纳米碳化硅复合材料,考察了偶联剂种类和含量随载荷变化对复合材料摩擦磨损性能的影响,并利用扫描电子显微镜观察和分析了复合材料磨损表面形貌及其磨损机理。结果表明,经表面处理的纳米碳化硅填充后的复合材料硬度和摩擦磨损性能均有提高,以钛酸酯偶联剂(NDZ101)处理效果最好;随着偶联剂含量的增大,钛酸酯偶联剂(NDZ101)处理的复合材料的磨损量和摩擦因数均增大,偶联剂最佳含量为填料质量的1 %;偶联剂处理后的纳米碳化硅与基体之间形成了良好的界面,复合材料的磨损以黏着磨损和磨粒磨损为主。 相似文献
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Three commercially available silane, titanate and aluminate based coupling agents were used to pretreat nano‐SiO2 for the preparation of nylon‐6/nano–SiO2 composites via in situ polymerization. The interphases formed in different composite systems and their influence on material properties were investigated. Results indicated that the interfacial interactions differed between composite systems, whereas rigidity and toughness of composites were all improved by addition of pretreated silicas at an optimal content of 4.3 wt%. The presence of pretreated silicas did not have a distinct influence in the non‐isothermal crystallization behaviour of the nylon matrix. The composites containing pretreated silicas had slightly higher dynamic viscosities and superior storage moduli at high frequency, compared with neat nylon‐6. Copyright © 2003 Society of Chemical Industry 相似文献
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耐磨紫外光固化水性木器涂料的研究 总被引:1,自引:0,他引:1
以水溶性聚氨酯丙烯酸酯为基础配制紫外光固化水性木器涂料,加入纳米氧化铝,考察了体系黏度、二氧化硅、偶联剂对纳米氧化铝分散稳定性的影响,测试了其附着力、硬度、光泽度、耐水性、耐醇性和耐磨性等性能。结果显示,该涂料具有良好的耐水性、耐醇性和耐磨性。 相似文献
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采用偶联剂对钛酸钾晶须进行表面改性,再与甲苯二异氰酸酯、聚醚多元醇等原料制备了改性钛酸钾晶须增强聚氨酯跑道面层复合材料。考察了偶联剂种类、改性钛酸钾晶须含量对改性钛酸钾晶须增强聚氨酯复合材料力学性能和耐久性能的影响。结果表明,该材料拉伸强度达到2.9 MPa、扯断伸长率达到340%,经加速老化试验后满足田径场地规定的技术要求。 相似文献
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Wei-Sheng Chen Yu-Lun Chang Hsing-I Hsiang Fu-Chi Hsu Fu-Su Yen 《Ceramics International》2011,37(7):2347-2352
During ferrite powder–polymer resin slurry preparation, the ferrite particles tend to hold together, forming agglomerates, which lead to the formation of micro-structural defects in the ferrite powder–polymer coatings. These defects affect the quality of magnetic devices. In this study, the titanate coupling agent effects on the NiZn ferrites powder dispersion in an epoxy resin and solvent system and the electromagnetic properties of NiZn ferrite powders–epoxy resin composite coatings are investigated. It was observed that the dispersion of NiZn ferrite powders and the affinity of NiZn ferrites and epoxy resin can be substantially enhanced by coating a titanate coupling agent onto the ferrite powder surfaces. This coating promotes mixing homogeneity and increases the dielectric constants at low frequencies (below 100 Hz) due to the increase in phase boundary between the NiZn ferrite powders and epoxy resin. 相似文献
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An investigation was made on the rheological behavior and physical/mechanical properties of highly filled nylon 6 composites with and without a coupling agent. As fillers, calcium carbonate and calcium silicate were used, and, as coupling agent, two silanes (Union Carbide, A1100 and Y9187) and two titanates (Kenrich Petrochemicals, KR-44 and KR-138) were used. It was found that all the coupling agents used increased the viscosities of the nylon/CaCO3 system. However, the effect of the coupling agents on the viscosity of the nylon/CaSiO3 system seems quite complex; namely, the titanate KR-44 decreased the melt viscosity of the nylon/CaSiO3 composite, whereas the titanate KR-138S and the silane Y9187 increased it. In general, the effectiveness of the coupling agents in improving the physical/mechanical properties of the nylon/CaCO3 and nylon/CaSiO3 composites was marginal. A considerable decrease in glass transition was observed upon exposure of all samples to water, regardless of the type of filler and coupling agent. 相似文献