共查询到19条相似文献,搜索用时 62 毫秒
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ALSR/OMMT纳米复合材料的制备与性能研究 总被引:1,自引:1,他引:1
采用原位聚合法制备加成型液体硅橡胶(ALSR)/有机蒙脱士(OMMT)纳米复合材料,并对其结构和性能进行研究。结果表明,经改性的OMMT的层间距是钠基蒙脱士(Na-MMT)的1.4~3.6倍;OMMT质量分数为0.01时,ALSR/OMMT纳米复合材料的物理性能和热稳定性较好,OMMT的剥离程度较大,基本以纳米尺度的剥离片层分散在ALSR基体中。 相似文献
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采用凝聚共沉法制备碱活化改性高岭土/NR复合材料,并对其物理性能和微观结构进行研究。结果表明,高岭土改性时间为3d、改性高岭土与天然胶乳混合温度为45℃、改性高岭土用量为40份时,碱活化改性高岭土/NR复合材料的综合物理性能较好;改性高岭土在NR基体中发生了定向排列,基本上以面-面平行状态均匀分散,大部分高岭土以厚度为25-75nm的层叠形式平行分布在NR基体中;改性高岭土与NR基体间形成过渡层。 相似文献
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ABS/蒙脱土纳米复合材料的制备、结构及性能 总被引:1,自引:1,他引:1
将SAN/蒙脱土纳米复合材料与ABS高胶粉熔融共混得到ABS/蒙脱土纳米复合材料。对纳米复合材料的机械性能进行了表征.结果发现蒙脱土的加入一定程度上提高了ABS的杨氏模量和弯曲模量,但冲击强度有明显的降低。采用XRD、TEM和SEM对纳米复合材料的结构进行表征,结果表明在共混过程中,蒙脱土片层的物理特性导致其基本分布在橡胶粒子的表面.甚至造成粒子的变形和破裂;ABS/蒙脱土纳米复合材料在冲击过程中,蒙脱土片层的分散状态导致橡胶粒子不能发生塑性变形,冲击断面呈多孔形态。 相似文献
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NR/有机蒙脱土/GMA纳米复合材料的制备与性能研究 总被引:5,自引:0,他引:5
采用胶乳接枝插层法制备NR/有机蒙脱土/甲基丙烯酸缩水甘油酯(GMA)纳米复合材料,并对其性能进行研究。结果表明,在NR胶乳与有机蒙脱土体系中加入GMA,并使之原位聚合,同时实现对NR的接枝和对有机蒙脱土的插层并与有机蒙脱土层间的基团产生化学结合,可以制备NR/有机蒙脱土/GMA纳米复合材料;采用胶乳接枝插层法制备的NR/有机蒙脱土/GMA纳米复合材料的物理性能和耐热氧老化性能优异,动态力学性能良好,热稳定性与NR胶料相差不大。 相似文献
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制备一维多壁碳纳米管(MWCNTs)增强丁基橡胶(IIR)/聚丙烯(PP)动态硫化热塑性弹性体(TPV)复合材料,研究IIR/PP用量比(简称橡塑比)对复合材料相态结构、介电性能、导热性能和物理性能的影响。结果表明:复合材料呈现“海-岛”相结构,IIR相以微米级交联颗粒分散在PP相中;MWCNTs主要分散在PP中,随着橡塑比的增大,MWCNTs有少量团聚现象;随着橡塑比的增大,复合材料的交流电导率、介电常数和热导率增大,且橡塑比大于6/4时增速减小;随着橡塑比的减小,复合材料的拉伸强度先增大后减小;当橡塑比为5.5/4.5时,复合材料的物理性能较好。 相似文献
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The addition-type liquid silicone rubber (ALSR) co-filled with spheroidal Al2O3 and flaky BN was prepared by the mechanical blending and hot press methods to enhance the thermal, electrical, and mechanical properties for industrial applications. Morphologies of ALSR composites were observed by scanning electron microscopy (SEM). It was found that the interaction and dispersion state of fillers in the ALSR matrix were improved by the introduction of BN sheets. Thermal, electrical, and mechanical performances of the ALSR composites were also investigated in this work. The result indicated that the thermal conductivity of ALSR can reach 0.64 W m−1 K−1 at the loading of 20 wt% Al2O3/20 wt% BN, which is 3.76 times higher than that of pure ALSR. The addition of Al2O3 particles and BN sheets also improve the thermal stability of ALSR composites. Moreover, pure ALSR and ALSR composites showed relatively lower dielectric permittivity (1.9–3.1) and dielectric loss factor (<0.001) at the frequency of 103 Hz. The insulation properties including volume resistivity and breakdown strength were improved by the introduction of flaky BN in the ALSR matrix. The volume resistivity and characteristic breakdown strength E0 are 6.68 × 1015 Ω m and 93 kV/mm, respectively, at the loading of 20 wt% Al2O3/20 wt% BN. In addition, the mechanical characteristics including elongation at break and tensile strength of ALSR composites were also enhanced by co-filled fillers. The combination of these improved performances makes the co-filled ALSR composites attractive in the field of electrical and electronic applications. 相似文献
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Tire rubber particles were mixed randomly with short sisal fibers and hot pressed. Sisal fibers were used as received, mercerized, and mercerized/acetylated. The fibers were characterized by scanning electron microscopy (SEM), thermal gravimetry analysis (TGA), infrared spectroscopy (FTIR), water sorption, and mechanical properties. Thermal stability of the mercerized/acetylated fibers improves (from 200 to 300°C) with respect to the raw fibers, and water sorption is ~ 20% smaller than for the raw and the mercerized fibers. Tensile strength is unchanged after the chemical treatments. Water sorption, mechanical properties, and SEM evaluated the performance of the tire rubber composites. All composites showed enhanced elastic modulus; increase is dependent on fiber load. Smallest water sorption was obtained in composites with the mercerized/acetylated fibers. With these fibers at 10% load, the best results were obtained with the smaller tire rubber particles (320 μm) and at 5% load with the bigger (740 μm) tire rubber particles. Both composites showed ~ 50% increase in tensile strength when compared to similar composites with raw fibers. SEM of the surface of fracture showed that the adhesion between fiber and rubber was enhanced after both chemical treatments. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2507–2515, 2003 相似文献
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用熔体插层法制备甲基乙烯基硅橡胶(MVQ)/有机改性蒙脱土(OMMT)纳米复合材料并研究其微观结构和性能。结果表明:OMMT改性剂疏水性从优到劣的顺序为I.44P,I.30P,Bengel434,I.44P和I.30P在MVQ中的分散性优于Bengel434;MVQ/OMMT纳米复合材料的物理性能和热稳定性从优到劣的顺序为MVQ/I.44P,MVQ/I.30P,MVQ/Bengel434纳米复合材料;添加40份I.44P的MVQ/I.44P纳米复合材料的100%定伸应力、拉伸强度和撕裂强度比纯胶有较大提高。 相似文献
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High-temperature vulcanized silicone rubber composites are highly desirable as outdoor insulating materials due to their immense thermal and electrical performance. The aim of this work is to study the role of co-combined fillers (modified fumed silica [MFS], titanium dioxide [TiO2], with graphene [G]) on electrical and thermal properties of silicone rubber (S) composites. The dielectric response of S/MFS_10 phr and S/TiO2_20 composites tailored with 2 phr G was characterized by broadband dielectric spectroscopy. The hybrid filler/composites were found to show higher thermal stability when 2 phr G was added. In addition, a low quantity of G filler was found to slightly increase the AC dielectric breakdown strength of the S/MFS_10 and S/TiO2_20, where an improvement of 3 and 5% was found, respectively. Several steps were observed in the thermal decomposition of the S rubber composites by thermogravimetric analysis-Fourier-transform infrared spectroscopy. Our findings revealed great potentials for fabricating hybrid-filler/silicone rubber composites with enhanced electrical and thermal properties for outdoor insulating applications. 相似文献
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Cassava starch-filled natural rubber (NR) composites were prepared by using direct blending and co-coagulation method. The effects of two different method and cassava starch loading on morphology, mechanical properties and thermal properties of cassava starch/NR composites were studied. X-ray diffraction results and scanning electron microscopy images proved that co-coagulation method promotes better dispersion of cassava starch than direct blending method. The composites prepared by co-coagulation method exhibited higher values of tensile strength, tear strength, hardness, and thermal stability. The optimum value of tensile strength and tear strength of cassava starch/NR composites were achieved at a 10 phr cassava starch loading. 相似文献
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PP/蒙脱土纳米复合材料的制备、结构与性能 总被引:8,自引:0,他引:8
采用聚丙烯(PP)与甲基丙烯酸甲酯(MMA)、马来酸酐(MAH)、丙烯酸丁酯(BA)三单体的固相接枝共聚物(TMPP)作为相容剂,通过熔融共混法制备了PP/蒙脱土纳米复合材料,对纳米复合材料的热稳定性能和阻燃性能进行了研究,用X射线衍射分析和透射电镜表征了该纳米材料的结构。结果表明,少量TMPt,的加入,可明显提高复合材料的力学性能,其拉伸强度提高10%,冲击强度提高88%,弯曲模量提高90%;蒙脱土在PP基体中主要以插层形式存在,同时存在少量的剥离结构。 相似文献