共查询到18条相似文献,搜索用时 156 毫秒
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采用机械共混法制备凹凸棒土(AT)/丁腈橡胶(NBR)纳米复合材料,研究了AT用量、偶联剂种类对复合材料硫化特性和力学性能的影响,并用透射电镜(TEM)和扫描电镜(SEM)观察了AT及其纳米复合材料的微观结构。结果表明,在机械剪切力的作用下,AT分离并分散在NBR中,形成纳米复合材料。随着AT用量的增加,AT/NBR的t10和t90缩短,硫化速度提高,硬度、拉伸强度、定伸应力和撕裂强度先增大后逐渐减小或不变;当AT用量为40份时,综合性能最好。偶联剂用量相同时,Si69改性效果最好,制得的AT/NBR综合力学性能与白炭黑、炭黑填充NBR性能相近。 相似文献
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以硅烷偶联剂KH 570改性凹凸棒土(AT),制备了甲基乙烯基硅橡胶(MVQ)/AT复合材料,考察了紫外辐射对MVQ/AT复合材料物理机械性能及热性能的影响,并通过扫描电子显微镜表征了复合材料的微观形貌。结果表明,随着辐照时间的延长,MVQ/AT复合材料的邵尔A硬度和拉伸强度先增大后减小,扯断伸长率先减小后增加,热稳定性先提高后下降;MVQ/AT复合材料经紫外辐照后,表面颜色加深并出现裂纹,随着辐照时间的延长,裂纹数量逐渐增加,表面变得粗糙,并且有部分填料暴露在材料表面。 相似文献
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研究了天然橡胶(NR)与反式聚异戊二烯(TPI)的配比对NR/TPI形状记忆复合材料力学性能、热性能、形状记忆性能等的影响。结果表明,随着NR用量的增加,NR/TPI形状记忆复合材料的交联密度略有降低,拉伸强度、100%和300%定伸应力及硬度均逐渐减小,而扯断伸长率逐渐增大,呈现出塑性形变增大的趋势;储能模量逐渐减小而损耗因子呈现升高趋势;结晶部分含量的减少导致复合材料的形状记忆性能逐渐下降。当NR与TPI的质量比为40/60时复合材料的综合性能较好。 相似文献
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采用双螺杆挤出机制备了一系列不同配方的聚丙烯/马来酸酐接枝聚乙烯/蛋壳粉复合材料,研究了蛋壳粉用量对复合材料拉伸强度、冲击强度、断裂伸长率、硬度、维卡软化温度、熔体流动速率(MFR)的影响.结果表明,随着蛋壳粉用量的增加,复合材料的拉伸强度先增加后降低,冲击强度、断裂伸长率逐渐减小,硬度逐渐增加;随着蛋壳粉用量的增加,... 相似文献
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研究了聚甲基倍半硅氧烷(PMSQ)对高抗冲聚苯乙烯(HIPS)阻燃性能、流动性能以及力学性能的影响。结果表明:随着PMSQ用量的增加,PMSQ/HIPS复合材料极限氧指数逐渐增加;拉伸强度和冲击强度逐渐减小;弯曲强度和断裂伸长率呈现先增后减的趋势;PMSQ用量为25质量份时,复合材料的流动性能最好。 相似文献
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以聚丙烯为基体,木粉为填料,采用机械共混、二次挤出共混和注塑成型方法制备不同木粉含量的PP/木粉复合材料,并且测定了PP/木粉复合材料的力学性能。实验结果表明:随着木粉用量的增加,复合材料拉伸强度逐渐增大;木粉用量为60%时,复合材料拉伸强度达到最大值36.04 MPa;木粉用量为80%时,复合材料拉伸强度降低到34.60 MPa。木粉的含量由20%增加到80%,复合材料弹性模量由579.12 MPa增加到869.80MPa,断裂伸长率从18.92%降低到7.39%,冲击强度由9.33 kJ/m2降低到7.76 kJ/m2。这是因为PP/木粉复合材料体系中随着木粉含量的增加,木粉起到了应力集中的作用,使材料变脆,冲击强度降低。 相似文献
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木粉/聚丙烯复合材料力学性能及结晶行为研究 总被引:10,自引:0,他引:10
研究了木粉/聚丙烯复合材料的力学性能,结晶行为和微观结构.在木粉含量很高的情况下材料保持很好的拉伸强度,而材料的韧性随着木粉含量的增加下降很大.增容剂MA-PP的加入对材料的拉伸强度很很大的提高,而对冲击强度的影响不大.木粉/PP复合材料的结晶温度随着木粉含量的增加而增大,表明木粉对PP有异相成核的作用.复合材料电镜照片显示木粉在树脂中即使在较高含量下也分散均匀,马来酸改性聚丙烯(MA-PP)的加入提高木粉与树脂基体的界面结合. 相似文献
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将纳米TiO_2、稻壳粉、聚氯乙烯(PVC)和稳定剂等按一定比例混合,用挤出成型法制备PVC/稻壳粉木塑复合材料。考察纳米TiO_2添加量对PVC/稻壳粉木塑复合材料性能的影响。实验结果表明,随着纳米TiO_2含量的增加,木塑复合材料的力学性能、防水性能和热稳定性呈现先增加后降低的趋势,但木塑复合材料的表面颜色却随着纳米TiO_2含量的增加而逐渐变浅。当纳米TiO_2含量为1.00份时,木塑复合材料的综合性能最好,与未添加纳米TiO_2的木塑复合材料相比,其拉伸强度、冲击强度和弯曲强度分别提高了40.6%,62.2%和19.7%,8 d的吸水率从2.5%降低为1.6%,表面接触角从78.5°增加到82.1°,800℃时的残炭率从21.1%提高到29.5%。 相似文献
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Short glass fibers were added to poly(vinyl chloride) (PVC)/wood flour composites as reinforcement agents. Unnotched and notched impact strength of PVC/wood flour/glass fiber hybrid composites could be increased significantly without losing flexural properties by adding type L glass fibers and over 40% of PVC. There was no such improvement when using type S glass fiber. The impact strength of hybrid composites increased along with the increment of the type L glass fiber content at a 50% PVC content. At high PVC contents, impact fracture surfaces were characterized by wood particle, glass fiber breakage and pullout, whereas interfacial debonding was the dominant fracture mode at higher filler concentrations. The significant improvement in impact strength of hybrid composites was attributed to the formation of the three‐dimensional network glass fiber architecture between type L glass fibers and wood flour. 相似文献
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Wood/plastic composites (WPCs) can absorb moisture in a humid environment due to the hydrophilic nature of the wood in the composites, making products susceptible to microbial growth and loss of mechanical properties. Co‐extruding a poly(vinyl chloride) (PVC)‐rich cap layer on a WPC significantly reduces the moisture uptake rate, increases the flexural strength but, most importantly, decreases the flexural modulus compared to uncapped WPCs. A two‐level factorial design was used to develop regression models evaluating the statistical effects of material compositions and a processing condition on the flexural properties of co‐extruded rigid PVC/wood flour composites with the ultimate goal of producing co‐extruded composites with better flexural properties than uncapped WPCs. Material composition variables included wood flour content in the core layer and carbon nanotube (CNT) content in the cap layer of the co‐extruded composites, with the processing temperature profile for the core layer as the only processing condition variable. Fusion tests were carried out to understand the effects of the material compositions and processing condition on the flexural properties. Regression models indicated all main effects and two powerful interaction effects (processing temperature/wood flour content and wood flour content/CNT content interactions) as statistically significant. Factors leading to a fast fusion of the PVC/wood flour composites in the core layer, i.e. low wood flour content and high processing temperature, were effective material composition and processing condition parameters for improving the flexural properties of co‐extruded composites. Reinforcing the cap layer with CNTs also produced a significant improvement in the flexural properties of the co‐extruded composites, insensitive to the core layer composition and the processing temperature condition. Copyright © 2009 Society of Chemical Industry 相似文献