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采用原位改性纳米氧化铝制备纳米氧化铝/天然橡胶(NR)复合材料,研究纳米氧化铝用量及原位改性时间、偶联剂Si69用量对纳米氧化铝/NR复合材料的物理性能、动态力学性能和导热性能的影响。结果表明:随着纳米氧化铝用量的增大,复合材料的拉伸强度减小,热导率和压缩疲劳温升增大。原位改性可以提高纳米氧化铝与NR之间的界面结合作用。随着原位改性时间的延长或随着偶联剂Si69用量的增大,复合材料的拉伸强度和热导率均先增大后减小,压缩疲劳温升逐渐减小。 相似文献
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以天然胶乳浸润槟榔纤维,制备天然橡胶(NR)复合材料,研究偶联剂Si69-纳米氧化锌改性槟榔纤维对NR复合材料性能的影响。结果表明:与未改性槟榔纤维的NR复合材料相比,偶联剂Si69-纳米氧化锌改性槟榔纤维的NR复合材料的物理性能、耐溶剂性能和抗湿滑性能改善,剪切模量减小,滚动阻力提高;偶联剂Si69-纳米氧化锌改性槟榔纤维的NR复合材料的综合性能优于偶联剂Si69和纳米氧化锌单独改性槟榔纤维的NR复合材料。 相似文献
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采用间苯二酚-甲醛(RF)树脂改性淀粉,通过乳液共沉法制备淀粉/NR复合材料,研究改性淀粉用量对复合材料性能的影响,并与相同体积分数的炭黑和偶联剂Si69改性的白炭黑填充的NR复合材料进行对比。试验结果表明,RF树脂的加入增强了淀粉与NR之间的交联作用,提高了淀粉/NR复合材料的物理性能;当淀粉用量为20份、经3.6份RF树脂改性后,复合材料的综合性能最佳;随着改性淀粉用量的增大,复合材料的硬度和300%定伸应力增大。当填料体积分数相同时,改性淀粉对NR的补强效果与炭黑接近,且优于白炭黑。 相似文献
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研究表面活性剂或不同偶联剂对石墨改性效果以及石墨用量对天然橡胶(NR)复合材料物理性能、导热性能及微观结构的影响。结果表明:偶联剂Si69对石墨的改性效果最好,石墨呈现亲油性;与未改性石墨填充NR复合材料相比,偶联剂Si69改性石墨填充NR复合材料中石墨与NR间的界面相容性得到改善,物理性能和导热性能提高;随着偶联剂Si69改性石墨用量的增大,复合材料导热性能提高,物理性能先提高后下降。当改性石墨用量为30份时,复合材料的综合性能较好。 相似文献
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采用偶联剂Si69对三氧化二钇进行表面改性,研究改性三氧化二钇对NR/BR并用胶的补强效果.红外光谱和热重分析表明,在改性三氧化二钇的表面键合了偶联剂Si69;改性三氧化二钇/NR/BR复合材料的拉伸强度和拉断伸长率比未改性三氧化二钇/NR/BR复合材料明显提高;扫描电子显微镜观察发现,改性三氧化二钇在橡胶基体中分布均匀,与橡胶的相容性很好。 相似文献
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Natural silica in fly ash (FA) particles of 30 and 60 phr were incorporated as reinforcing filler in natural rubber (NR) compounds. Improvements of cure characteristics and mechanical properties of the FA/NR composites were expected by surface treatment of the FA particles, this being carried out using various contents of bis‐(3‐triethoxysilylpropyl) tetrasulfane (Si69), as a chemical silane coupling agent, and sodium hydroxide (NaOH) solution. The results suggested that the Si69 coupling agent was a satisfactory property promoter in the FA/NR composites through C S bonding with rubber molecules and siloxane linkages with FA particles. Using NaOH solution did not improve the mechanical properties of the composites. The mechanical properties of the FA/NR composites appeared to increase at low Si69 concentrations of 2.0–4.0 wt%, but decreased at high Si69 loadings of 6.0–8.0 wt%. The decrease in mechanical properties resulted from a reduction of crosslink density and a formation of flexible polysiloxane from the self‐condensation reaction of the Si69. The presence of Si69 was observed to interfere with the sulphur crosslink formation. No synergetic effect on the properties of the rubber composites was observed when using a mixture of NaOH and Si69. This article recommends concentrations of 2.0–4.0 wt% Si69 to be introduced into the FA/NR composites to achieve the optimum properties. POLYM. COMPOS., 27:30–40, 2006. © 2005 Society of Plastics Engineers 相似文献
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The fatigue resistance of silica‐filled natural rubber (NR) mixes modified with phosphorylated cardanol prepolymer (PCP) was studied in comparison with similar compositions without PCP and with those containing the same dosage of a silane coupling agent (Si‐69). Considerable improvement in the fatigue resistance was observed for the PCP‐modified NR vulcanizate containing 20 phr of silica compared with the unmodified and Si‐69 modified vulcanizates. In addition, the tear strength of the PCP‐modified NR vulcanizate was higher than that of the others. Atomic force microscopy and the scanning electron microscopy of the vulcanizates showed better dispersion of silica particles in the NR matrix in the presence of PCP than in the unmodified and Si‐69‐modified NR vulcanizates. It is assumed that, at a dosage of 5 phr, PCP functions as a coupling agent between NR and the silica particles thereby improving the filler dispersion and consequently the mechanical properties of the vulcanizate. Copyright © 2005 Society of Chemical Industry 相似文献