共查询到19条相似文献,搜索用时 171 毫秒
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国产稀土异戊橡胶的性能 总被引:3,自引:0,他引:3
研究了国产稀土异戊橡胶(NdIR)生胶、硫化胶的的应变/应力、混炼、生热以及磨耗性能,并与天然橡胶(NR)和俄罗斯产钛系异戊橡胶(TiIR)进行了对比。结果表明:当顺式-1,4结构含量和门尼粘度超过临界值时,异戊橡胶生胶能产生"应变诱导结晶"现象。NdIR的硫化特性与NR和TiIR相当,且炭黑分散性和物理机械性能也与二者接近。从动态粘弹谱图可以预测,NdIR硫化胶的抗湿滑性优于NR和TiIR,滚动阻力接近NR和TiIR,是一种值得期待的适宜轮胎使用的新型胶种。 相似文献
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研究了硫化温度和硫化时间对天然橡胶(NR)和NR/反式丁戊橡胶(TBIR)并用胶应用性能的影响。结果表明,在相同的硫化温度下,NR与NR/TBIR并用胶的焦烧时间、工艺正硫化时间和交联密度几乎一致。对比140℃、150℃和160℃硫化温度下NR和NR/TBIR硫化胶的性能,NR/TBIR并用胶在160℃下硫化时磨耗性能和滚动阻力优势最大,150℃硫化时疲劳性能优势最大。对比160℃下的硫化时间,发现其变化不会明显影响TBIR在NR体系中的磨耗性能、滚动阻力和疲劳性能优势的发挥。 相似文献
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以天然橡胶(NR)/高反式-1,4-丁二烯-异戊二烯共聚橡胶(TBIR)并用胶为对比,研究白炭黑补强NR/TBIR并用胶的性能。结果表明:NR/TBIR混炼胶和白炭黑补强NR/TBIR混炼胶的强度分别较NR混炼胶和白炭黑补强NR混炼胶提高;随着TBIR用量增大,NR/TBIR硫化胶和白炭黑补强NR/TBIR硫化胶的压缩永久变形和DIN磨耗量分别较NR硫化胶和白炭黑补强NR硫化胶减小,耐屈挠疲劳性能和耐伸张疲劳性能大幅提高,静摩擦因数和动摩擦因数增大;白炭黑补强NR/TBIR硫化胶较白炭黑补强NR硫化胶的白炭黑聚集体平均粒径减小,白炭黑在橡胶基体中的分散性改善。 相似文献
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将普通丁苯橡胶(SBR1,苯乙烯质量分数为0. 235)和高苯乙烯SBR(SBR2,苯乙烯质量分数为0. 68)分别与天然橡胶(NR)并用,研究NR/SBR并用比和SBR苯乙烯含量对并用胶硫化特性、物理性能和阻尼性能的影响。结果表明:随着SBR用量的增大,NR/SBR并用胶的硫化速度、拉伸强度和撕裂强度下降,NR/SBR1并用胶的滞后能量密度(HED)先增大后减小,NR/SBR2并用胶的HED增大;NR/SBR并用比相同时,NR/SBR2并用胶的硫化速度、拉伸强度、拉断伸长率和撕裂强度低于NR/SBR1并用胶;NR/SBR2并用胶的有效阻尼温域拓宽至高温区。 相似文献
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研究炭黑在天然橡胶(NR)/顺丁橡胶(BR)并用胶中分布对并用胶性能的影响。结果表明:BR中炭黑的质量分数增大,NR/BR并用胶硫化胶的定伸应力、拉伸强度和拉断伸长率增大,耐磨性能提高,压缩生热和动态损耗因子减小,抗裂口增长性能变差;NR中炭黑的质量分数增大,NR/BR并用胶硫化胶的耐屈挠性能增强。 相似文献
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研究了两种牌号反式-1,4-丁二烯-异戊二烯共聚橡胶(TBIR)改性天然橡胶(NR),结果表明,10~50份TBIR与NR共混,并用胶焦烧时间(t10)和工艺正硫化时间(t90)略有延长。相比NR硫化胶,NR/TBIR并用硫化胶力学强度保持在较高范围,屈挠疲劳性能大幅度提高,其中NR/TBIR-20=50/50硫化胶一级屈挠疲劳寿命可提高28.6倍,六级屈挠疲劳寿命可提高11.9倍。DMA结果表明,NR与TBIR具有优异的相容性。RPA及DMA 结果均表明NR/TBIR并用硫化胶具有更低的滚动阻力。综合可知,TBIR是一种高性能的合成橡胶新材料,可显著改善NR的综合性能。 相似文献
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研究天然橡胶(NR)/顺丁橡胶(BR)/1,2-聚丁二烯橡胶(1,2-PBR)并用胶的硫化特性、物理性能及动态力学性能,确定适用于轮胎胎面胶的BR/1,2-PBR最佳并用比。结果表明:与NR或BR相比,1,2-PBR加工性能稍差。当BR/1,2-PBR并用比为25/5时,NR/BR/1,2-PBR并用胶的综合物理性能和抗湿滑性能较好;当BR/1,2-PBR并用比为15/15时,并用胶的压缩温升低,压缩永久变形最小,综合力学性能优异,更适合应用于轮胎胎面。 相似文献
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研究天然橡胶(NR)/顺丁橡胶(BR)并用胶的硫化特性、物理性能及动态力学性能,确定适用于中长途载重轮胎胎面胶的NR/BR最佳并用比。结果表明:并用20phrBR为一个临界值,超过20phrBR时,硫化胶的抗裂口增长性能急剧下降;当NR/BR并用比为80/20时,并用胶的综合物理性能较好,损耗因子tanδ低,压缩永久变形小,耐磨性好,更适合应用于载重轮胎胎面。 相似文献
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Development of novel elastomeric blends containing natural rubber and ultra-low-density polyethylene
This study sought to develop novel elastomeric compounds using natural rubber (NR) and ultra-low-density polyethylene (ULDPE). Blends were prepared by means of a two-roll mill for three ratios (70/30, 60/40, and 50/50 NR/ULDPE). Conventional vulcanization was performed in a compression mold. The physical and mechanical properties of the blend were determined according to ASTM standards. The results were compared with those obtained from NR blended with styrene-butadiene rubber (SBR). The morphological examinations with scanning electron microscopy indicated that ULDPE was compatible with NR; thus, the addition of a compatibilizer was not necessary. The cocontinuous phase was dominant in the NR/ULDPE blend containing 50 and 60 wt % NR. The tensile properties, tear resistance, and aging resistance of the NR/ULDPE blends were found to be superior to those of NR/SBR blends. On the other hand, the abrasion and flex cracking resistances of the NR/ULDPE blend were inferior to those exhibited by SBR blends but the Mooney viscosity and resilience of both blends fell in the same range. However, the addition of dicumyl peroxide appeared to have caused crosslinking of the ULDPE phase in the blend, which in turn increased the tensile properties and abrasion and aging resistance. The properties of the tertiary NR/SBR/ULDPE blend were investigated as well. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 650–660, 2001 相似文献
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《塑料、橡胶和复合材料》2013,42(9):365-372
AbstractBis-(triethoxysilylpropyl)-tetrasulfane functionalised carbon nanotubes (t-CNTs) were used as compatibiliser along with liquid isoprene rubber (LIR) in the natural rubber (NR)/polybutadiene rubber (BR) blend. Their reinforcing and compatibilising effects were evaluated by mechanical, fatigue crack growth resistance properties and blend homogeneity. Scanning electron microscope and transmission electron microscope showed enhanced interfacial adhesion between the binary rubber phases and improved dispersion of the minor phase in the rubber blend respectively with the co-existence of LIR and carbon nanotubes. The tensile strength of the carbon black (CB) filled NR/BR blend reached its optimum when 3 phr CB was replaced with an equal amount of t-CNTs in the presence of 7 phr LIR, while the fatigue crack growth resistance property achieved its maximum in the presence of 3 phr LIR. This interesting co-compatibilisation behaviour of t-CNTs and LIR suggests that t-CNTs have a better effect than CB with the assistance of LIR, which is an effective plasticiser in the NR/BR blend. 相似文献