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考察了原位接枝改性白炭黑(SiO_2)与炭黑(CB)并用对天然橡胶(NR)/反式聚异戊二烯(TPI)并用胶硫化特性、力学性能及动态力学性能的影响。结果表明,随着SiO_2并用比的增加,NR/TPI混炼胶的焦烧时间和正硫化时间逐渐延长,门尼黏度逐渐增大,加工流动性降低,硫化胶的拉伸强度、300%定伸应力和回弹性逐渐下降,邵尔A硬度逐渐上升;当CB/SiO_2(质量比)为40/10时,硫化胶的撕裂强度达到最大值(67.8 k N/m);当CB/SiO_2为30/20时,耐磨性能达到最佳;当CB/SiO_2为10/40时,硫化胶的2级和6级耐屈挠性能最好,分别达到5.4×10~5次与8.0×10~5次;SiO_2的加入可同时改善NR/TPI硫化胶的抗湿滑性能、滚动阻力和动态生热,当SiO_2用量为50份时,相比于CB用量为50份时,NR/TPI硫化胶的滚动阻力和动态生热分别降低23.8%和29.8%,抗湿滑性能提升8.86%。 相似文献
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研究不同炭黑对溶聚丁苯橡胶(SSBR)性能的影响。结果表明:在密炼(一段混炼)过程中炭黑N330填充SSBR胶料的温度和功率均较高,不同炭黑填充SSBR胶料的粘-切依赖性大致相同;炭黑粒径越小、结构度越高,其填充SSBR胶料的Payne效应越显著;炭黑SP5000填充SSBR胶料的焦烧时间最长,炭黑N115,N234,N330和N550填充SSBR胶料的硫化速率稍快;粒径较小的炭黑填充SSBR硫化胶的物理性能和耐磨性能较优,但压缩温升较高;粒径相近而结构度较高的炭黑填充SSBR硫化胶的物理性能优于结构度较低的炭黑填充硫化胶;粒径较大的炭黑填充SSBR硫化胶的抗湿滑性能较好和滚动阻力较低,炭黑N774填充SSBR硫化胶的抗湿滑性能最好,且滚动阻力最低。 相似文献
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CARIFLEX S-1210和 S-1215是应用在轮胎胎面胶中的两种溶聚丁苯橡胶(S-SBRS)。其中,S-1215胶赋于胎面硫化胶较大的湿路面抓着力和较小的滚动阻力。然而,与类似配方的 S-1210硫化胶相比,由于 S-1215胶的玻璃化转变温度(Tg)较高,因此其耐磨性较差。当然,S-1210胶也能够使胎面胶具有低滚动阻力特性,但因其 Tg较低,故湿路面抓着力较 S-1215类硫化胶的差。通过并用其它橡胶,例如:天然橡胶、聚丁二烯橡胶或高苯乙烯乳聚丁苯橡胶可使上述两种溶聚丁苯橡胶的硫化胶性能得到改善。另外一种方法是将这两种溶聚丁苯橡胶进行并用。这两种橡胶是一对易混合的橡胶。通过选择此两种橡胶的合适并用比,可使其混炼胶性能和硫化胶性能都得到合意的调整,就好象是采用了一种介于 S-1215与 S-1210二者中间的橡胶。 相似文献
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以BR9000为对比样,探讨BR9002的基本性能及其在擦布胶中的应用。结果表明,与BR9000相比,BR9002的相对分子质量分布宽,门尼粘度小;在相同炭黑N330用量下,BR9002硫化胶的拉伸强度和撕裂强度小,压缩温升略低;炭黑N330用量小于65份时,BR9002硫化胶的拉断伸长率大,定伸应力小,耐磨性较差,炭黑N330用量大于65份时则均相反;BR9002硫化胶(炭黑N330用量为60份)的抗湿滑性能差,滚动阻力大。采用BR9002的擦布胶拉伸性能与采用BR9000的擦布胶相当,粘合性能较好。 相似文献
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传统的镍系顺丁橡胶BR9000和四种稀土顺丁橡胶以低并用比(25phr)与SSBR并用时,BR9000与SSBR并用的硫化胶性能与稀土顺丁橡胶并无明显差距,有些性能还要比一些稀土顺丁橡胶更加优良。稀土顺丁橡胶CB24在物理机械性能方面表现出较好的综合性能。具有长链支化结构的稀土顺丁橡胶Nd24EZ具有最高的直角撕裂强度和最低的裂纹扩展速率。具有长链支化结构和高门尼粘度的稀土顺丁橡胶Nd22EZ则具有最佳的滚动阻力和抗湿滑性能。CB24虽然在抗湿滑性能方面表现优良,但其滚动阻力性能在五种顺丁橡胶中是最差的。Nd22EZ与Nd24EZ与白炭黑的相互作用力最强,白炭黑分散最好,表现出最低的佩恩效应。CB24和SKD-NDII则与白炭黑相互作用力较弱,白炭黑分散较差,佩恩效应最强。 相似文献
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稀土顺丁橡胶与丁苯橡胶(SBR)共混,可以改善SBR的耐低温性能。当稀土顺丁橡胶/SBR(质量比)这20/80时,-30℃的tanδ仅小于SBR,60℃的tanδ最小。其共混胶的应力-应变性能、湿滑指数、磨耗及生热性能均优于镍系顺丁橡胶/SBR共混体系。 相似文献
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研究超细全硫化粉末丁苯橡胶(UFPSBR)对天然橡胶(NR)/丁苯橡胶/顺丁橡胶(BR)胎面胶性能的影响。结果表明:与未加UFPSBR的胎面胶相比,加入2~3份UFPSBR的NR/溶聚丁苯橡胶/BR胎面胶拉伸强度略有减小,耐磨性能和抗湿滑性能提高,生热降低;加入1~2份UFPSBR的NR/乳聚丁苯橡胶/BR胎面胶拉伸强度增大,抗湿滑性能略有提高,滚动阻力变化不大,耐磨性能下降。 相似文献
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Preparation,structure, and properties of end‐functionalized miktoarms star‐shaped polybutadiene–sn–poly(styrene–butadiene) rubber 下载免费PDF全文
Two miktoarm star‐shaped rubbers with large‐volume functional groups of 1,1‐diphenylhexyl at the ends of arms (DMS–PB–SBR) and one miktoarm star‐shaped rubber with n‐butyl groups at the ends of arms (BMS–PB–SBR) were prepared by 1,1‐diphenylhexyllithium (DPHLi) and n‐butyl lithium as initiators, respectively. The molecular structures and morphological properties of the three rubbers (MS–PB–SBR) were studied and compared with those acquired from the blend consisting of star‐shaped solution‐polymerized butadiene styrene rubber (S‐SSBR) and butadiene rubber (PBR) prepared by ourselves. The results showed that MS–PB–SBR exhibited a more uniform distribution of PBR phase and a smaller phase size of PBR than that of S‐SSBR/PBR blend. It is found that MS–PB–SBR composites filled with CB showed the lower Payne effect than that of S‐SSBR/PBR/CB composite, suggesting that the MS–PB–SBR/CB composite (particularly the DMS–PB–SBR/CB composites) would possess excellent mechanical properties, high wet‐skid resistance, and low rolling resistance. For the studied MS–PB–SBR systems, the contribution of large‐volume functional groups at the end of PBR molecular chains to decrease the rolling resistance was larger than that of Sn coupling effect. It is envisioned that the miktoarm star‐shaped rubbers with 1,1‐diphenylhexyl groups at the molecular ends would be useful for making treads of green tires. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014 , 131, 40002. 相似文献
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Grafting reaction of solution polymerized styrene butadiene rubbers (SSBR) and 3‐mercaptopropionic acid in situ was investigated in a solid state and a series of SSBR with different polarity degree were prepared through grafting 3‐mercaptopropionic acid onto SSBR chains in the process of mixing. The feasibility of solid‐phase grafting in situ (SPGiS) was verified by 1H‐nuclear magnetic resonance and Fourier transform infrared spectroscopy. Compared with unmodified SSBR/silica compounds, the SSBR/silica compounds with SPGiS exhibited preferable performance in silica dispersion, rubber‐filler interaction, and reinforcing efficiency. The scanning electron microscope and transmission electron microscope showed that silica presented better dispersion and smaller aggregates in the SSBR of SPGiS. Dynamical mechanical analysis of vulcanized rubber compounds with SPGiS showed that the wet skid resistance and the rolling resistance of SSBR/silica compounds were improved separately. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46653. 相似文献
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研究动态硫化EPDM/PP热塑性弹性体相态结构及其力学行为。结果表明:动态硫化EPDM/PP共混物相态是EPDM橡胶以颗粒状分布在PP连续相中,这种相态结构一般不随橡塑比的变化而改变,但EPDM橡胶颗粒的形态变化显著。动态硫化EPDM/PP共混物,在橡塑比小于25/75,共混物具有类似橡胶应力-应变特征。 相似文献