共查询到20条相似文献,搜索用时 78 毫秒
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《世界橡胶工业》2016,(1)
研究了填充各种填料的天然橡胶的性能。使用的填料分别为高耐磨炭黑N330、导电炭黑XE2-B和碳纳米管(CNT),应用了未处理的和经声振处理的碳纳米管(简称分别为U-CNT和S-CNT)。填料用量由0份变化到8.0份。研究发现,随着填料用量增大,胶料黏度增大,硫化时间减小,交联密度增大,模量和硬度增大。对于填充N330和XE2-B的胶料,填料用量增大,拉伸强度持续增大。对于填充U-CNT和S-CNT的胶料,在添加量小于2.0份时,拉伸强度随用量增大而增大;大于2.0份后则明显减小。在填料用量相同的情况下,填充碳纳米管的胶料的导电性、导热性、贮能模量和损耗因子的测量值最大,其次分别是XE2-B和N330。试验结果表明,在没有表面活性剂的前提下,对碳纳米管进行声振处理并不能改善其混炼时的分散度,因此,U-CNT和S-CNT填充胶料的性能没有明显区别。 相似文献
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《弹性体》2020,(2)
选用碳纳米管(CNTs)作为补强填料,研究了CNTs的用量对三元乙丙橡胶(EPDM)硫化特性、力学性能、压缩永久变形、耐磨耗性能及导热性能的影响,并表征了CNTs在EPDM中的分散情况。结果表明,随着CNTs用量的增加,胶料最小转矩和最大转矩增大,焦烧时间和正硫化时间变小;胶料的拉伸强度随着CNTs的增加先增大后减小,撕裂强度逐渐变大,拉断伸长率逐渐减小,且在高温拉伸条件下力学性能有所下降,但变化率随着CNTs的增加而逐渐减小;加入CNTs后,胶料的压缩永久变形逐渐变大,耐磨性能和导热性能逐渐变好;通过扫描电子显微镜观察断裂面发现,CNTs在胶料整体分散均匀,但局部存在团聚现象。 相似文献
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研究环氧树脂/金属氧化物硫化体系对氯丁橡胶(CR)性能的影响。结果表明:环氧树脂对CR具有增塑和抗焦烧作用;与金属氧化物硫化体系相比,环氧树脂/金属氧化物硫化体系胶料硬度和拉断永久变形较大,300%定伸应力和拉伸强度较小,弹性较好,老化后拉伸强度变化率较小,拉断伸长率变化率较大;随着环氧树脂用量增大,环氧树脂/氧化镁/氧化锌硫化体系胶料的硬度增大,300%定伸应力变化不大,拉伸强度、拉断伸长率和撕裂强度减小,回弹性提高;环氧树脂用量为4~6份的环氧树脂/金属氧化物硫化体系胶料综合性能较好。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献