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OMMT/ZDMA协同增强HNBR复合材料的性能研究 总被引:2,自引:0,他引:2
以离子聚合物(ZDMA)、有机蒙脱土作补强剂,采用机械混炼法制备了氢化丁腈橡胶/有机蒙脱土纳米复合材料,研究了OMMT/ZDMA协同作用对氢化丁腈橡胶纳米复合材料性能的影响,并使用扫描电镜(SEM)、热失重分析(TG)、差示扫描量热分析(DSC)及力学性能测试等方法分析了复合材料的结构和性能。结果表明,有机蒙脱土用量较少可达到纳米级分散,材料力学性能得到相应改善;用量较大时,OMMT团聚几率增大,可能形成应力集中点,影响复合材料力学性能。热性能分析表明,加入有机蒙脱土在一定程度上提高了HNBR的热稳定性。 相似文献
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EPDM/有机蒙脱土纳米复合材料的制备和性能研究 总被引:1,自引:0,他引:1
以EPDM接枝马来酸酐作相容剂,用一段密闭熔融混炼、二段开炼机混炼的方法制备了EPDM/有机蒙脱土(OMMT)纳米复合材料,并对其性能进行了研究。结果表明,熔融混炼使EPDM分子链开始插入OMMT片层间,致使OMMT片层间距有所增大;开炼机混炼使OMMT片层间距进一步增大;硫化后,OMMT片层剥离,以纳米级尺寸均匀分布于EPDM基体中。与EPDM胶料相比,EPDM/OMMT纳米复合材料的损耗因子小,玻璃化温度高,储能模量大,物理性能显著提高。 相似文献
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采用机械混炼法制备了丁腈橡胶/氯丁橡胶/有机蒙脱土(NBR/CR/OMMT)纳米复合材料,并对其亚微观结构与性能进行了研究。透射电子显微镜(TEM)观察表明,OMMT以纳米尺寸分散于橡胶基体中,它与橡胶基体具有良好的相容性;OMMT能够明显提高纳米复合材料的表观交联密度;纳米复合材料具有优异的力学性能;与纯NBR/CR共混胶相比,纳米复合材料具有相同的起始分解温度和更高的最快失重温度。 相似文献
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以纳米碳酸钙、普通碳酸钙作为添加剂,以丁苯橡胶(SBR1500)为基体,探讨了混炼条件及纳米级碳酸钙对丁苯橡胶拉伸性能的影响。结果表明,纳米级碳酸钙不仅可以作为一种添加剂,而且可以大大改善丁苯橡胶的拉伸性能。最佳加入量为丁苯橡胶质量与纳米碳酸钙质量比为10050。 相似文献
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由丁腈橡胶СКН-18、聚丙烯(PP)与纳米级蒙脱土(填充剂)共混,制取热塑性弹性体。含少量蒙脱土的热塑性弹性体,其力学性能、热性能及耐溶剂性能均优于不含蒙脱土的热塑性弹性体。往生胶中加入少量蒙脱土(1~3份)制得的热塑性弹性体的性能最佳。 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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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 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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杀虫磺缓释剂杀钉螺试验报告 总被引:1,自引:0,他引:1
杀虫磺缓释剂浸杀成螺、幼螺、螺卵效果好,现场应用缓释片63克/米^2,半年后活螺平均密度下降93.2%,春季施药1次,可达到控制当年钉螺的扩散。 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献