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丙烯腈-苯乙烯-丙烯酸酯共聚物的流变性能 总被引:1,自引:0,他引:1
王艳芳;崔玲玲;徐保良;滕谋勇 《中国塑料》2010,24(3):45-48
用毛细管流变仪测试了丙烯腈-苯乙烯-丙烯酸酯(ASA)树脂的表观黏度、黏流活化能、非牛顿指数等流变参数,讨论了剪切速率、剪切应力、温度对ASA的表观黏度的影响,研究了黏流活化能与剪切速率的变化规律。结果表明,随着温度升高, 共聚物的表观黏度下降,非牛顿指数增大;随着剪切速率的增大,树脂的黏流活化能降低;其非牛顿指数n小于1,说明ASA是典型的假塑性流体。 相似文献
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《塑料科技》2015,(11):23-27
采用共混的方法制备了聚丙烯/氧化镧(PP/La2O3)复合材料,研究了La2O3用量对复合材料结晶性能和流变性能的影响。结果表明:La2O3对PP具有明显的成核作用,提高了复合材料的相对结晶度;PP/La2O3复合体系的表观黏度随着剪切速率和温度的提高而逐渐降低;随着La2O3用量的增加,PP/La2O3复合体系的表观黏度先减小后增加,在La2O3用量为0.5份时达到最小值;复合材料的非牛顿指数随着温度的升高而增大,随着La2O3用量的增加先增大后减小;复合材料的黏流活化能随着剪切速率的增加而逐渐降低,随着La2O3用量的增加先减小后增大,但总体呈下降趋势。 相似文献
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《塑料科技》2016,(1)
采用共混的方法制备了聚乳酸/聚磷酸铵(PLA/APP)复合材料,并通过极限氧指数(LOI)和流变性能测试研究了APP的添加对PLA阻燃性能和流变性能的影响。结果表明:APP对PLA材料具有显著的阻燃作用,在其用量为10份时,PLA/APP复合材料的LOI值可达到36.2%;PLA/APP复合材料熔体的表观黏度随着剪切速率和温度的提升而逐渐减小,并且随着APP用量的增加呈先升后降趋势;复合材料的非牛顿指数随着温度的升高而增大,并且随着APP用量的增加呈先升后降趋势;复合材料熔体的黏流活化能随着剪切速率的增加而减小,并且随着APP用量的增加呈先减小后增大趋势。 相似文献
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《塑料科技》2016,(10):44-48
利用机械共混的方法制备了聚酰胺66/十二烷基苯磺酸钠(PA66/SDBS)复合材料,研究了SDBS的用量对该复合材料抗静电性能和流变性能的影响。结果表明:适量SDBS的添加,可降低PA66/SDBS复合材料的体积电阻率和表面电阻率,从而有效改善复合材料的抗静电性能。PA66/SDBS复合材料的表观黏度随着剪切速率和温度的提高而逐渐降低,随着SDBS用量的增加呈先降后升趋势。PA66/SDBS复合材料的非牛顿指数随温度的升高而增大,随SDBS用量的增加先增大后减小。PA66/SDBS复合材料熔体的黏流活化能随剪切速率的提升而减小,随SDBS用量的增加先减小后增大。 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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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