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本文提出了一个简单的关系式。在高聚物分子量的粘度法测定中,利用这一关系式,可以把动能改正后的特性粘数极其简便而准确地计算出来。 相似文献
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本文研究了成型加工过程中聚合物熔体的流变特性及其表征,探讨了熔体的非牛顿行为与本构方程的关系。对目前常用的一些本构方程的来源及其发展作了简要的述评,并就其特点和应用进行了初步的分析和讨论。 相似文献
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对影响NiBR分子量及其分布的主要因素的研究表明,采用Al-Ni二元陈化稀B单加方式时,改变进料丁二烯-汽油的温度,可在一定范围内有效地调节聚合物的分子量分布;提高聚合反应温度,聚合物分子量有所3降低;而改变体系中两组催化剂的摩尔比,是在较大范围内灵活调节聚合物分子量的最有效方法。 相似文献
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其实气体的 PVT 关系——状态方程是化工热力学的基础,范德华方程及其修正式如彭一鲁宾逊方程等是较重要且常用的状态方程。范德华方程及其修正式是关于体积 V 的三次方程,范德华方程式: 相似文献
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用紫外/示差双检测器GPC仪,小角激光光散射仪及红外光谱仪测定了苯乙烯(St)-丁烯共聚物的微观结构,分子量及其分布、组成分布及稀溶液特性。实验表明,K树脂是SBS,SB和PS三段聚合物的混合物;在四氢呋喃,甲苯,氯仿和环已烷4种溶剂中,K树脂M基本一致,但其特性粘数与溶剂有关,其大小按溶剂四氢呋喃、甲苯、氯仿、环已烷顺序递减。因产K树脂稀溶液的性质与国外试样基本相似。 相似文献
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The Carnahan-Starling hard-sphere equation of state perturbed by attractive forces expressed in a virial expansion has been studied in the vicinity of the critical point. The three van der Waals conditions for the critical isotherm at the critical point were used to determine the minimum number of terms required in the perturbation series. P-v-T data at other temperatures were used for the determination of the temperature dependence of the virial terms. The equation has been tested for mixtures using the mixing rules of Arai et at. 相似文献
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改性塑料的应用与前景 总被引:2,自引:0,他引:2
论述塑料改性技术的作用,不仅可降低塑料制品的成本,而且还可赋予制品特殊需要的功能性,由于共混,填充改性技术操作简单,因而该技术在聚乙烯(PE),聚丙烯(PP),聚氯乙烯(PVC)等通用塑料的加工中经常使用,其制品广泛应用于工业,农业,建筑,包装及人们日常生活中。并展望了改性塑料的发展前景。 相似文献
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In this work, the Lee-Kesler equation of state has been used together with the extended corresponding states principle. In order to improve the predictability of the equation in a more narrow acentric factor range, two new reference fluids have been chosen. The parameters in the Lee-Kesler equation have been estimated for the two reference fluids, CFC12 (dichlorodifluoromethane) and HFC134a (1,1,1,2-tetrafluoroethane), with the Error-in-Variables Model. This model allows both dependent and independent variables to be subject to errors.
Calculations have been made for the two reference fluids as well as for other compounds, and the predicted thermodynamic properties have been compared with experimental values. Comparative calculations have also been carried out for some of the previously suggested modifications of the Lee-Kesler correlation. 相似文献
Calculations have been made for the two reference fluids as well as for other compounds, and the predicted thermodynamic properties have been compared with experimental values. Comparative calculations have also been carried out for some of the previously suggested modifications of the Lee-Kesler correlation. 相似文献
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The Carnahan-Starling hard-sphere equation of state perturbed by attractive forces expressed in a virial expansion has been studied in the vicinity of the critical point. The three van der Waals conditions for the critical isotherm at the critical point were used to determine the minimum number of terms required in the perturbation series. P-v-T data at other temperatures were used for the determination of the temperature dependence of the virial terms. The equation has been tested for mixtures using the mixing rules of Arai et at. 相似文献
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For calculation of the thermodynamic properties of refrigerants it is proposed that the extended corresponding states principle (ECSP) should be used using two specific reference fluids, CFC12 (CCI2F2) and HFC134a (CF3CH2F), in order to cover the field of interest for most refrigerants. The specific parameters of these refrigerants have been determined for the Lee-Kesler modification of the Benedict-Webb-Rubin equation of state. In the parameter estimation, it has been taken into accounl that all variables are subject to errors by using the so-called Error-in-Variables-Model (EVM). The parameters have been estimated from experimental pressure-volume-temperature data, vapour pressure and saturated liquid and vapour volume data for CFC12 and HFC134a.
The extended corresponding states principle proposed in this work with CFC12 and HFC134a as reference fluids has been used in calculations of the thermodynamic properties of a number of refrigerants. In comparison with the original Lee-Kesler equation this concept gives improved results in calculations of vapour pressure and liquid volume. 相似文献
The extended corresponding states principle proposed in this work with CFC12 and HFC134a as reference fluids has been used in calculations of the thermodynamic properties of a number of refrigerants. In comparison with the original Lee-Kesler equation this concept gives improved results in calculations of vapour pressure and liquid volume. 相似文献
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聚(肉桂酸乙烯基氧乙酯)的合成与表征 总被引:2,自引:0,他引:2
本文报道的是一种聚(肉桂酸乙烯基氧乙酯)负性光致抗蚀剂。它具有分辨力和灵敏度高、粘附性强、显影后很少产生皱胶、针孔罕见、贮存稳定和等离子去胶效果好等优异性能。在—75℃的温度下,向肉桂酸乙烯基氧乙酯单体中注入三氟化硼乙醚引发剂即可发生阳离子聚合,制得聚(肉桂酸乙烯基氧乙酯)。使用精制单体和助催化剂,在低温条件下,可合成出高分子量和高聚合产率的聚(肉桂酸乙烯基氧乙酯)。通过分级试样的光散射和粘度测定确立了相应的Mark-Houwink方程. 这种负胶的光刻最细条宽为0.5μm,适用于1—1.5μm以上条宽的生产工艺。 相似文献