特性粘数测定中动能改正的简易计算法

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。     

含侧氨基聚二甲基硅氧烷MHS方程的订正

通过测定含侧氨基聚二甲基硅氧烷聚合物的数均分子量和特性粘数,对MHS方程中的常数K和α进行了订正,得到的MHS方程表述为:[η]=3.21×10-4Mn0.66。     

聚合物粘度的测量标准及特性粘数的获得

介绍粘度测量的一般思路，列举出测量粘度的标准名称，简要叙述了高分子溶液特性粘数的获得方法。     

修正的PR方程用于液氮洗工艺的计算

通过流程模拟软件Aspen Plus,采用物性修正后的PR方程对低温液氮洗工艺装置进行了模拟计算.结果 表明:修正后的PR方程用于板翅式换热器计算时换热量的计算较为准确.针对液氮洗涤塔的模拟计算与设计值也较为吻合,修正的PR方程可用于低温液氮洗深冷工艺的模拟.     

聚合物熔体非牛顿行为及其本构方程

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。     

NiBR分子量及其分布的调节

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。     

真实气体范德华状态方程及其修正式的改写式

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:     

聚丙烯熔体流动指数与分子量及其分布的关系

研究了聚丙烯(PP)的熔体流动指数(MI)与聚合物不同分子量之间的关联性,对于分子量分布较窄的PP,数均分子量(Mn)、重均分子量(Mw)和粘均分子量(Mv)均能较好的关联;反之,MI与Mn关联性下降,而MI与Mn和Mv的关联性仍很好,尤其是MI与Mv的关联性受分子量分布的影响很小;MI与Z均分子量的关联性很差。同时．确定了MI与各种分子量之间的关联式,该式用于本体PP工艺反应器内氢气浓度的计算和MI的预测,与实验测量结果吻合良好。     

改性ABS及其在汽车上的应用

综述汽车用改性ABS的特点、主要性能、关键要求及应用情况等,并介绍了市场上供应的主要汽车用改性ABS的牌号及主要性能,指出了各种改性ABS和具体汽车制件之间的对应关系以及改性ABS在汽车上的发展前景。     

改性塑料的应用与前景

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。     

RATIONAL CONSTRUCTION OF AN AUGMENTED HARD CORE EQUATION OF STATE FOR PURE COMPOUNDS AND STUDY OF ITS APPLICATION TO MIXTURES

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.     

EVALUATION OF THE ORIGINAL AND THE MODIFIED LEE-KESLER EQUATION OF STATE

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.     

RATIONAL CONSTRUCTION OF AN AUGMENTED HARD CORE EQUATION OF STATE FOR PURE COMPOUNDS AND STUDY OF ITS APPLICATION TO MIXTURES

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.     

A MODIFIED LEE-KESLER EQUATION OF STATE FOR REFRIGERANTS

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.     

热塑性复合材料本构方程及应用

近年来,许多新型复合材料不断涌现,如热固性复合材料和热塑性复合材料等。这些材料在航空、航天、建筑等领域得到日益广泛的应用。因此,对这些材料力学性能的研究已引起国内外高度重视。本文根据弹性理论,考虑到流体不可压缩的条件,分析热塑性复合材料的力学性能,得出粘性各向异性、横观各向同性材料本构关系;通过细观力学研究,导出材料的粘性参数η11,η12,η22,η23;通过对层合板力学变形的研究,导出粘性各向异性层合板的膜应力和应变速率之间的关系及其实际粘性参数η-ij′,并对所得结果进行讨论。     

IMPROVED LIQUID DENSITIES WITH MODIFIED PENG—ROBINSON EQUATION

The Peng-Robinson equation gives poor results when used to calculate liquid phase densities. In order to improve the calculated liquid phase densities, the b constant in the Peng-Robinson equation has been expressed as a linear function of temperatrue. Preliminary evaluation indicates that this modification significantly improves predicted liquid densities for pure components.     

聚（肉桂酸乙烯基氧乙酯）的合成与表征

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。     

THE MODIFIED PGR EQUATION OF STATE: ASYMMETRIC MIXTURE VLE REPRESENTATIONS AND PREDICTIONS

A set of mixing rules was proposed for the modified Park-Gasem-Robinson (PGR) equation of state (EOS) to extend its predictions to mixtures. The phase behavior predictive capability of this segment-segment interaction model was evaluated for selected binary asymmetric mixtures involving ethane, carbon dioxide, and hydrogen in normal paraffins. The predicted bubble point pressures for the ethane + n-paraffin and carbon dioxide + n-paraffin binaries were compared to those of the Peng-Robinson (PR), simplified perturbed hard-chain theory (SPHCT), and original PGR equations. The a priori predictive capability of the modified PGR EOS is significantly better than that of the PR, SPHCT, and original PGR equations of state for ethane binaries with absolute-average percent deviation (%AAD) of 5%. However, this EOS produces comparable representations for ethane binaries (%AAD of 1.9%) and carbon dioxide binaries (%AAD of 2.0). For hydrogen binaries, the modified PGR EOS showed much better representations (%AAD of 1.7) than the original PGR equation and was comparable to the PR equation.