增粘树脂与丙烯酸酯共存下的乳液聚合行为

将多种增粘树脂溶解在丙烯酸单体中，预乳化后参与乳液聚合。并研究了其乳液聚合反应行为，讨论了乳化剂、引发剂、保护胶体、增粘树脂选择以及其最佳用量，确定了最佳反应条件，得到与塑料粘结力高且贮存稳定性高、单体转化率达到99%以上的丙烯酸酯共聚物乳液。并用IR和DSC分析表征了溶有增粘树脂的丙烯酸乳液聚合物，可以证明的是单体都参与了聚合反应，加入的增粘树脂种类不同会影响聚合物的Tg值。通过试验发现当两种增粘树脂配比达到最佳值时，可以得到性能最好的胶粘剂。     

液体洗涤剂的增粘技术

本文研究了液体洗涤剂的增粘技术,从理论和实践上阐述了表面活性剂类型和增粘剂选用对增粘效果的影响,为提高产品质量,开发新品种提供了思路。     

饲料用粘着及增粘剂

日本研制成一种含有聚丙烯酸钠和愈疮胶的饲用粘着及增粘剂。聚丙烯酸钠与愈疮胶的最适混合比为1:0.1～10。该饲料用粘着和增粘剂可用于颗粒饲料、混合饲料等的粘着和增粘。其最适添加量为饲料的     

吐温80对PVC增塑糊降粘机理研究

通过对不同PVC增塑糊粘度与凝胶化时间的测试,以及吐温80在糊树脂表面吸附量的分析,讨论了表面活性剂对糊粘度影响的可能作用机理.结果表明:3种增塑糊的凝胶化时间依次为IPPP＜ DINP＜DOA,增塑糊粘度则相反.表面活性剂吐温80对增塑糊的降粘效果最佳.吐温80的降粘机理在于其在PVC糊树脂表面的优先吸附,从而阻碍了增塑剂对糊树脂颗粒表面的吸附、浸润与溶胀、溶解等作用,因此,使得增塑糊的凝胶化延迟.吐温80的饱和吸附量约为7.23 mg/100 gPVC树脂.     

酚醛丙烯酸酯季铵盐感光树脂的合成及光交联

通过酚醛环氧树脂中环氧基的开环反应及酯化反应，合成了可望作为水显影液体光固化材料基本成分的水溶性酚醛丙烯酸酯季铵盐树脂，比较了两种官能团导入次序不同时的丙烯酸转化率．对由不同反应物配比所制得的产物的水溶性、光交联程度、稀释性单体的影响及光交联膜的一些性能作了研究     

我院所产W_(2-1)树脂应用简介

由酚醛环氧树脂与甲基丙烯酸反应合成的酚醛环氧型乙烯基酯树脂(简称W_(2-1)树脂),是一类新型的耐热、耐化学腐蚀树脂。由于它具有与通用不饱和聚酯树脂相似的、良好的工艺操作性能,以及与骨架环氧树脂相接近的优良的物理特性,因而自六十年代中期该类树脂问世以来发展迅速。1979年初,我院高分子研究室着手该项研究工作。后在本院化工厂进行扩大中试和多方面应用试验,结果证明:W_(2-1)树脂工艺性能良好,质量稳定可靠,应用效     

酚醛丙烯酸酯季铵盐感光树脂的合成及光交联

通过酚醛环氧树脂中环氧基的开环反应及酯化反应，合成了可望作为水显影液体光固化材料基本成分的水溶性酚醛丙烯酸酯季铵盐树脂，比较了两种官能团导人次序不同时的丙烯酸转化率．对由不同反应物配比所制得的产物的水溶性、光交联程度、稀释性单体的影响及光交联膜的一些性能作了研究．     

湿固反应型聚氨酯热熔胶粘剂剥离强度影响因素的研究

本文制备湿固型MDI-聚醚基聚氨酯热熔胶，研究了MDI-聚醚预聚物结构、增粘树脂等对胶粘剂剥离强度的影响。     

炭纤维/沥青树脂复合材料的性能研究

以不同地区的催化裂化油浆为原料，与对苯二甲醇反应，得到不同性能的沥青树脂。分别以沥青树脂和酚醛为基体与炭纤维复合，通过模压成型，得到实验室复合材料试样。考察了沥青树脂的软化点、残炭值、树脂含量等指标与炭纤维／书寸脂复合材料的抗冲击强度、层间剪切强度等力学性能的关系。结果表明，沥青树脂基的炭纤维复合材料表现出的力学性能优于酚醛树脂复合材料，并间接证明了沥青树脂与炭纤维有较强的亲和性。     

低粘度酚醛改性松香树脂的合成

介绍了低粘度酚醛改性松香树脂的合成方法，给出了最佳的合成工艺条件。探讨了不同烷基酚、缩合反应温度、顺酐加入量等对产品质量的影响，并就产品的质量指标、红外谱图与进口产品进行了分析比较。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~