聚氨酯树脂应用及研究

就聚氨酯树脂的应用现状进行综述，着重概括聚氨酯在泡沫、弹性体。涂科、合成革、胶粘剂和弹性纤维等方面的应用情况，并介绍目前国内外的研究进展。     

加快山西聚氨酯产业的开发

简述了山西省聚氨酯产业的发展历程和现状。作者认为，从山西省实际出发，在开发聚氨酯产品方面，应适度发展聚氨酯泡沫，重点生产弹性体（包括微空），相应开发特种用途的粘合剂与涂料（油漆）等。     

聚六亚甲基碳酸酯聚氨酯脲的合成研究

由己二醇和碳酸二苯酯通过酯交换反应合成聚碳酸酯二醇，再使用两步法先后与MDI和乙二胺反应，制备聚六亚甲基碳酸酯聚氨酯脲(PCUU)，并对聚合物进行了拉伸试验、IR、DSC、DMA等分析。研究结果表明，PCUU存在硬段／软段微相分离以及聚碳酸酯聚氨酯脲的化学结构，微相分离程度受硬段含量、软段相对分子质量等因素所影响；PCUU的玻璃化转变温度在-14℃以下，在室温表现出橡胶特性；PCUU的软硬段具有合适的硬段含量和软段分子量的PCUU能达到最佳的抗张强度。     

单组分聚氨酯清漆的研制

本文研制的单组分聚氨酯清漆是由豆油、季成四醇、苯酐，经醇解、酯化，再与甲苯二异氰酸酯反应，加入催干剂制备而成。该涂料与醇酸树脂涂料相比，具有干燥时间短、耐磨性好、光泽高，耐水解性及耐酸、盐、碱性较好的特点。     

聚氨酯涂层液温度对涂层织物透湿性的影响

采用湿法涂层技术在SMS基布上进行聚氨酯涂层．通过对透湿量进行测试，并采用电子扫描电镜对膜形态进行观察，研究了涂层织物透湿性和聚氨酯涂层液温度之间的关系．研究结果表明，随着涂层液温度的增加，透湿量降低，原因是聚氨酯大分子在较高温度时分子伸展变直．通过电镜照片发现随着PU涂层液温度的增加，PU大分子的活动性增加，导致孔的数目和直径都在减小．     

聚氨酯涂料概述

概述了聚氨酯涂料的分类以及各种聚氨酯涂料的制造机理，特性和用途，并提出了今后发展的建议。     

反应注射成型聚氨酯／乙烯基酯树脂互穿聚合物网络的形态…

将不同比例的聚环氧丙烷三元醇和工业生产的接枝聚环氧丙烷三元醇昆合，与甲苯一异氰酸酯或碳二亚胺改性二苯甲烷二异氰酸酯快速反应，合成了两类聚氨酯／乙烯酯脂互穿聚合物网络。用扫描电镜观察了它们的拉伸断面以及经ＤＳＣ的测定，结果表明，添加少量工业接枝聚醚多元醇，由ＴＤＩ合成的ＩＰＮ，其两个络间的相容性有较显著的改善，显示出好的拉伸性能。然而，Ｌ－ＭＤＩ合成的ＩＰＮ，随工业接枝聚醚多元醇的加入，网格间的相容     

预聚型聚氨酯涂料的研制

由松香及二甘醇等合成醇酸树脂多元醇与ＴＤＩ反应制备了预聚型聚酯涂料，讨论了醇酸树脂多元醇、氨酯化反应的工艺等因素对聚氨酯涂料性能的影响，性能测试表明，该漆干燥速度快，理化性能优异，质优价廉，具有广阔的应用前景。     

抗拉伸抗凝血性聚氨酯材料的研究

本通过减少扩链剂的用量在聚合物内部形成支链及环形结构，从而合成出具有较高强度的聚氨酯，断裂伸长率达1914％，抗张强度达4303N/cm^2．血小板粘附实验表明，通过在硬段处引入适当长度的烷基侧链，可对硬段提供屏蔽作用，材料在疲劳过程中不易使微相分离结构受到破坏，从而使抗凝血性能稳定．     

聚氨酯非等温催化交联反应动力学研究

用差示扫描量热法（ＤＳＣ）研究了以有机锡和叔胺类混合物为催化剂，以三羟甲基丙烷为交联剂的聚酯型聚氨酯体系的非等温催化交联反应动力学过程。结果表明，各反应特征温度和反应动力学参数与催化剂的浓度呈非线性关系。催化剂的适宜浓度为０．０５￣０．０７５ｍｏｌ。它可使交联反庆温度降低８４．５８度，反应区间缩短９０．４７度，固化率提高１１．７６％，反应活化能降低４８．４％，反应速率提高３倍多。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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