聚酯聚醚多嵌段共聚物表面的XPS研究

用X射线光电子能谱(XPS)研究了一系列PE(?) PTMO多嵌段共聚物——空气界面的化学组成。实验结果表明:在XPS的最大有效取样深度(<5nm)里,样品表面都富集了PTMO软段。硬段含量为24.1 Wt％的共聚物样品,软硬段产生的相分离程度最大。在同一硬段含量下,软段分子量越高,表相中PTMO的富集量越大,溶剂的溶解性越好,表相中PTMO的富集量越大,软硬段的相分离程度愈高。     

一种含硅丙烯酸酯共聚物及表面性能研究

以γ-甲基丙烯酰氧丙基甲氧基三(三甲硅氧基)硅烷和甲基丙烯酸甲酯为原料制备不同硅含量的含硅共聚物.测试了共聚物的Tg、表面接触角、表面自由能,同时对共聚物进行FTIR和表面电子能谱(XPS)分析.结果表明,随着共聚物中硅单体含量的增加,其表面能显著降低,且共聚物在成膜过程中,含硅基团有向共聚物-空气界面富集的趋势.     

聚硅氧烷聚乙烯接枝共聚物的制备与表征

以聚氧乙烯为起始原料,合成了一系列硅表面活性剂以及它们的丙烯酸酯,用FTIR和。HNMR对其结构进行了表征,用最大气泡法测定了其表面张力．以其作为接枝单体,利用反应挤出接枝的方法制备了系列功能化聚乙烯,用FTIR确定了接枝共聚物的结构和接枝率;用DSC、WAXD、接触角测量仪和XPS对接枝共聚物的热性能、结晶行为和表面性能进行了测试分析．结果表明,随着聚氧乙烯相对分子质量的增加,硅表面活性剂的表面活性降低;表面活性剂作为接枝链的引入,降低了接枝共聚物的接触角,提高了接枝共聚物的结晶温度,降低了半结晶时间,但没有破坏聚乙烯的晶格;接枝共聚物的亲水性得到改善．     

聚苯乙烯/聚二甲基硅氧烷接枝共聚物的合成及性能

通过苯乙烯与聚二甲基硅氧烷大单体进行自由基本体聚合反应,合成了不同有机硅含量的聚二甲基硅氧烷接枝聚苯乙烯共聚物,通过红外、核磁、凝胶色谱、动态力学分析、热失重、透射电镜等一系列分析手段表征了该接枝共聚物。对接枝共聚物的力学性能进行测试,结果表明：共聚物的冲击强度和断裂延伸率随有机硅含量的增加而提高,热稳定性也较聚苯乙烯有一定程度的提高。     

含氟聚合物辐射气相接枝研究Ⅱ.PTFE辐射气相接枝共聚物结构表征和性能测试

用扫描电子显微镜（ＳＥＭ）和偏光显微镜（ＰＯＭ）研究了聚四氟乙烯（ＰＴＦＥ）辐射接枝气相丙烯酸（ＡＡ）共聚物膜的表面和断面结构，并分析了膜厚与接枝率的关系，以确证ＰＴＦＥ辐照接枝气相ＡＡ的反应为扩散控制反应．还进一步测试了ＰＴＦＥｇＡＡ膜的亲水性和粘接性能，探寻改性ＰＴＦＥ膜的应用前景     

有机硅聚合物共混改性环氧树脂水分散液的制备、表征及成膜后的性能

用氨基硅油微乳液与水的原位分散方法,制备了有机硅聚合物共混改性接枝环氧树脂水分散液,采用FT—IR、ATR、TEM以及TGA等对该水分散液的粒子形态、粒径以及成膜后的物理性能进行了表征。实验结果表明：与未改性的水分散液相比,改性水分散液的粒径减小,粒径分布变宽,粘度增大。TEM照片表明：有机硅聚合物在分散过程中被包裹在环氧树脂内部,形成“核-壳”结构的复合颗粒。改性水分散液成膜后的疏水、疏油性能和热性能显著提高,表面能降低。膜的超薄切片TEM照片显示：有机硅聚合物在成膜过程中向表面取向与迁移,FT—IR与ATR的测试结果进一步证实它们在膜的表面富集。     

聚丁二烯-α-甲基苯乙烯阳离子接枝共聚物的表征及其力学性能

用OsO_4对聚丁二烯-α-甲基苯乙烯阳离子接枝共聚物进行氧化断链,剖析了接枝共聚反应体系,并测定其支链和均聚物的分子量。使用透射电镜和示差扫描量热仪对接枝共聚物的微相结构进行了研究。测定了含不同量1,2结构的聚丁二烯接枝共聚物的拉伸力学性能。     

含氟聚合物辐射气相接枝研究：ⅡPTFE辐射气相接枝共聚物…

用扫描电子显微镜（ＳＥＭ）和偏光显微镜（ＰＯＭ）研究了聚四氟乙烯（ＰＴＦＥ）辐射接枝气相丙烯酸（ＡＡ）共聚物膜的表面和断面结构，并分析了膜厚与接枝率的关系，以确证ＰＴＦＥ辐照接枝气相ＡＡ的反应为扩散控制反应。还进一步测试了ＰＴＦＥ－ｇ－ＡＡ膜的亲水性和粘接性能，探寻改性ＰＴＦＥ膜的应用前景。     

含羟基苯乙烯/甲基丙烯酸甲酯无规共聚物薄膜的界面行为

通过自由基聚合方法制备一系列含侧羟基的不同苯乙烯含量的苯乙烯和甲基丙烯酸甲酯的无规共聚物(SMMA-r OH),并与含端羟基的不同苯乙烯含量的无规共聚物(SMMA-t OH)对比,研究化学改性硅片表面的界面行为。采用红外光谱(FT-IR)、核磁共振波谱(NMR)等手段进行SMMA-r OH的结构表征。通过测量聚苯乙烯(PS)和聚甲基丙烯酸甲酯(PMMA)两种均聚物、无规共聚物膜的水相与油相接触角得到极性和非极性表面能,计算得到PS和PMMA均聚物与无规共聚物间的界面能,通过引入表面能极性占比参数,对比羟基接枝前后含羟基无规共聚物的表面能。结果表明:在SMMA-r OH中苯乙烯摩尔分数为54%时,PS与无规共聚物间的界面能和与PMMA无规共聚物间界面能相等。SMMA-r OH退火后表面基底覆盖率较高,相比于SMMA-t OH在洗涤前后的界面行为变化较小。证明侧羟基无规共聚物作为基底更适用于嵌段共聚物引导组装的中性基底。     

蒙脱土／水基聚氨酯纳米复合材料的动态力学分析——复合乳液界面变化的影响

以接枝有磺酸钠的聚己二酸1，4-丁二醇酯二醇、Na基蒙脱土等为原料制备了蒙脱土／水基聚氨酯纳米复合物。通过研究复合乳液界面变化对复合物膜动态力学行为的影响，分析了其相态结构与组成的内在联系。结果表明，复合乳液界面层的厚度增大和水合程度降低使复合物膜嵌段结构中软、硬段之间的相容性增加。     

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.     

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     

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

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