一种POSS掺杂改性聚氨酯水性分散体乳液的制备和性能研究

本文采用化学方法制备了一种多面体低聚倍半硅氧烷（POSS）掺杂改性的聚氨酯水性分散体乳液,并采用投射电镜、扫描电镜、粒径分析、热失重、紫外-可见光吸收和涂膜力学性能等测试手段对该POSS掺杂聚氨酯分散体及其涂膜的微观结构、热、光和力学等性能进行表征和研究。实验结果表明,该乳液具有良好的室温贮存稳定性能（>3月）,POSS与水性聚氨酯分散体具有良好的相容性和协同增强效应。POSS的掺杂改性不仅能够提高聚氨酯涂膜的耐热性能,显著提高水性聚氨酯涂膜的硬度和耐水性,同时该掺杂聚氨酯涂膜还具有优异的抗紫外光能力。     

PU－PDMS涂膜表面疏水性与表面结构

研究了聚氨酯（ＰＵ）与聚二甲基硅氧烷（ＰＤＭＳ）共混涂膜表面疏水性随共混比的变化规律．发现共混涂膜疏水性明显优于纯ＰＵ膜．并且滑动角与共混比关系曲线有最佳点．用Ｘ射线光电子能谱及相差显微镜分析了涂膜的表面化学成份及相分布均一性，阐明了上述现象的原因．     

BC/WPU功能涂膜制备及性能研究

以环保型水性聚氨酯（WPU）作成膜物,把环保、高附加值及功能化作为涂膜设计理念,以低成本竹炭（BC）作功能助剂,旨在合成宜居多功能涂膜,通过BC改性及优化配方制备了BC/WPU功能涂膜。研究了BC改性剂种类、用量和添加量、粒度及分散时间等因素对功能涂膜性能的影响。结果表明：γ-胺丙基三乙氧基硅烷（γ-APTES）改性BC/WPU功能涂膜具有优异的导电、力学性能;在γ-APTES为BC质量的2%、BC用量为20%、BC粒度为500目、分散40 min条件下,制备的涂膜体积电阻率为1.7×104Ω.cm,铅笔硬度为4H,冲击强度≥70kg.cm,耐洗刷性能≥11350次。     

脂肪族水性聚氨酯乳液的研究

采用内乳化法以聚酯多元醇、异佛尔酮二异氰酸酯（IPDI）和二羟甲基丙酸（DMPA）合成了水性聚氨酯乳液。研究了NCO／OH摩尔比对水性聚氨酯粒子尺寸、胶膜耐水性、乳液的电解质稳定性、胶膜的机械性能的影响。制备了稳定的水性聚氨酯乳液。     

防金属重污染水性双组分聚氨酯清漆的研究

以自制水性双组分聚氨酯为基础，从涂料的构成、性质及其配方设计入手，通过正交设计试验，研究了水性双组分聚氨酯清漆的组分、官能团、交联剂及两组分混合方式、涂装方式等对树脂、清漆涂膜的影响．通过一系列试验，确定了适应性和综合性均好的防金属重污染水性双组分聚氨酯清漆双组分的配方、工艺路线和工艺参数，制备了防金属重污染水性双组分聚氨酯清漆的双组分并制成涂膜．检测了所研制的防金属重污染水性双组分聚氨酯清漆树脂产品，并检测了涂膜的各项指标、所制涂膜的耐冲击强度、光泽等达到溶剂型双组分聚氨酯清漆涂膜的性能，硬度、干燥时间接近溶剂型双组分聚氨酯清漆涂膜，并具有优异的防腐蚀性能．     

紫外光固化纳米溶胶／聚氨酯丙烯酸酯杂化材料的制备与性能

以 γ-甲基丙烯酰氧丙基三甲氧基硅烷为原料,采用溶胶－凝胶法合成了可紫外光固化的纳米溶胶,采用红外光谱（FT-IR）、核磁共振（NMR）和透射电镜（SEM）对其结构、粒径大小和分布进行了分析表征。采用聚酯多元醇、甲苯二异氰酸酯（TDI）、丙烯酸羟乙酯（HEA）为原料,合成了聚氨酯丙烯酸酯。利用合成的可紫外光固化的纳米溶胶和聚氨酯丙烯酸酯制备了紫外光固化有机/无机纳米杂化材料,对纳米杂化材料的力学性能进行了测试。实验结果表明,随着纳米溶胶含量的增加,杂化材料的力学性能、附着力等均得到了提高,当纳米溶胶质量分数达到20%时,涂膜硬度可增至3H,纳米溶胶质量分数为10%时涂膜的附着力即可达到最高的0级;纳米粒子在有机相中分散良好。     

环氧树脂改性水性聚氨酯的合成工艺与性能研究

探讨了环氧树脂E-44对水性聚氨酯进行改性，当DMPA含量为5wt％-7wt％，环氧树脂添加量为5wt％-8wt％，采用相反转分散方法时，可得到较稳定的环氧树脂改性水性聚氨酯分散液，且分散液综合性能较好；用环氧树脂改性的水性聚氨酯制备的涂膜具有硬度高，耐水性和耐溶剂性好等特点．     

水性涂料用聚氨酯／丙烯酸酯复合乳液合成技术的研究

大量研究表明，将聚氨酯和聚丙烯酸酯结合在一起得到的聚氨酯／丙烯酸酯复合乳液（PUA）可使涂膜获得更优异的性能，在水性涂料中有重要的应有价值．PUA复合乳液的合成方法对复合组分的相容性以及复合乳液乳胶膜的性能有重要的影响．本文综述了水性聚氨酯／丙烯酸酯复合乳液主要合成方法的研究状况，并对各种方法进行比较．     

鞋用水性聚氨酯胶粘剂的合成及性能研究

采用甲苯二异氰酸酯（TDI）、聚酯多元醇和二羟甲基丙酸（DMPA）为主要原料,经分步预聚后在水中自乳化合成了阴离子型水性聚氨酯胶粘剂．实验表明：DMPA用量、加入方式（粉末加入法或溶解加入法）、反应时间、反应温度及乳化工艺的选择是影响乳液及胶膜性能的主要因素．     

POSS掺杂改性聚氨酯水性分散体乳液的研究

采用化学改性方法制备了一种POSS掺杂改性的聚氨酯水性分散体乳液,并采用投射电镜等多种测试手段对POSS掺杂聚氨酯分散体及其涂膜的微观结构、热、光和力学等性能进行表征和研究.结果表明,该乳液具有良好的室温贮存稳定性能(>90 d),POSS与水性聚氨酯分散体具有良好的相容性和协同增强效应.POSS的掺杂改性不仅能够提高聚氨酯涂膜的耐热性能,显著提高水性聚氨酯涂膜的硬度和耐水性,同时该掺杂聚氨酯涂膜还具有优异的抗紫外光能力.     

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     

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