羧基丁苯胶乳的合成研究

本实验通过对合成丁苯胶乳的单体配比、引发剂种类和用量、电解质、反应温度等工艺条件的探索研究,确定最佳工艺条件,得到了性能优异的羧基丁苯胶乳乳产品。且具有反应速度快,单体转化率高,工艺过程简单等优点。     

交联改性的麦芽糊精生物胶乳的制备及应用

以可再生的麦芽糊精为主要原料,通过一定的改性工艺,制备了可部分代替涂料中羧基丁苯胶乳的生物胶乳.用生物胶乳分别代替预涂涂料中不同比例的羧基丁苯胶乳,研究了其对涂布纸性能的影响.结果表明:用生物胶乳代替预涂涂料中30%,的羧基丁苯胶乳后,涂布纸的白度和平滑度都有一定程度的提高,涂布纸的光泽度和表面强度略有下降,机械强度变化不大.     

建筑密封膏用醋丙乳液胶粒的羧基化处理

合成了一系列醋酸乙烯-丙烯酸丁酯-丙烯酸等单体共聚乳液样品,研究了聚合条件对乳液胶粒表面羧基分布的影响,并对其碱增稠性进行了讨论.结果表明,因聚合物组成、条件不同,胶粒表面羧基分布有明显的不同,而且具有不同的碱增稠特性.     

三光气界面缩聚法合成高分子质量聚碳酸酯

以双酚A（BPA）和三光气（BTC）为单体，在水／CH2Cl2两相体系中，通过界面缩聚的方法合成了高分子质量的聚碳酸酯（PC）．讨论了单体摩尔配比、氢氧化钠用量和油相浓度对聚合物分子质量的影响．在三光气／双酚A／NaOH摩尔比为1.25／3．00／7．50，油相浓度为0．2mol／L时，得到特性黏度为3.41dL／g的PC．用FT—IR确定了聚合物的结构．PC的玻璃化转变温度为158．5℃，TG结果表明，高分子质量的PC起始分解温度为402℃，具有很好的热稳定性．     

次氯酸钠氧化淀粉的制备工艺研究

以木薯淀粉为原料，用次氯酸钠作氧化剂制备粉状氧化淀粉，研究了pH值、氧化剂用量、反应温度、反应时间对产品羧基含量的影响．实验条件下，最佳工艺条件的pH值为9．0、氧化剂用量为25％、反应温度为45℃、反应时间为3小时．     

THE EFFECTS OF BINDER ON COATING RHEOLOGICAL PROPERTIES *

胶粘剂是影响涂料流变特性的主要因素．本文对常用的氧化淀粉、羧基丁苯胶乳和聚乙烯醇在不同的添加量情况下配成的涂料进行了系统的研究．研究结果表明,涂料都呈剪切稀化特性,认为可用修改的幂律方程表达,其中幂指数为剪切速率的函数,该方程体现了流体流动类型对剪切速率的依赖性;当胶粘剂为聚乙烯醇时稠度系数Ｋ最大,为氧化淀粉时次之,为羧基丁苯胶乳时最小．同时也对氧化淀粉、羧基丁苯胶乳、ＣＭＣ和ＰＶＡ混合配制的涂料进行了研究,在剪切速率为１０３／ｓ以下时,体系都呈剪切稀化特性,表观粘度与剪切速率呈幂指数函数关系,且幂指数为剪切速率的函数．在相同条件下,涂料表观粘度在含有ＣＭＣ时最大,含有ＰＶＡ时次之,含有羧基丁苯胶乳时最小．     

PDMDAAC-AM共聚物的反相乳液聚合研究

研究了用二甲基二烯丙基氯化铵(DimethylDiallylAmmoniumChloride，DMDAAC)和丙烯酰胺(Acylamide，AM)为原料。以煤油为分散剂，在反相乳液环境中合成PDMDAAC-AM(Poly DMDAAC—AM)的方法．从反相乳液聚合的机理出发。研究了油水体积比、引发剂的用量、单体配比、引发温度和反应温度等因素对共聚产物的特性黏度和转化率的影响，确定了最佳反应条件．在DMDAAC／AM=2：8，油水比为3：7，采用过硫酸钾为引发剂，其用量为体系总质量的0．05％的条件下，采用逐步聚合的方法得到了固含量为45％，特性黏度为800．5cm^3／g，溶解迅速且絮凝效果好的产品．     

St-BA-羧基单体无皂乳液聚合的研究

研究了苯乙烯、丙烯酸丁酯和羧基单体（甲基丙烯酸和衣康酸）无皂乳液聚合，考察了引发剂（Ｋ２Ｓ２Ｏ８）浓度、电解质（ＮａＣｌ）浓度和甲基丙烯酸与衣康酸配比改变对乳胶粒径和表面羧基含量的影响。实验结果表明：引发剂浓度是影响粒径大小的重要因素；当ｎ（甲基丙烯酸）：ｎ（衣康酸）＝１：１时，乳胶粒表面羧基含量最高。采用无皂乳液聚合，可制得表面羧基含量高、粒径较大且具有单分散的Ｓｔ－ＢＡ－ＭＡＡ－ＩＡ乳液。     

端羧基/羟基丙烯酸正丁酯聚合物的合成

研究了丙烯酸正丁酯在两种链转移剂巯基乙酸（TGA）和巯基乙醇（TEG）存在下的自由基聚合反应，合成了具有端羧基或端羟基的丙烯酸正丁酯聚合物，并用IR，NMR，GPC，酸碱滴定等方法对其进行了表征，以1／Pn对[S]／[M]作图求出了两种链转移剂在聚合条件下的链转移常数，讨论了端基官能团化的比率，滴定法和GPC法得到的TGA的链转移常数分别为0．64，0．67，滴定法得出TEG的链转移常数为0．67，保持单体和引发剂的摩尔比（100：1）不变，当单体与链转移剂的摩尔比大于0．02时，端基官能团化的比例可达85％以上。     

四元共聚型丁腈橡胶的合成、表征及性能研究

以丁二烯、丙烯腈、含羧基单体和共聚型防老剂为原料,制备了新型高性能羧基丁腈橡胶.研究了引发体系和聚合温度对聚合反应的影响;利用TEM观察了不同加料方式对于胶乳粒径形态的影响.实验结果表明,过硫酸盐类引发体系、较高的温度使聚合反应速率增大;通过适时加料方式能得到粒径分布窄、平均粒径大的胶乳;制备的丁腈橡胶与LZSH N-32和Lanxess 3445相比,在燃油B、4050润滑油、1#、3#标准油中体积变化率及机械性能损失最小.     

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

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