PDS的合成及其对聚合烯耐辐射性能的影响

使用不同配比的４－（甲基丙烯酸）－２，２，６，６－四甲基哌啶醇酯和苯乙烯，改变引发剂ＡＩＢＮ的用量，合成了一系列具有不同单体配比和相对分子质量的ＴＭＰＭ和共聚物（ＰＤＳ），研究了它们对聚丙烯耐γ辐射性能的影响。当ＴＭＰＭ和Ｓｔ的质量比为２：１￣１：２，引发剂的用量占单体总质量的０．５％￣１％时，合成的ＰＤＳ作为光稳定剂添加到聚丙烯中后，聚丙烯的耐辐射性能最好。     

功能型阳离子聚合物乳液的性能研究

苯乙烯（ＳＴ）、丙烯酸丁酯（ＢＡ）在无乳化剂条件下,加入少量的阳离子单体Ｎ,Ｎ二甲基Ｎ丁基Ｎ甲基丙烯酰氧乙基溴化铵（ＤＢＭＥＡ）,在引发剂偶氮二异丁基脒盐酸盐（ＡＩＢＡ）作用下,合成了一系列粒子分散均一、表面干净的功能型阳离子共聚物乳液．深入考察了引发剂浓度、共聚单体浓度、离子强度、ＳＴ／ＢＡ主单体配比对粒径（ＤＷ）、粒子数目（ＮＰ）及表面电荷密度的影响,结果表明：可以通过以上各因素来控制胶乳粒子的粒径、粒子数目和粒子表面电荷密度,通过ＤＳＣ分析了胶膜的结构性能．     

乙烯系单体自由基聚合的阻聚效应(ⅩⅪ)——羟胺类化合物对苯乙烯—甲基丙烯酸甲酯共聚合的影响

研究了二乙基羟胺（ＤＥＨＡ）、二异丙基羟胺（ＤＩＰＨＡ）和吗啉羟胺（ＭＰＨＡ）对偶氮二异丁腈（ＡＩＢＮ）引发的苯乙烯（Ｍ１）－甲基丙烯酸甲酯（Ｍ２）在６０℃共聚合的行为．结果表明,３种羟胺对Ｓｔ－ＭＭＡ共聚合表现出不同的阻聚功效,它们的阻聚活性次序为ＤＥＨＡ＞ＤＩＰＨＡ＞ＭＰＨＡ．同时观察到Ｓｔ－ＭＭＡ共聚合竞聚率发生变化,随着所用羟胺的浓度加大,Ｓｔ－ＭＭＡ交替共聚合倾向增大．此外还讨论了聚合温度对诱导期、共聚合速率和共聚物组成的影响．     

乳聚天然橡胶IPN型热塑性弹性体的合成

以天然胶乳为种子乳液，苯乙烯（Ｓｔ），甲基丙烯酸甲酯（ＭＭＡ），丙烯腈（ＡＮ），丙烯酸异冰片酯（ＩＢＡ）等单体或它们的共混物为互穿单体，油酸为稳定剂，二乙烯苯为交联剂，叔丁基过氧化氢／四乙烯五胺为氧化还原引发体系，采用种子乳液聚合法制备出乳胶粒外壳呈硬聚合物梯度分布的复合乳液，经絮凝干燥得固体聚合物。考察了互穿单体的种类和用量，交联剂用量及溶胀时间等对材料力学的影响。结果表明，溶胀时间对聚合物力学     

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。     

悬浮交联共聚物的粒度分布

以明胶为分散剂,Ｎ,Ｎ’－亚甲基双丙烯酰胺（双ＡＭ）为交联剂,进行了甲基丙烯酸甲酯（ＭＭＡ）和丙烯酸甲酯（ＭＡ）的悬浮交联共聚合反应,研究了分散剂、引发剂、交联剂用量搅拌转速水油比及单体配比对聚合物粒径分布的影响．     

醋酸乙烯酯与丙烯酸甲酯的种子乳液聚合

以过硫酸铵（ＡＰＳ）为引发剂,对丙烯酸甲酯（ＭＡ）的乳液聚合进行了研究,得出在ＭＡ／Ｈ２Ｏ重量比为０．５时,６０℃下合成粒径分布均匀的聚合烯酸甲酯（ＰＭＡ）种子乳液的最佳配方为：十二烷基硫酸钠（ＳＤＳ）、（ＡＰＳ）和（ＮａＨＣＯ３）的浓度分别为１１．６、１．７２和４．６９ｍｍｏｌ／Ｌ。然后以ＰＭＡ乳液为种子,以油溶性偶氮二异丁腈（ＡＩＢＡ）为引发剂,分别进行不溶胀与溶胀条件下醋酸乙烯酯（ＶＡ）的种     

醋酸乙烯酯与丙烯酸甲酯的种子乳液聚合

以过硫酸铵（ＡＰＳ）为引发剂,对丙烯酸甲酯（ＭＡ）的乳液聚合进行了研究,得出在ＭＡ／Ｈ２Ｏ重量比为０．５时,６０℃下合成粒径分布均匀的聚丙烯酸甲酯（ＰＭＡ）种子乳液的最佳配方为：十二烷基硫酸钠（ＳＤＳ）、（ＡＰＳ）和（ＮａＨＣＯ３）的浓度分别为１１．６、１．７２和４．６９ｍｍｏｌ／Ｌ．然后以ＰＭＡ乳液为种子,以油溶性偶氮二异丁腈（ＡＩＢＡ）为引发剂,分别进行不溶胀与溶胀条件下醋酸乙烯酯（ＶＡ）的种子乳液聚合,并以磷钨酸为染色剂,用透射电子显微镜（ＴＥＭ）对胶粒形态进行了表征     

苯乙烯／丙烯酸丁酯／（二甲基丁基）甲基丙烯酰氧乙基溴化铵无皂阳离子乳液研究

在无皂条件下，利用偶氮二异丁基脒盐酸盐（ＡＩＢＡ）作引发剂，探讨苯乙烯／丙烯酸丁酯／（二甲基丁基）甲基丙烯酰氧乙基溴化铵（Ｓｔ／ＢＡ／ＤＭＢＭＥＡＢ）三元阳离子共聚物乳液制备的合理条件，通过电镜观察到粒子形态规则、大小均一．功能性单体ＤＭＢＭＥＡＢ是以甲基丙烯酸二甲胺基乙酯和正溴丁烷为原料，选择乙腈作溶剂合成的，制取的最终产品纯度高、收率高     

含氢聚硅氧烷／丙烯酸丁酯复合乳液的研究：———影响乳液流变性及反？…

详细讨论了在一次加料法制备含聚硅氧烷（ＰＨＭＳ）／丙烯酸丁酯（ＢＡ）复合乳液中,单体、乳化剂、引发剂及反应温度对聚合反应速率、转化／率和乳液流变性能的影响。结果表明：ＰＨＭＳ／ＢＡ复合乳液的表观活化能和聚合速率方程分别为：Ｅａ＝１３２．７７ｋＪ／ｍｏｌ,Ｒｐ∞［ＰＨＭＳ］＾－１．３９［Ｉ］＾０．８５［Ｅ］＾０．７５（Ｉ为引发剂,Ｅ为乳化剂）。该乳液呈假塑性流体特征,随ＰＨＭＳ、功能单体Ｎ－羟甲基丙     

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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