CR/MMA/SBS三元接枝共聚胶粘剂的研制

针对CR和CR／MMA二元接枝共聚胶粘粘力低，剥离强度低这一问题，研制了CR／MMA／SBS三元接枝共聚胶粘剂，并测定了该胶粘剂的有关物性，结果表明：该胶粘剂的粘结强度（尤其是初粘强度）和剥离强度有明显的提高，文中叙述了该胶粘剂的制备方法以及主要反应条件对接枝共聚的影响。     

NIKE鞋用胶粘剂及其初粘强度的研究

本文介绍了用CR/MMA接枝共聚和添加少量MgO~-对叔丁酚甲醛树酯预反应物的方法,使氯丁胶粘剂的初粘强度得到提高。该胶粘剂运用于制鞋生产线NIKE运动鞋的生产。     

反相乳液法合成淀粉接枝AM、DM共聚物研究

以淀粉为基材，通过反相乳液聚合法与丙烯酰胺、甲基丙烯酸二甲胺基乙酯进行接枝反应制备共聚物．考察了引发剂种类及用量、乳化剂种类及用量、单体配比、盐类添加剂等因素对单体转化率、接枝率、产物特性粘数的影响．以过硫酸铵-尿素为引发体系，Span20与OP4以40：60质量比配制复配物为乳化剂，其质量分数为7％，pH8，淀粉与单体的质量比为1：1．4，接枝率可达135．4％，产品特性粘数可达1080mL/g．加入甲酸钠产品特性粘数降低；加入乙酸钠和丙酸钠产品特性粘数增加，其中乙酸钠用量为0．3％时，产品特性粘数为1230mL／g．     

高熔体强度聚丙烯的制备及其性能研究

聚丙烯（PP）因其优良性能广泛应用于诸多领域,但同时也有着韧性差,熔体强度低等缺点。而高熔体强度聚丙烯（HMSPP）是一种具有较高熔体强度、较好熔体弹性的聚丙烯树脂,它的发现拓展了聚丙烯在物理发泡、挤出涂布及热成型等领域的应用,多年来一直是聚烯烃研究工作的重点。本文以2,5-二甲基-2,5-双-（叔丁基过氧）己烷（DHBP）为引发剂,采用多官能团单体三羟甲基丙烷三丙烯酸酯（TMPTA）对市售聚丙烯（PP）进行接枝,同时加入支化促进剂二硫化四丁基秋兰姆（TBTDS）以提高接枝效率,成功制备了具有高熔体强度的聚丙烯并进行了配方优化。本文测定了接枝产物的熔体流动速率(MFR)及采用公式法计算熔体强度(MS)。通过红外光谱（IR）对所得高熔体强度聚丙烯的分子结构进行表征,结果表明单体已接枝在PP主链上,通过差示扫描量热法（DSC）、热重分析（TG）方法,对所得高熔体强度聚丙烯的热性能进行分析和表征,结果表明接枝产物的熔融温度没有显著变化,耐热温度有所上升。拉伸强度、弯曲强度、冲击强度等力学性能的测定结果表明接枝产物的力学性能有显著提高。     

BPO—DMA引发氯丁橡胶接枝共聚的研究

研究了温度、时间、BPO-DMA用量配比对MMA接枝CR的影响,得出了能体现该氧化还原引发聚合特征的反应条件。当[BPO]=[DMA]=0.01 mol/1,40℃～55℃反应3 h接枝率可达一峰值(～14％)。XPS和SEM分析结果,证明产物为一接枝共聚物;且接枝率为10～14％时粘接强度迅速增加,接枝聚合的活性中心在CR 双键的α-H位置。     

聚丙烯夹筋水泥包装袋用胶粘剂的研究

以一种新型的高效引发剂,在甲苯-乙酸乙酯混合溶剂中进行氯丁橡胶(CR)与丙烯酸丁酯(BA)的接枝共聚反应。研究了引发剂用量及加入方式、反应温度,单体用量、搅拌方式等因素对CR与BA接枝共聚反应的影响。实验结果表明:在以CR与BA接枝共聚反应过程中,伴有一定的CR降解反应;使用通用型CR3211-BA接枝共聚物配制的胶粘剂在室温下粘结不经表面处理的聚丙烯(PP)编织袋,剥离强度为0.429 kN/m,已达到BG胶的指标(0.39 kN/m);粘结PP-牛皮纸,达到牛皮纸被撕破的强度,可以满足聚丙烯夹筋水泥包装袋的使用要求。     

LDPE-g-MAH/PA-6共混合金的制备与性能

通过选择适当的配方和工艺条件，采用熔融接枝方法制备了马来酸酐接枝低密度聚乙稀样品（LDPE-g-MAH）；并用反应挤出的方法制备了LDPE-g-MAH／PA-6（60／40）共混合金，采用IR、DMA、扫描电镜等手段对共混合金性能进行了表征，并进行了拉伸性能的测试．结果表明，LDPE-g-MAH／PA-6共混合金提高了LDPE接枝物的拉伸强度和抗蠕变性；共混合金形态具有双连续相的互琐结构．     

CR/VAC/MMA/AA四元接枝共聚物合成及接枝率的研究

以醋酸乙烯酯(VAC)、甲基丙烯酸甲酯(MMA)、丙烯酸(AA)为接枝单体,以过氧化二苯甲酰(BPO)为引发剂,在氯丁胶(CR)上进行接枝共聚,制备出CR/VAC/MMA/AA四元接枝共聚物。探讨了提取剂和提取时间对四元接枝共聚物的接枝率测定的影响,并讨论了MMA/VAC配比、AA用量对接枝率和聚合转化率的影响。用红外光谱(IR)和DSC对接枝共聚物进行了表征。结果表明,选用丙酮作提取剂,提取时间为48h,接枝率数据较理想;试验中BPO质量为CR的1.2%-1.5%,CR/VAC/MMA/AA的质量配比为100/45/15/10时,其接枝率和聚合转化率最佳。     

接枝共聚单体与淀粉接枝共聚物上浆性能的研究

以Ｃｅ＾４＋为淀粉接枝引发剂，研究了接枝共聚单体对淀粉接枝共聚物（ＳＧＣ）上浆性能的影响。首先通过实验对丙烯酸（ＡＡ）、丙烯酰胺（ＡＭ）、丙烯酸羟乙酯（ＨＥＡ）、丙烯酸甲酯（ＭＡ）、丙烯酸乙酯（ＥＡ）、丙烯酸丁酯（ＢＡ）、甲基丙烯酸甲酯（ＭＭＡ）、甲基丙烯酸丁酯（ＢＭＡ）、醋酸乙烯酯（ＶＡｃ）和丙烯腈（ＡＮ）１０种接枝单体进行筛选，然后根据所归纳出的ＳＧＣ浆料接枝支链的分子结构模型，探讨了几种组合     

二过碘酸合铜（Ⅲ）钾引发甲基丙烯酸甲酯在尼龙－1010上接枝共聚合反应的研究

本文以二过碘酸合铜（Ⅲ）钾（ＤＰＣ）为自由基引发剂，在尼龙－１０１０上引发甲基丙烯酸甲酯接枝共聚合反应，获得了具有一定接枝效率和接枝百分比的接枝共聚物。对接枝产物用红外光谱和Ｘ－射线衍射光谱进行了表征，测定了反应温度、ｐＨ值、单体用量和引发剂浓度对接枝参数的影响，探讨了该接枝共聚反应的引发机理。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has