ABS树脂冲击强度影响因素的分析

文章结合生产实际讨论了影响ABS树脂冲击强度的主要因素,提出可以通过控制EBR胶乳、ABS粉料结枝度、SAN结合腈含量以及掺混助剂来提高ABS树脂的冲击强度,以期改善产品质量。     

不同AS对ABS树脂性能的影响

通过研究不同分子量和丙烯腈含量的AS树脂,与大沽化HRG粉料和适量的助剂进行掺混试验,以确定不同分子量和丙烯腈含量对ABS树脂性能的影响,指出不同类型、不同用途的ABS树脂需选用适宜分子量的SAN;SAN的丙烯腈含量对ABS树脂的力学性能和加工流动性影响较小。     

ABS树脂产品中污染粒子的质量调查及改进措施

对兰州石化公司ABS树脂生产过程中影响产品质量的重要因素——污染粒子产生的原因进行简要的分析,针对如何消除ABS树脂中的污染粒子提出了改进对策,在生产中取得较好的效果。     

ABS树脂改性酚醛胶粘剂的研究

本文着重阐述了用ABS树脂对酚醛树脂的改性及各种因素对粘接强度的影响,通过差热分析(DTA)和红外光谱分析等手段,对ABS与酚醛的反应机理及固化产物的性能从理论上作了初步探索与说明。在制胶过程中,对使用新型的反应性溶剂以及固化反应催化剂和交联促进剂等进行了一些尝试。结果表明。经过ABS改性后的酚醛胶粘剂,在粘接强度、耐热性等方面都有了很大的改善与提高。     

DCS在化工装置上的应用

本装置是以丁二烯为原料,采用乳液聚合法制备聚丁二烯胶乳(EBR胶乳)用笨乙烯、丙烯晴以乳液接枝共聚法制备ABS粉料,以悬浮聚合法制备ABS珠料,然后采用共掺混法将ABS粉料、SAN珠料和添加剂制成ABS树脂产品。装置采用了先进的DCS控制,使得控制手段更加可靠,装置生产工序共为七个生产工序,即:配料工序、EBR胶乳生产工序、ABS粉料生产工序、SAN珠料生产工序、掺混、挤压、造粒、包装工序、废水处理工序、空气压缩工序。     

DCS在化工装置上的应用

本装置是以丁二烯为原料,采用乳液聚合法制备聚丁二烯胶乳（EBR胶乳）用笨乙烯、丙烯晴以乳液接枝共聚法制备ABS粉料,以悬浮聚合法制备ABS珠料,然后采用共掺混法将ABS粉料、SAN珠料和添加剂制成ABS树脂产品.装置采用了先进的DCS控制,使得控制手段更加可靠,装置生产工序共为七个生产工序,即:配料工序、EBR胶乳生产工序、ABS粉料生产工序、SAN珠料生产工序、掺混、挤压、造粒、包装工序、废水处理工序、空气压缩工序.     

复合胶本体聚合法增韧ABS合成及结构与性能

以镍系高顺式聚丁二烯橡胶（Ni-9004）、锂系低顺式聚丁二烯橡胶（Li-700A）及二者的复合胶做增韧改性剂,用本体聚合法合成了聚（丙烯腈-丁二烯-苯乙烯）（ABS）树脂,考察了聚合时间、复合胶用量对ABS聚合反应、接枝参数和微观形态的影响,并对复合胶不同配比下树脂形态及性能进行了研究.结果表明：随聚合时间的延长,Ni-9004的接枝率增大,而接枝效率和橡胶相体积分数均有所降低;聚合中发生明显的相转变,最终形态为经典的＂核-壳＂结构.当与Li-700A复合时,其形态可得到明显改善,且复合胶用量低时,有利于接枝和包藏,补强值为正;复合胶用量增加,粒子尺寸增大,补强值为负.另外,掺混入Ni-9004可显著提高Li-700A的增韧效果,当掺混量达75%时,在产品的拉伸性能得以保持的同时,Izod缺口冲击强度提高了150%以上.     

均匀设计法对ABS树脂表面金属化条件的选择

将CuCl2、Pb(Ac)2含量一定的ABS树脂薄膜于一定浓度的NaBH4水溶液中处理一段时间,就能得到导电性能良好的导电薄板.影响其导电性能的因素包括添加树脂的质量,添加金属的质量,还原剂浓度,还原时间和还原温度等,因为影响因素较多,本文采用均匀设计法进行试验,分析各个因素对导电薄膜的影响作用.     

无卤阻燃ABS树脂的开发

研究了复合阻燃剂不同组分对ABS树脂性能的影响,并研究了复合阻燃剂添加量和不同ABS树脂型号对体系的影响。当选用磷系阻燃剂/线性酚醛树脂/硼酸锌复配,且加入量为20份时,可使ABS树脂达到UL94 V-0级;选用不同ABS树脂后,发现选用ABS 3型可使无卤阻燃ABS树脂的综合性能达到最佳。     

ABS树脂中游离AS的分子量及分子量分布的快速测定

<正> ABS树脂是众所周知的热塑性工程塑料。由于它的综合性能好,用途广,我国正在大力发展此品种。有关ABS树脂的结构分析以及与性能之间的关系,已有不少研究者进行了卓有成效的工作。我们对兰州化学工业公司合成橡胶厂的ABS树脂等,也初步进行了组成比、接枝效率,以及游离AS的分子量及分子量分布与性能之关系的探讨。到目前为止,对测定ABS树脂中游离AS的分子量及分子量分布,都是用有机溶剂经几步相分离后(若溶液不清晰,还须用2万—4万/分钟的高速离心机进行分离),得到纯的游离AS组分,再用凝胶渗透色谱(GPC)等     

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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