关于海峡两岸的电子玻纤概况

我国玻纤行业2004年生产总量已经突破60万t大关,其中池窑拉丝产量达到40多万t.这意味着我们玻纤行业又迈上了一个新台阶.我们已经成为世界玻纤第2生产大国并正向着技术强国进军,本文介绍了电子玻纤生产工艺特性;电子玻纤市场现状及其发展前景;海峡两岸电子玻纤生产现状及其发展趋势,希望能使大家对电子玻纤有个更全面的认识.     

全级配混凝土单轴疲劳特性细观数值模拟

为研究全级配混凝土在等幅、变幅及阶梯重复荷载作用下的疲劳特性,揭示材料特性与疲劳应力水平对其疲劳寿命的影响规律,通过自编程序建立二维随机骨料模型,运用有限元软件和耐久性疲劳分析软件进行联合仿真,对全级配混凝土细观结构进行应力分析和疲劳分析,探讨了不同骨料分布、骨料形状及疲劳应力水平对混凝土疲劳性能的影响,并估算了疲劳寿命。结果表明:在阶梯重复荷载作用下,骨料形状和分布对混凝土疲劳寿命影响较小,而疲劳应力水平对疲劳寿命影响较大;圆形和椭圆形骨料混凝土疲劳寿命较高,多边形骨料寿命较低;在疲劳加载破坏过程中,骨料界面先起裂,然后裂纹逐渐扩展贯通,最后导致整个试件完全破坏,可见骨料界面是混凝土中的薄弱部位,其寿命直接影响整个混凝土试件的寿命。研究成果为后续混凝土疲劳性能研究提供了参考。     

GRM-2SD120棉线缠绕机

介绍了GRM－2SD120棉线缠绕机的结构原理，重点介绍了该机的锭子部分，口型部分，锭子盘，中胶部分，传动原理，电气原理及主要技术参数。     

黄色透明热固性丙烯酸树脂的合成与性能研究

采用丙烯酸酯类和铬金属络合染料先配位后聚合的方法,合成了一种黄色热固性丙烯酸树脂,并用红外光谱表征其结构,然后用该树脂配漆并对金银丝进行了涂布处理。研究了该树脂与染料的结合方式以及该树脂配漆涂布后的性能。实验和检测的结果表明该树脂与染料的结合方式不同于传统的热固性树脂,且配漆后表现较好的柔韧性、摩擦牢度和皂洗牢度等,达到工业生产要求标准。     

动态全硫化共混型热塑性弹性体的研究进展

阐述了动态全硫化共混型热塑性弹性体（TPV）的发展历史，微观形态结构及其形成机理，制备技术，主要的品种及其加工和应用。     

同安煤矿4101综放工作面煤氧化自燃的标志性气体研究

煤自然火灾严重威胁着煤炭工业的安全。为了遏制该类火灾的发生,煤自然火灾指标气体的预测预报功能越来越受到人们的重视。本文通过煤氧化反应生产气体的红外光谱实验,分析了同安煤矿4101综放面煤样在升温氧化过程中,在不同温度下煤氧化自燃产生气体的红外光谱图谱,确定了此煤样在氧化自燃过程中在不同温度下出现的标志性气体。建立了标志性气体的预报模型,研究分析了煤样氧化自燃生产的CO、CH_4和C_2H_4气体的浓度与温度的关系。结果表明,4101综放工作面实验煤样氧化自燃生成的气体产物有H_2O、CO_2、CO、CH_4和C_2H_4等5种,CH_4、CO和C_2H_43种气体的浓度随温度的升高有着不同的变化规律。对矿井自燃火灾的预测预报具有重要的指导意义。     

全生物降解PBS的扩链改性研究

采用新型扩链剂2,2′-双(2-噁唑啉)(BOZ)对聚丁二酸丁二醇酯(PBS)进行扩链,研究了BOZ加入量、稳定剂加入量、时间、温度对扩链反应的影响。结果表明,选择最佳条件,扩链后的PBS的相对分子质量较未扩链PBS的相对分子质量大为增加,而且扩链PBS相对分子质量分布与未扩链PBS基本一致,说明PBS扩链后的线性度与起始PBS相同,没有支化或交联反应发生。     

Effect of alkali and ultraviolet (UV) radiation pretreatment on physical and mechanical properties of 1,6‐hexanediol diacrylate–grafted jute yarn by UV radiation

To improve the physicomechanical properties of jute yarn, grafting with 1,6‐hexanediol diacrylate (HDDA) monomer was performed by a UV radiation technique. A series of HDDA solutions of various concentrations in methanol were prepared. A small quantity of photoinitiator (Darocur‐1664) was also added to HDDA solutions. To optimize the conditions for grafting, the effects of monomer concentration, soaking time, and radiation doses were studied by varying the number of soaking times along with variation of monomer concentrations and UV radiation intensities. The extent of polymer loading and the mechanical properties like tensile strength (TS), elongation at break (Eb), and tensile modulus of both treated and untreated jute were investigated. The highest tensile strength, polymer loading, and modulus were achieved with 5% HDDA concentration, 5 min soaking time, and the 4th pass of UV radiation. This set of conditions was selected as optimum and produced enhanced tensile strength (67%), modulus (108%), and polymer loading (11%) over those of virgin fiber. To further improve the mechanical properties the jute yarns were pretreated with alkali (5% NaOH) solution and after that the alkali‐treated yarn were treated under UV radiation of various intensities. The pretreated samples were grafted with optimized monomer concentration (5% HDDA). Increased properties of alkali + UV‐pretreated and grafted samples such as polymer loading (12%), tensile strength (103%), elongation at break (46%), and modulus (114%) were achieved over those of virgin jute yarn. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 18–24, 2004     

二甲基亚砜一步法碳纤维用聚丙烯腈原丝生产工艺

叙述了二甲基亚砜一步法（高转化）高强碳纤维用聚丙烯腈原丝生产的工艺流程。着重讨论了聚合、纺丝的工艺控制。以及工艺控制对聚丙烯腈原丝和最终碳纤维性能的影响。按此工艺生产的聚丙烯腈原丝的质量完全符合高强碳纤维生产的需要。     

A Fully Continuous Supercritical Fluid Extraction System for Contaminated Soil

A fully continuous lab scale supercritical fluid extraction system has been designed, built and tested. The system continuously pumps carbon dioxide under supercritical conditions and soil slurry into a counter‐current contacting column. Delhi Loamy Sand, spiked with approximately 10 mg/g of naphthalene, was used as the testing soil. The soil slurry ranged from 0.0028 g dry soil per g slurry to 0.072 g/g. The operating temperature was 43°C and the operating pressure was 7.7 MPa. Near steady state, fully continuous flow was achieved with runs lasting as long as 2 h. All carbon dioxide samples contained measurable quantities of naphthalene and the measured mass transfer coefficients were as high as 4.6×10^?4 s^?1.