功能化及工程化PVC树脂的生产与应用

针对国内PVC树脂产业现状,详细介绍了几类具有良好发展前景的功能化及工程化PVC树脂的性能,进一步讨论了这些产品的生产、应用与市场前景。     

Oxidation and colour development in AES resins

Summary The structural changes connected with the beginning of colour development during thermal oxidation of a AES polymer blend have been investigated. The yellowing behaviour of AES has been compared with that of the different components of the blend, and the influence of oxygen partial pressure on the polymer degradation has been determined. Colour changes have been shown to be correlated with the early stages of oxidation, and at the same time the different stabilities of the blend components were verified.     

Determination of the long-term hydrolytic stability of polycarbonate engineering resins

The hydrolytic degradation of polycarbonate resins is a first-order process in terms of the decrease in average molecular weights under a relative humidity (RH) and temperature. Two analysis procedures have been developed for making life-cycle predictions of polycarbonate at any combination of humidity and temperature. The first prediction procedure uses an Arrhenius equation derived for determination of the activation energy of polycarbonate hydrolysis tested at various temperatures under a constant RH. The rate constants at any combination of temperature and RH can be determined for a new resin tested at three or more RHs under a temperature, since the logarithm of the Arrhenius intercept has a linear empirical relationship with RH. The second prediction procedure uses a linear relationship between the logarithm of the rate constant and RH derived from the humid-aging of polycarbonate tested at various RHs under a constant temperature. The rate constants at any combination of temperature and RH can be determined for a new resin tested at three or more temperatures under a RH, since the intercept of the above linear relationship has another linear empirical relationship with temperature.     

PVC糊树脂发展前景

介绍了PVC糊树脂的生产现状及生产工艺。并展望了近阶段的发展前景。指出我国PVC糊树脂产能将在2012年集中释放,高端PVC糊树脂产品需进口补充,但普通PVC糊树脂产品市场供大于求。     

纳米陶瓷的发展及研究现状

综述了纳米陶瓷材料近年来的发展与应用，重点论述了纳米陶瓷的制备、性能及应用现状，并对纳米陶瓷的未来发展进行了展望。     

环氧树脂固化剂研究进展

介绍了近年来环氧树脂固化剂研究的一些最新趋势。     

Selected biotrends in development of epoxy resins and their composites

Epoxy resins and their fibre or particulate composites are widely used in various industries, including building, naval, aircraft, automotive and aerospace. Modern polymer science and technology focus on the development of green polymers and composites. There are two major areas of interest in the case of epoxy resins: the development of bio-based resins and the production of composites with natural fibres. One of the most interesting challenges is developing fully bio-based composites: that is, epoxy resins based on renewable resources and natural fibres. This paper presents a review of literature on epoxy resins and hardeners based on renewable resources (especially vegetable oils) and epoxy composites with natural fibres. We also describe some of the effective methods of improving the mechanical properties of epoxy–natural fibres composites, including chemical modification of the fibre surface and the application of hybrid reinforcements.     

激光清洗的发展历程

20世纪60年代激光在很多领域已得到了应用,80年代起逐渐用于清洗。介绍了这一发展的过程及发展现状。     

氯乙烯系树脂粘附材料的开发

介绍了氯乙烯系树脂在粘附性材料上的应用。阐述了发展趋向,推荐了发展品种,并列举应用实例。     

橡胶弹性体增韧环氧树脂的研究进展

综述了环氧树脂增韧改性的研究现状,详细介绍了丁晴橡胶、丙烯酸酯橡胶和聚氨酯弹性体增韧环氧树脂的研究进展,展望了橡胶弹性体增韧环氧树脂的前号。     

国内PVC专用树脂的现状及发展趋势

介绍了国内PVC行业的发展现状、PVC专用树脂的市场现状和市场上主要的PVC专用树脂品种,指出了PVC专用树脂的发展方向。     

聚烯烃专用树脂开发现状与对策

概述了国内外聚烯烃新产品专用树脂开发现状与发展趋势，分析了我国存在的差距和问题，提出了我国在聚烯烃新产品专用树脂开发上应巩固通用料市场，合理分工，挤占来料加工市场，加强聚合工艺和催化剂成套技术研究及技术储备等对策。     

聚乙烯类管材功能性专用树脂配方体系的研制

深入研究在聚乙烯类管材配方体系中引入废旧同收材料和无机刚性增强粒子,并利用稀上改性技术对无机填料进行活化改性以提高其强度,同时辅以微纳米粉体处理技术,很好地将改性后的无机刚性增强粒子均匀地分散到高分子材料中,改善了高分子粒子的流动性、粒子衔接粘合性和粒子附着力及相关物理特性.     

化学工程发展方向

介绍了化学工程的发展方向:反应过程与分离过程的结合,多个反应过程或多个分离过程的结合,强化化学作用对分离过程的影响及优化化工动态过程。     

文丘里干燥器开发研究

介绍了一种新研究开发的气流干燥器———文丘里干燥器。介绍了文丘里干燥器的结构和工作原理。通过实验证明,喷嘴和文丘里管的结合强化了干燥过程,一、二次风的设置使物料停留时间延长,扩大了该气流干燥器的应用范围。就目前的实验设备(φ400mm、容积0.15m3文丘里干燥器)的实验结果进行分析,文丘里干燥器在系统配置尚不完美的情况下,干燥强度达220kg/(m3·h);对不同物料,其生产能力在864～1440t/a;其分级尺寸为φ250mm时,干燥效果最为理想。