Environmentally responsive core/shell particles via electrohydrodynamic co-jetting of fully miscible polymer solutions

Herein it is demonstrated that electrohydrodynamic co-jetting is not limited to Janus-type particles, but can also be used for the preparation of core/shell particles. Using side-by-side flow of miscible polymer solutions, electrohydrodynamic co-jetting offers an elegant and scalable route towards preparation of core/shell particles with otherwise difficult-to-prepare particle architectures, including particles with hydrophilic shell and core. Throughout this study, electrohydrodynamic co-jetting of aqueous solutions consisting of a mixture of PAAm-co-AA and PAA is used, and a range of different types of particles with distinct compartments are observed. Transition from Janus particles to core/shell particles appears to be caused by changes in the relative conductivity of the two jetting solutions. After crosslinking, the core/shell particles are stable in aqueous solution and exhibit reproducible swelling behavior while maintaining the original core/shell geometry. In addition, the pH-responsiveness of the particles is demonstrated by repeatedly switching the environmental pH between 1.3 and 12. Moreover, the core/shell particles show surprising uptake selectivity. For instance, a 450% increase in uptake of 6-carboxyfluorescein over rhodamine B base is found.     

新型高效硫化剂FSA-55性能分析

中国石油化工股份有限公司抚顺石油化工研究院开发了一种以单质硫为主要原料的硫化剂FSA-55的制备技术。硫化剂FSA-55中硫质量分数为52%~56%,起始分解温度为120~150℃,闪点高达110~125℃,具有良好的安全性能及使用性能。通过与二甲基二硫醚(DMDS)、叔壬基多硫化物(TNPS)、二甲基硫化物(DMS)等传统硫化剂的性质进行对比,硫化剂FSA-55安全性能(闪点)及使用性能(硫含量、分解温度)均有较大提升,基本接近于进口硫化剂二叔丁基多硫化物(SZ54)的指标水平。通过与硫化剂DMDS的应用对比评价可知,该硫化剂具有良好的硫化性能,可完全替代硫化剂DMDS,具有良好的应用前景。     

Effect of temperature on the ageing behaviour of unsaturated ester‐based lubricants

The ageing behaviour of trimethylolpropane trioleate was investigated at different temperatures in a modified rotary bomb test apparatus. Some physicochemical properties of ageing oil samples, such as acid value, kinematic viscosity, and iodine value, were measured. The oil samples were analysed using gas chromatography, gas chromatography‐mass spectrometry, and gel permeation chromatography to assess the influence of temperature on the ageing behaviour of ester‐based oils. The results revealed that an increase in temperature could greatly speed up the ageing reaction and increase the formation of decomposition products. However, the degree of oil ageing remained similar when the same quantity of oxygen was consumed.     

催化与环境友好过程

介绍了几类催化环境友好过程,其中包括：固体酸,碱催化,以水为溶剂的均相催化及不对称催化。另外还对一些环保方面的现有催化过程的改进和新催化工艺的开发作了评述。     

几种纳米添加剂在环境友好润滑剂中的摩擦化学特性

采用机械化学修饰法研制了三种纳米润滑添加剂,二硫化钼(MoS2)、聚四氟乙烯(PTFE)和氟化石墨(CxFy),考察了这些纳米级润滑剂在环境友好润滑剂中的摩擦化学特性。结果发现：这些纳米添加剂在环境友好润滑剂中具有较好的抗磨性能和良好的减摩性能;减摩性能优于常用的极压抗磨剂,其机理是在摩擦副表面形成迁移膜,起“滚动微轴承”的作用。     

Waterborne methylamine adduct as corrosion inhibitor for surface coatings

Soybean oil was epoxidized using peracetic acid prepared in situ from acetic acid and hydrogen peroxide with Dowex 50 W‐8X as a catalyst. The epoxidized soybean oil was allowed to react with methylamine. The resulting adduct was identified and emulsified. The emulsified methylamine adduct was added at different concentrations to an emulsion (styrene/acrylic)‐based paint (blank). The effect of the methylamine adduct concentration on the physical, chemical, and mechanical properties of the paint was studied. Various tests such as metal substrate weight loss, corrosion, blister, and scratch resistance were performed to evaluate the efficiency of the prepared adduct. It was found that there is an optimum concentration at which the methylamine adduct is very effective as a corrosion inhibitor. This concentration is about 0.5% by weight. In comparison with chromate anticorrosive pigment, it was found that the methylamine adduct is superior with more economical and environmental advantages. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 286–296, 2001     

环境友好燃料炼厂的技术要求Ⅱ环境友好燃料炼厂

这部分将简要介绍环境友好燃料炼厂的技术要求,并将这种“清洁”炼厂与传统技术基础上的新炼厂作经济分析比较。这种“清洁”炼厂借助附加的加工步骤消除了当前炼厂中生产的焦炭,这种产品的硫和重金属含量高。将原油的残油经流化床焦化和焦炭气化进行组合加工以生产Ｈ２,并将硫和金属作为有价值的副产品回收。此外,用清洁加工技术尽可能减少其它固体废物和空气／水毒物,该技术主要是用轻烯烃生产环境友好的高级运输燃料。尽管“     

对环境友好燃料炼厂的技术要求：I.美国现状概述

尽管目前对汽油组分影响各种环境条件的理解还有限,但已经认识到,现有燃料中的几种组分若以高浓度释放到大气中,对环境是有害的,如溢漏、挥发损耗或不完全燃烧。这些组分包括芳烃特别是苯、高蒸汽压烃如ｎ－丁烷、反应性烃如烯烃以及硫化合物,它们会促使烟和酸的形成,本文将阐述与当前炼油加工过程有关的这些环境问题     

二氧化碳资源化利用的研究进展

介绍了作为温室气体的主要组成且储量丰富的可再生资源CO_2资源化利用的重要意义和主要方法。综述了将CO_2催化转化成高附加值的燃料、高分子材料、精细化工中间体和药物中间体的各类反应以及CO_2作为环境友好介质的研究进展。重点介绍了CO_2转化成有机碳酸酯及噁唑啉酮类化合物以及超临界CO_2作为环境友好溶剂在药物提取、新型材料制备与加工和有机化学反应等领域的应用。对CO_2资源化利用的发展前景和面临的挑战进行了展望。     

Metal separations of interest to the Chinese metallurgical industry

IBC Advanced Technologies’ Molecular Recognition Technology(MRT) SuperLig products selectively and rapidly bind with target species enabling their selective removal from solutions.The MRT process can produce a high purity separation product of maximum added value at a competitive cost.SuperLig products have high selectivity for many target species which can include metal ions,anions,and neutral molecules.In operation,the SuperLig product is first placed in a packed column.A solution containing a mixture of the target species and other chemical species is then passed through the column.The target species is removed selectively by the SuperLig product,the column is washed to remove residual feed solution,and the target species is recovered by a minimal quantity of eluent.The result is a pure and concentrated species that can be kept for its value or disposed of safely.The process is environmentally and ecologically friendly with no organic solvents being used.This paper provides a review of some examples of applications of MRT to separations of interest to the Chinese metallurgical industry.Included are several applications of MRT,including Pd separations from Pt metal refinery streams and low-grade spent catalyst wastes,Rh recovery from spent auto catalyst and other feeds,Re removal from selected impurity ions,Cd removal from Co electrolyte,Bi removal from Cu electrolyte,In and Ge separations from difficult matrices,and removal of bivalent first transition series and other metal ions from acid mine drainage(Berkeley Pit,Montana).Finally,the potential application of MRT to separations involving the recovery of rare earth metals and Li from low-level waste solutions and end-of-life products is discussed.