Recovery of monomers and fillers from high-temperature-vulcanized silicone rubbers—combined effects of solvent, base and fillers

The depolymerization of high-temperature-vulcanized (HTV) silicone rubbers containing filler silica and alumina into cyclosiloxane monomers and spontaneous recovery of fillers were studied. First, HTV silicone rubber was treated with different types of solvents in the presence of KOH to find that a triad mixture of diethylamine, methanol and hexane was appropriate not only to dissolve the silicone rubber to a suspension but also to separate fillers completely by filtration. The filtrate was distilled to remove solvent first and then give pure cyclosiloxane monomers in 76–84% yields. Second, the rubbers were treated with other types of triad mixture of solvents and bases, e.g. tetramethylammonium hydroxide, hexane and diethylamine. After filtration, residue was again treated with the amine and hexane to recover clean fillers in 83–93% yields. Cyclosiloxane monomers were also obtained from the combined filtrates in 67–78% yields.     

铸型尼龙改性的研究进展

铸型尼龙产品广泛地用于各种机械零件，改性后的铸型尼龙，可克服其自身的缺点，满足工业应用的要求。文章就我国近年来在铸型尼龙改性研究方面的情况及不同的改性方法做了详细的介绍。     

Monomer recycling for vulcanized silicone rubbers in the form of cyclosiloxane monomers. Role of acid buffers

The KOH-catalyzed depolymerization of vulcanized silicone rubbers to reproduce cyclosiloxane monomers was studied. First, the depolymerization was carried out in toluene with varying amounts of KOH to find that the yield of monomers first increased and then decreased with the increment of KOH, the highest yield was 65% at the molar ratio KOH/(Si–O) UNITS=0.08. At the molar ratio 0.13 in the absence of solvent, the monomers yield was 46%. However, when an acid buffer such as KH₂PO₄ and KCOOC₆H₄COOH was added after the KOH-catalyzed depolymerization was over, the product yield was increased remarkably to more than 80%.     

微细粒技术在洁净煤技术中的作用和地位

从煤加工利用对颗粒粒度及其分布的要求，解离度对超纯煤的制备以及煤炭组分工业化分离的影响等方面论述了微细粒技术在洁净煤技术中的作用和地位。研究表明煤的粒度及其分布对水煤浆制备及其利用，燃烧等有极其重要的影响；     

Internet Studies and Development Discourses: The Cases of China and India

This paper investigates Internet studies in two leading developing countries (i.e. China and India) and finds that the Chinese scholarly community relies on the discourse of liberation from the state as a form of critique, whereas Indian Internet studies question the discourse of modernization to contemplate about the success and failure factors of information and communication technologies in development. The difference generally reflects the academic responses to the development discourses embraced by the two governments. We suggest that Internet studies should not only respond to the realities but also transcend the contextual constraints to direct attention to the often neglected dimensions of development, which are to make actual impacts through allowing the people and the communities to define their own development discourses as well as building research institutions that are oriented to influence policy-making.     

高兹劳动解放思想及其对和谐社会建设的意义

高兹的劳动解放思想是其思想体系的重要组成部分。高兹通过对现代西方发达资本主义社会的批判,阐述劳动解放实现的路径和目标。高兹的劳动解放思想是解读高兹劳动总体思想体系的切入口。它深化了马克思的劳动解放思想,却由于其人本主义的价值立场又有明显的局限性,只是一个理论的乌托邦,但对中国的和谐社会建设具有重要的理论和现实意义。     

Review of Community Psychology: In Pursuit of Liberation and Well-being.

Reviews the book Community Psychology: In Pursuit of Liberation and Well-being, edited by Geoffrey Nelson and Isaac Prilleltensky (2005). As their subtitle suggests, the authors are concerned with many matters beyond a mental health focus. Although they modestly describe themselves as "editors," Nelson and Prilleltensky actually wrote most of the book, with only Parts 5 and 6 devoted to the work of others. In Part I, the authors introduce their project for community psychology, offering "issues, values, and tools for liberation and well-being." In Part II, "Values, Principles, and Conceptual Tools," the authors talk about sources of values and the way values are chosen to inform research and action. Part III, "Tools for Action," is devoted to interventions at various levels: social, organizational, small group, and individual. In Part IV, the authors present "Tools for Research." Part V presents diverse topics that include marginalization; globalization, poverty, and social justice; colonization and racism; immigration, adaptation, and the challenges of cultural diversity. Part VI, a final "look toward the future," talks about the new aims and definitions of community psychology presented by this text. This books is one of those rare texts that fully meets the twin purposes of providing ideas for the mature community psychologist as well as working as a text for advanced students. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

用Ce~(4 )为引发剂的MMA真丝接枝的研究

本文对由 Ce~(4 )引发的、在真丝上的 MMA(甲基丙烯酸甲酯)接技共聚的反应体系,进行了研究。实验结果表明,接枝反应的速率取决于引发剂及单体的浓度,反应温度和真丝性质的差异。此外,还研究了不同种类稀土离子 Ce~(4 )和硫酸铜浓度对该反应速率的影响。     

二季戊四醇六丙烯酸酯的合成及其固化涂料(英文)

利用二季戊四醇与丙烯酸的反应合成了二季戊四醇六丙烯酸酯．将二季戊四醇六丙烯酸酯作为高反应性的单体加入光固化涂料体系,制得了高硬度、高耐磨性的涂层体系．     

双单体接枝聚丙烯的制备及性能研究

研究了以苯乙烯（St）为共聚单体,聚丙烯（PP）熔融接枝丙烯酸（AA）的反应工艺。探讨了AA、共聚单体及引发剂用量等因素对接枝反应的影响。通过FTIR分析证实,AA和St接枝到PP链上形成PP-g-AASt接枝物,并且随着引发剂DCP用量的增大,接枝率呈现先升后降的趋势。通过TGA、WAXD及DSC等方法表征了接枝物的热性能和结晶性能。结果表明,随着接枝产物的接枝率的提高,其分解温度及最大失重率温度先上升,维持一段后再下降。而AA和St主要接枝在PP表面上,未破坏原来的晶型,少量的AA有利于结晶成核,提高结晶度。