DOP与CPE的含量对BaSO4填充聚氯乙烯基隔音复合材料性能的影响

将邻苯二甲酸二辛酯(DOP)与氯化聚乙烯(CPE)按照不同的质量份数加入到BaSO4填充聚氯乙烯基(PVC)隔音复合材料中,探讨DOP与CPE的含量对BaSO4填充聚氯乙烯基隔音复合材料隔声性能的影响,利用BSWA VS302USB双通道声学分析仪,万能材料试验机,动态热机械分析仪测试了材料的隔声性能,力学性能,阻尼性能。结果显示:当PVC相对质量为100份,DOP为50份,CPE为20份时对低频具有较好的隔声性能,当DOP相对质量为80份,CPE为20份时对中频具有较好的隔声性能,对高频影响较小。     

氯化反式-1,4-聚异戊二烯的制备及其热稳定性研究

采用水相悬浮法,利用盐酸与双氧水反应生成氯气直接对反式-1,4-聚异戊二烯(TPI)进行氯化改性。研究了固含量、反应温度、反应时间、双氧水与盐酸的物质的量比等对氯化反式-1,4-聚异戊二烯(CTPI)氯含量的影响。可获得氯含量在50%以内的CT-PI,产品为可溶解于氯仿等有机溶剂的淡黄色疏松颗粒。通过热分析发现,CTPI在氮气中的热降解为多步反应,在600℃时仍有12%(质量分数)且结构稳定的碳化合物残留。     

聚丁二烯橡胶化学改性技术进展

对聚丁二烯橡胶的氢化，环氧化、氯化及链端改性技术进行了较全面的概述，介绍了聚丁二烯橡胶改性领域的技术进展，提出了应加强对聚丁二烯橡胶的改性研究，改善现有品种的性能，扩大其应用领域。     

Liquid-Liquid Extractions of Microamounts of 137Cs and 85Sr with Chlorinated Dicarbollide and Crown Ethers into Mixed Dodecanenitrile/n-dodecane Nonpolar Diluent

New methods of extraction of ¹³⁷Cs and ⁸⁵Sr into solvent mixture of dodecanenitrile with n-dodecane in the presence of various crown ethers and chlorinated dicarbollide are described. This is the first time when extraction with chlorinated dicarbollide anion was accomplished into a judiciously chosen nonpolar solvent. The theoretical reasoning leading to the choice of such nonpolar solvent is outlined. New crown ethers with laterally branched alkyl chain were synthesized and tested. These, when the same crown moiety is compared, are more effective for Sr²⁺ extraction than the commonly used DC18C6 (18C6 ring moiety), but less effective for Cs⁺ extraction compared with DB21C7 (21C7 moiety). The systems may be used both in analytical applications and, hopefully, after further development, as well in a nuclear reprocessing industry.     

Chain Dechlorination of Organic Chlorinated Compounds in Alcohol Solutions by 60Co γ-Rays, (III)

Chlorinated benzenes dissolved in deoxygenated alkaline 2-propanol were dechlorinated by irradiating with ⁶⁰Co γ-rays to produce the lower chlorinated benzenes and chloride ion. The yield of dechlorination was found to depend on the number of chlorine atoms on the benzene ring, the G (CI^?)-values being, for instance, 6,500, 480 and 2.0 for 0.07 M penta-chlorobenzene, 1, 2, 4-trichlorobenzene, and monochlorobenzene, respectively, in 0.2 M KOH-2-propanol solution. In contrast, the values of G(C1^?) differed little between the isomers of trichlorobenzene. The large difference in G (CI^?) according to the number of chlorine atoms can be explained by considering the redox potential of the chlorinated benzenes and the ketyl radical ion.

Trichlorobenzene is dechlorinated to dichlorobenzene and then to monochlorobenzene while producing potassium chloride and acetone, and consuming hydroxide ion. In the experiment, some chlorinated benzene derivatives were observed to be generated in the course of this process—probably dichlorophenyl-2-propanol and monochlorophenyl-2-propanol, judging from observation by gaschromatograph-mass spectrometer and from the path-way of formation. The observation also indicated the presence of dichlorophenyl-2-propanol in predominant amounts in 1, 3, 5-trichlorobenzene solution, but only in a small fraction in 1, 2, 3-trichlorobenzene.     

Graft copolymers from commercial chlorinated polypropylene via Cu(0)‐mediated atom transfer radical polymerization

Commercially available chlorinated polypropylene has been used as a macroinitiator for the Cu(0)‐mediated atom transfer radical polymerization of methyl methacrylate and tert‐butyl acrylate to obtain well‐defined graft copolymers. The relatively narrow molecular weight distribution in the graft copolymers and linear kinetic plots indicated the controlled nature of the copolymerization reactions. Both Fourier transform infrared and ¹H NMR studies confirmed that the graft reactions had taken place successfully. After graft copolymer formation, tert‐butyl groups of poly(tert‐butyl acrylate) side chains were completely converted into poly(acrylic acid) chains to afford corresponding amphiphilic graft copolymers. © 2016 Society of Chemical Industry     

精细化工氯化蔗糖废水站处理工艺改造

某精细化工厂氯化蔗糖废水处理站原处理工艺出水水质不能达到园区接管标准.针对氯化蔗糖废水的水质特点,在充分利用原有处理设施的基础上,对原处理系统进行了改造,增加了预处理和深度处理.介绍了该工程的背景、改造工艺流程、主要处理构筑物设计参数,总结了工程特点.     

废旧EDPM胶粉再生性能的研究

本文研究了再生温度对废旧三元乙丙橡胶(EPDM)胶粉再生性能的影响,结果表明再生温度低于160℃时,再生效果不佳;再生温度高于180℃时,主链破坏程度增加,再生EPDM胶粉性能下降;再生温度为170℃时,获得最佳再生效果。以石蜡油为软化剂,氯化聚乙烯(CM)为补强填充剂分别研究了它们对EPDM胶粉再生性能的影响。结果表明随石蜡油用量的增加门尼粘度降低,加工性能得以改善但力学性能下降,综合考虑石蜡油用量为10份最合适;CM填充量超过10份时,力学性能高,门尼粘度下降,加工性能得以改善。     

Preparation and characterization of hyperbranched polymer modified montmorillonite/chlorinated butyl rubber damping composites

In this work, Na⁺‐montmorillonite (MMT) was modified by hyperbranched polymer (HBP) and grafted with hindered phenol to improve the damping and other properties of the chlorinated butyl rubber (CIIR) composites. The hyperbranched polymer‐modified montmorillonite (HBP‐OMMT) was prepared by organic montmorillonite (OMMT) that was obtained from the cation exchange reaction between MMT and silane quaternary ammonium salt. The main characterization methods were Fourier transform infrared spectroscopy, hydrogen nuclear magnetic resonance, X‐ray diffraction, scanning electron microscopy, energy dispersive spectrometer, and thermogravimetric (TG) analysis. The basal spacings of MMT, OMMT, and HBP‐OMMT were 1.47, 2.94, and 4.09 nm, respectively. The onset and center temperatures of decomposition (T_?5% and T_max) of HBP‐OMMT were improved from 301 and 369 °C to 332 and 398 °C, respectively. The CIIR damping composites were prepared by mechanical blending of HBP‐OMMT with pure CIIR. The tensile strength and elongation at break of the composites were improved from 5.4 MPa and 890% to 7.6 MPa and 1066%. From TG curves, T_?5% and T_max were increased from 297.4 and 406.0 °C to 323.3 and 410.5 °C, respectively. The dynamic mechanical analysis results showed that tan δ rose from the original 1.20 to 1.44 with the addition of HBP‐OMMT. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43645.     

ACr_2O_4尖晶石氧化物(A=Co,Zn,Mn,Cu)上二氯甲烷的催化燃烧:A位阳离子的影响

采用溶胶-凝胶法制备4种不同ACr_2O_4尖晶石氧化物(A=Co,Zn,Mn,Cu),考察A位阳离子对ACr_2O_4尖晶石氧化物的性质以及对二氯甲烷催化燃烧性能的影响,并对催化剂进行SEM、HRTEM、H_2-TPR、NH_3-TPD以及XPS等表征。结果表明,A位离子显著影响催化剂的可还原性和表面酸性,催化剂催化活性顺序为CoCr_2O_4Zn Cr_2O_4Mn Cr_2O_4CuCr_2O_4。结合表征结果,认为催化剂活性与其可还原性能和表面酸性存在密切关系。CoCr_2O_4由于具有最佳的可还原性和较高的表面酸性,具有最高的催化活性;而CuCr_2O_4由于具有最低的表面酸性导致其催化活性最低。