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伢典复合树脂高强度纤维——牙周夹板
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《广东牙病防治》 2005年第2期i008-i008,共1页
伢典复合树脂高强度纤维由玻璃纤维和聚合体基质构成,具有独特的互渗透聚合物网络结构(IPN),有效直径为1.2mm,是制作各类牙周夹板(舌侧或腭侧夹板,唇侧夹板,He面夹板,临时牙周夹板,牙外伤固定夹板)的理想产品。
关键词 伢典复合树脂高强度纤维 牙周夹板 聚合体基质 互渗透聚合物网络结构
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Synthesis,characterization and application of PVA/ionic liquid mixed matrix membranes for pervaporation dehydration of isopropanol 被引量:2
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作者 Ganesh B.Thorat Smita Gupta Z.V.P.Murthy 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第10期1402-1411,共10页
In this study,polyvinyl alcohol(PVA)–ionic liquid(IL) membranes were prepared for the separation of isopropyl alcohol(IPA)–water azeotropic mixtures by pervaporation.PVA-IL composite membranes were prepared by simpl... In this study,polyvinyl alcohol(PVA)–ionic liquid(IL) membranes were prepared for the separation of isopropyl alcohol(IPA)–water azeotropic mixtures by pervaporation.PVA-IL composite membranes were prepared by simple solvent evaporation method using four ILs,viz.,1-n-butyl-3-methylimidazolium chloride(BMIMCl),1-hexyl-3-methylimidazolium chloride(HMIMCl),1-hexyl-3-methylimidazolium tetra fluoroborate(HMIMBF4) and 1-octyl-3-methylimidazolium chloride(OMIMCl).Three ILs were used to study the effect of alkyl chain on the pervaporation performance.The study had focused on the effect feed water concentration from 10%–40%and effect of feed temperature from 50–80°C.Physiochemical properties of all the membranes were studied using Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy(SEM) and contact angle measurement.The Arrhenius activation energies for permeation were estimated to be in the range 4–12 kJ·mol-1 from the temperature dependent permeation values. 展开更多
关键词 Composite membranes Ionic liquids Dehydration Isopropanol Pervaporation
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Statistical thermodynamic properties of a new self-condensing vinyl polymerization system
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作者 Zuofei Zhao Yuanfeng Li +1 位作者 Ning Yao Haijun Wang 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第9期1478-1488,共11页
A new self-condensing vinyl polymerization system consisting of *ABf-type inimers is studied by the principle of statistical mechanics. To obtain the relevant average properties of the system, a differential equation ... A new self-condensing vinyl polymerization system consisting of *ABf-type inimers is studied by the principle of statistical mechanics. To obtain the relevant average properties of the system, a differential equation satisfied by the polymeric moment of interest is given, and as a result the zeroth, first, second, and third polymeric moments together with the size distribution function of hyperbranched polymers(HBPs) are explicitly presented. As an application of the method of statistical mechanics, several thermodynamic quantities such as the equilibrium free energy, law of mass action, isothermal compressibility, internal energy, and the specific heat associated with the polymerization are all derived. Furthermore, the scaling behavior of asymptotic size distribution function is discussed, by which a reasonable interpretation of the polydispersity index near the end of polymerization can be made. Also, the expressions of some structural parameters such as the numbers of inimers, terminal units, chain units, branched units, and the degree of branching(DB) are calculated. It is found that a high functionality is helpful to improve the DB of the resultant HBPs. These results show that the functionality f has a significant effect on the thermodynamic quantities and structural properties of HBPs. 展开更多
关键词 partition function law of mass action internal energy and specific heat polydispersity index structural parameter
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