含羧基取代的三氟苯乙烯聚合物的制备及性能

以4-羧基苯硼酸、苯硼酸和溴代三氟乙烯为原料合成了4-(1,2,2-三氟乙烯基)苯甲酸乙酯和α,β,β-三氟苯乙烯。以4-(1,2,2-三氟乙烯基)苯甲酸乙酯为单体经乳液聚合得到单聚物a,以4-(1,2,2-三氟乙烯基)苯甲酸乙酯和α,β,β-三氟苯乙烯为单体经乳液聚合得到共聚物b,聚合物a和b经水解后分别得到含羧基取代的三氟苯乙烯聚合物c和d。成膜后的聚合物c和d在20~100℃范围内的质子传导率范围分别为1.22×10~(-3)~2.64×10~(-3) S/cm和1.96×10~(-3)~2.66×10~(-3) S/cm。热重分析表明这些聚合物热稳定性优良(td330℃),并且该类膜表现出一定的氧化稳定性。     

姜黄素与葛藤总黄酮共递送W/O/W型乳剂的制备研究

本研究旨在提高难溶性抗氧化药物姜黄素和葛藤总黄酮的稳定性和水溶性,将姜黄素和葛藤总黄酮共组装成稳定的新型W/O/W型复乳,并研究其制备工艺.采用手工法和机械法制备乳剂,以形态、粒径及稳定性参数为标准,对研磨时间、乳化剂的种类、维生素C的加入量等因素进行考察,筛选最优处方.结果表明,研磨时间为60 min,乳化剂为吐温80,维生素C加入量为药量8倍且采用机械法制备时,成功制备姜黄素和葛藤总黄酮共递送的W/O/W型乳剂,乳剂形态完整且粒径较均一,平均粒径21±3μm.这种复乳形式成功的提高了姜黄素和葛藤总黄酮的稳定性和水溶性,为不同抗氧化活性物质的有效共递送提供一种新的思路.     

新型丙烯酸酯聚合物的合成及其在棉织物上的应用

从三氯氧磷和N-羟乙基哌嗪出发,经多步反应合成了一种含有磷酰胺基的丙烯酸酯单体,该单体与含氟丙烯酸酯及其他功能性单体经乳液聚合形成了含氟共聚物PA1和不含氟的聚合物PA2.将这两种聚合物应用于棉织物整理,并对整理后的棉织物性能进行了测试.聚合物PA1具有良好的拒水性能和一定的阻燃性能,经其处理后的棉织物表面对水接触角为140°,其极限氧指数(LOI)为23.4%;而经过PA2整理的棉织物具有相对较好的阻燃性能,其LOI值为26.3%.     

北京市怀柔区耕地土壤养分演变特征研究

为实现精准施肥,提升区域耕地质量,基于2011～2017年耕地土壤养分监测结果,采用加权加法、方差分析法、克里金插值法和经典统计分析法,开展北京市怀柔区耕地土壤5种养分指标含量及其变化特征研究。结果表明,2011～2017年全区耕地肥力总体上呈上升趋势,土壤养分综合指数由65提升至73;南部平原区和北部深山区肥力水平高于西部两沟区和中部浅山区;总体上各区域七年土壤养分综合指数均呈上升趋势,其中南部平原区与北部深山区上升幅度较小,西部两沟区与中部浅山区上升幅度较大。研究结果对于指导怀柔区农业生产具有重要意义。     

基于固定股利支付比率的企业盈余可持续性优化模型及实证

借助 Ohlson 模型中股票内在价值与会计信息之间准确的数学逻辑关系,假定企业按利润大小的固定比率支付给股东股利, 在借鉴 Kormendi 和 Lipe 盈余可持续模型的基础上,运用 Ohlson 模型对 Kormendi 和 Lipe 的盈余可持续模型进行了优化, 并构建出了更符合现实条件的盈余可持续性指标模型.接着, 对求得的盈余可持续性指标和 Kormendi 和 Lipe 的盈余可持续性指标的有用性进行了比较性的实证检验. 我国 34 家上市公司的意外盈余反应系数的实证分析表明: 所求的盈余可持续性优化模型对我国上市公司的盈余反应系数具有更强的相关性, 从而进一步证明了该模型更符合现实假设之下的盈余可持续性模型的有用性.     

Synthesis and Application of a Novel Perfluorooctylated Citric Acid

A novel perfluorooctylated citric acid was synthesized successfully via allylation of triethyl citrate followed by perfluorooctylation, reduction and hydrolysis. The fabrics treated with this compound showed good oil repellent and moderate water repellent properties; the oil repellent rating and the water repellent score were 6 and 80 respectively. Even after 10 washing cycles, the repellent properties were kept at the same level. The finished fabrics also showed some wrinkle-resistant properties, and the dry wrinkle recovery angle was increased by 53°compared with untreated fabrics. The critical surface energy of the treated fabric surface was 20±1 mN/m. This multifunctional compound also showed good water solubility, which would be beneficial for the environmental protection.     

浅议政治管理的激励机制

本文从政治管理的激励机制理论探求入手,设计激励机制,引入激励机制的运行模式,并把三者融合起来形成政治管理的激励系统;同时强调要加强政治管理中的伦理、道德建设。     

Synthesis and Application of a Polymeric Crosslinking Agent for Improving Fixation of Vinylsulfone-type Dyes on Cotton by a Pad-drycure Process

A new class of novel polymeric crosslinging agent （NPCA）, which contained silane coupling group and the epoxy groups, was designed and synthesized in our laboratory. NPCA was a non-formaldehyde multifunctional crosslinking polymer. The cotton fabrics dyed with 8.0% （owf） Vinylsulpone-type dyes were treated with 3.0%- 4.0% NPCA, 0.5 mol/L potassium thiocyanate as a catalyst, then padded through two dips and two nips to reach a wet pickup of 80%- 85%, then dried at 80℃ for 2 minutes and cured in oven at 140- 150℃ for 3 minutes. Crocking fastness and fixation （%） were improved with up to 1.0 -1. 5 units, 35%- 50%, respectively. And there was little difference between the color yield of dyed fabrics before and after the treatment at certain conditions. The possible crosslinking mechanism of NPCA was also investigated. It was concluded that NPCA can improve colorfastness of cotton fabric by means of the three-dimensional network, covalent bonding and other molecular forces.     

Synthesis of Novel Fluorinated Acrylate Co-polymers and Their Application on Cotton Fabrics

Two novel fluorinated acrylate monomers 4a and 4b containing perfluorohexyl group were designed and synthesized starting from 4-allylanisole and perfluorohexyl iodide.The monomers 4a and 4b were then copolymerized with octadecyl acrylate and 2-hydroxyethyl acrylate by emulsion polymerization to give copolymers PFA 1 and PFA 2 respectively.The co-polymers were characterized by FT-IR and their heat stability was measured by TGA.The surface properties of PFA 1 and PFA 2 were studied by applying on cotton fabrics.The treated cotton fabrics showed good water-repellent property,and the contact angles for water reached 142° for PFA 1 and 136° for PFA 2.     

可转换债券转换比率模型

将可转换债券看作内嵌期权和内含债券的组合物,从投资者一般投资心理考虑问题,即投资者是否投资取决于投资收益率大于其事先设定的投资收益率底线的可能性,得到可转换债券转换比率模型.通过模型的解发现:可转换债券转换比率仅仅与可转换债券内嵌期权和内含债券两者收益率均值、方差以及两者的相关系数有关,转换比率是内生变量.模型提供了客观确定可转换债券转换比率的方法和理论指导.