共查询到19条相似文献,搜索用时 187 毫秒
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采用分步聚合法合成了两网质量比不同,第二网交联度均为30%的聚二乙烯基苯/聚丙烯酸甲酯互穿聚合物网络(PDVB-PMA IPN),将它们分别用20%的NaOH/甲醇溶液碱解,合成了一网疏水、一网亲水的聚二乙烯基苯/聚丙烯酸互穿聚合物网络(PDVB-PAA IPN)。测定了两网质量比对树脂的比表面积、平均孔容、孔径以及弱酸交换量的影响。比较了不同树脂对水溶液中苯酚的吸附性能差别,测定了此类树脂的热力学数据,探讨了此类树脂的吸附机理,建立了一种通过溶胀致孔合成吸附树脂的方法。 相似文献
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江芳 《福建信息技术教育》2006,(2)
本实验采用大孔型氯甲基化交联聚苯乙烯为骨架经溶胀剂溶胀,用三乙胺为胺化剂合成大孔型交联聚苯乙烯三乙基苄基氯化铵相转移催化剂。并测定了其交换容量,每克干树脂的交换容量达4.4meq以上。并将此合成的催化剂应用于环己醇的氧化,制备环己酮,效果良好。 相似文献
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聚苯乙烯固载聚乙二醇催化合成邻乙氧基苯酚 总被引:3,自引:0,他引:3
本应用二乙烯苯交联的聚苯乙烯-聚乙二醇(DVB-PS-PEG)树脂作相转移催化剂催化合成了邻乙氧基苯酚,结果表明回收率达80%,催化剂能重复使用,效果良好,并用元素分析、红外,核磁共振对产物进行了表征。 相似文献
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文章合成了具有氢键受体的树脂一大孔交联聚(对硝基苯乙烯),研究了该树脂在环己烷中对含有氢键供体的酚类物质的氢键吸附,进一步证明和完善了氢键吸附理论. 相似文献
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《实验室研究与探索》2013,(10):278-281
采用原子转移自由基聚合法(ATRP)合成了醛基封端的聚甲基丙烯酸丁酯(PBMA),进一步与超支化聚乙烯亚胺(HPEI)通过希夫碱键缩合,制备了两亲性星型超支化聚合物HPEI-star-PBMA。不同于传统的疏水核-亲水臂结构,HPEI-star-PBMA具有亲水核-疏水臂的结构。由于具有两亲性,HPEIstar-PBMA能够自组装形成纳米粒子。同时,亲水核与疏水臂之间的希夫碱连接赋予了聚合物pH响应性,可以通过改变溶液pH调节组装体的形貌。 相似文献
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宁明远 《邵阳学院学报(社会科学版)》1998,(2)
在0.5mol.L~(-1)H_2SO_4—0.5mol.L~(-1)HClO_4介质中,SCN~-离子与 Mo(Ⅴ)形成MoO(SCN)_5~(2-)桔红色络阴离子,可用强磁性阴离子交换树脂吸附富集,进行树脂相分光光度测定,其摩尔吸光系数达 8.96×10~4L·mol~(-1)·cm~(-1),比水相测定的灵敏度高出 8倍以上。钼在 0~1.8mg/L之间服从比耳定律,用于钢中钼的测定,结果令人满意。 相似文献
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林漍 《商情·科学教育家》2013,(19)
本文首先以对苯二甲酸二甲酯(DMT),间苯二甲酸二甲酯5-磺酸钠(SIMP),乙二醇(EG)和聚乙二醇(PEG);聚丙二醇以及共聚醚等合成了系列亲水聚醚酯,然后研究了亲水聚醚酯结构以及溶液浓度、温度等对溶液性质,如表面张力、临界胶束浓度(CMC)、浊点、接触角(θ)等的影响.结果表明:只由PEG等合成的聚醚酯其溶液表面张力值、CMC、浊点是最高,接触角也最大;由PEG/无规共聚醚合成的亲水聚醚酯,其溶液性质的测定值均为最小;而由PEG/PPG合成的亲水聚醚酯溶液这些性质的测定值则居中;浓度越高,聚醚酯溶液平衡表面张力值越小,浊点越低,接触角θ越小. 相似文献
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辐射引发分散聚合制备交联型聚苯乙烯微球的研究 总被引:1,自引:0,他引:1
以聚乙烯吡咯烷酮(PVP)为稳定剂。在乙醉/水介质中,用二乙烯苯(DVB)作交联剂。采用r-射线辐射引发分散聚合技术。进行苯乙烯和丙烯酸的分散共聚合。制得分布较为均匀、粒径在310—690nm大小的单分散交联型聚苯乙烯微球(PS)。考察了分散剂含量、交联剂用量、初始单体浓度、丙烯酸浓度及辐照剂量分别对所得聚合物粒径的影响,研究较适宜的制备条件。 相似文献
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马海珠 《浙江教育学院学报》2006,(4):55-60
利用构象.构型统计方法,推导了均方回转半径和温度系数公式,并对同为单侧基二态模型的聚苯乙烯和聚丙烯酸甲酯链均方回转半径特征比作了计算比较,发现构象能对链无扰尺寸和温度系数的依赖关系是不同的,说明侧基对聚合物性质有重要影响. 相似文献
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This paper focused on the removal and transformation of the dissolved organic matter (DOM) in secondary effluent during the granular activated carbon (GAC) treatment. Using XAD-8/XAD-4 resins, DOM was fractionated into five classes: hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N) and hydrophilic fraction (HPI). Subsequently, the water quality parameters of dissolved organic carbon (DOC), absorbance of ultraviolet light at 254 nm (UV-254), specific ultraviolet light absorbance (SUVA) and trihalomethane formation potential (THMFP) were analyzed for the unfractionated and fractionated water samples. The results showed that the order of the DOC removal with respect to DOM fractions was observed to be HPI〉HPO-A〉HPO-N〉TPI-A〉TPI-N. During the GAC treatment, the THMFP of the unfractionated water samples decreased from 397.4 μg/L to 176.5 μg/L, resulting in a removal efficiency of 55.6%. The removal order of the trilaalomethanes (THMs) precursor was as follows: HPO-A〉TPI-A〉TPI-N〉HPO-N〉HPI. By the GAC treatment, the specific THMFP of HPO-A, TPI-A, TPI-N and the original unfractionated water samples had a noticeable decrease, while that of HPO-N and HPI showed a converse trend. The Fourier transform infrared (FTIR) results showed that the hydroxide groups, carboxylic acids, aliphatic C-H were significantly reduced by GAC treatment. 相似文献
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INTRODUCTIONPolymersinmediumathighdilutionhaveabroadrangeofapplicationsnowadays.Theywereusedaspourpointdepressantandviscosityre ducerofcrudeoilanditsproductssuchasEVAanditsderivatives(SunilKumer,1 989;Qianetal.,1 996;Qianetal.,1 996;Qietal.,1 992 ) ;dragreducerofwater… 相似文献
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Nano-Ag particles/polyacrylamide (PAM) composites were synthesized by γ irradiation method and then blended with ethylene vinyl acetate (EVA). Dielectric behaviors of the Ag/PAM/EVA composites are investigated as a function of both the concentration and size of Ag particles. When concentration of the Ag fillers is rarely low, dielectric anomalies were first observed in contrast to the traditional percolation theory. As concentration of Ag increases, volume resistivity and breakdown field strength are enhanced, loss tangent (tan δ) reduced and dielectric constant kept invariable. In addition, the above variation became larger when the diameter of the Ag nano-particles is smaller. Such dielectric anomalies may be understood by considering the unique "Coulomb Blockade Effect" of the nano-sized Ag particles. 相似文献
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The rheological behavior of polyvinyl acetate (PVAc) in N,N′=dimethylformamide (DMF), methyl ethyl ketone (MEK), 1,2-dichloroethane
(DCE), tetrahydrofuran (THF) and toluene (TOL), polystyrene (PS) in DMF, MEK, DCE, THF and cyclohexane (CYH), and random ethylene-vinyl
acetate (EVA) copolymer in DCE, TOL, CYH with and without surfactant of Span80 and in the DCE/CYH solvent mixtures with surfactant
of Span80 was examined at high dilution. It was shown that the extent and type of the upsweep or downsweep (anomalous rheological
behavior) of the reduced viscosity-concentration curves of these different polymers at high dilution are markedly dependent
on the dielectric constant of the solvent and the polarity of the polymer used. The experimental results indicated that the
anomalous rheological behavior of EVA copolymer, widely used as a flow improver, is related to its efficiency in reducing
viscosity and depressing pour point of crude oil and waxy solvents.
Project (No.29774020) suppored by the Natural Science Foundation of China(NSFC). 相似文献
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采用表观黏度法,以黏度增长因子R为指标,对聚丙烯酰胺(PAM)与聚乙二醇(PEG)在水中的相互作用进行研究,并考察PAM摩尔分数、PEG相对分子质量、剪切速率和温度对其相互作用的影响。结果表明:混合体系中PAM与PEG之间的相互作用表现为表观黏度的降低,主要为疏水、氢键及相互缠结作用等;当体系中PAM的摩尔分数为0.6时,相互作用最强;该作用随PEG相对分子质量的增大而略增强,随剪切速率的增加先增大后减小,随温度的升高先减小后增大。表观黏度法快捷简便,适用于溶液中聚合物分子间相互作用的研究。 相似文献