共查询到19条相似文献,搜索用时 122 毫秒
1.
聚硅氧烷-聚醚接枝共聚物的合成及其碱金属盐络合物离子电导的研究 总被引:1,自引:0,他引:1
本文采用环氧乙烷与环氧丙烷共聚合成了一系列低分子量的聚醚(PEP),并用PEP的单烯丙基醚借助氢化硅烷基化反应(Hydrosilylation)制备出一种新型聚硅氧烷接枝聚醚的高分子电解质主体材料(PAEPS).分别讨论了共聚物组成、盐的种类和浓度等因素对交联PAEPS与碱金属盐络合物电解质膜离子电导的影响.结果表明,PAEPS与碱金属盐络合物的室温电导率较纯线型PEO提高两至三个数量级,电导率随温度变化关系基本上符合VTF方程,属于典型的非晶电解质行为. 相似文献
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新型梳状高分子固体电解质的研究(Ⅱ) 总被引:2,自引:0,他引:2
新型梳状高分子固体电解质的研究(Ⅱ)丁黎明,林云青,梁洪泽,汪东梅,王佛松(中国科学院长春应用化学研究所长春130022)关键词梳状高分子,NaCIO_4络合物,固体电解质,离子电导率聚环氧乙烷(PEO)可以溶解多种碱金属盐并形成络合物,这种络合物具... 相似文献
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用于锂离子电池聚合物电解质的组成、结构和性能 总被引:1,自引:0,他引:1
聚合物电解质是全固态锂离子电池的重要组成部分, 其电导率对电池的性能有很重要的影响.本文综述了聚合物电解质的组成、结构和性能对锂 离子电池导电率影响的最新研究进展,特别是介绍了聚合物-碱金属盐复合电解质和聚离子体电解质两个体系的研究进展. 相似文献
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1967年C.J.Pedersen发表了关于冠醚(环聚醚)及其金属络合物的研究以来,冠醚对金属离子的特殊络合作用引起了人们极大的兴趣。碱金属冠醚络合物的发现不仅对络合物本身是个新的发展。 相似文献
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采用溶剂聚合法, 将一种自制新型超支化聚醚(PHEMO)与异氰酸酯在电解液中进行缩合反应, 生成了一种包含有电解液的新型超支化聚醚聚氨酯(PHEU)聚合物电解质. 利用傅里叶红外光谱(FTIR)、示差扫描量热分析(DSC)、热重分析(TGA)和交流阻抗谱等测试方法对PHEU的结构、热稳定性能和离子电导率进行了研究. 研究结果表明, 当电解液中锂盐的浓度为3 mol/L, 电解液的质量为骨架材料质量加和的3倍时, 电解质体系的室温电导率可达到6.12×10-4 S/cm; 电化学稳定窗口为2.2—4.0 V, 具有良好的热稳定性和优良的机械性能. 另外, 在这种新型的电解质中, 聚氨酯大分子将电解液小分子牢固地包裹在里面, 有效地防止了凝胶聚合物电解质的漏液问题, 从而可以提高电池的安全性能. 相似文献
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一种新型聚合物固体电解质的导电性的研究 总被引:3,自引:0,他引:3
自从1975年Wright等[1]首次发现了PEO 碱金属盐络合物的离子导电性后,人们对不同类型的聚合物固体电解质进行了深入的研究,其中最成功的是玻璃化温度Tg较低、盐浓度适中的“salt in polymer”固体电解质[2,3],但在没有其它小分... 相似文献
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固态离子导体作为一种高能密度电池中的电解质在传感器中的实际应用受到了普遍关注。聚氧化乙烯与碱金属盐的复合物是其中研究得最早、最多的一类。但它在室温下电导率较低、力学性能不理想,人们正着力于研制综合性能优良的高分子固态离子导 相似文献
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Eli Ruckenstein Xiaonong Chen 《Journal of polymer science. Part A, Polymer chemistry》2000,38(5):818-825
Alkali‐ and alkali‐earth‐metal salts of dicyclopentadiene dicarboxylic acid (DCPDCA) were prepared and employed as crosslinkers for chlorine‐containing polymers such as polychloromethylstyrene (PCMS), chlorinated polypropylene (CPP), polyepichlorohydrin (PECH), and poly(vinyl chloride) (PVC). Thermally reversible covalent crosslinks (i.e., DCPD bridges) between polymer chains were generated through esterification between the chlorine–carbon bonds of the polymer and the carboxylic salt groups of the crosslinker. The crosslinking reactivity decreased in the following sequence: K > Na > LiDCPDCA > alkali‐earth‐metal salts of DCPDCA. In addition, PCMS and CPP had higher gelation rates than PECH and PVC. Good flowability at about 195 °C and solubility in maleimide‐containing dichlorobenzene on heating indicated that the crosslinked PCMS and CPP exhibited thermally reversible crosslinking because of dimer/monomer (cyclopentadiene) conversion of DCPD moieties via reversible Diels–Alder cycloaddition. Samples of PECH and PVC crosslinked by the alkali salts of DCPDCA were insoluble even when heated in maleimide‐containing dichlorobenzene. However, these crosslinked polymers could be dissolved partially after the same treatment when the crosslinker was an alkali‐earth‐metal salt of DCPDCA. Thermal degradation such as dehydrochlorination of the PECH and PVC might have been responsible for uncontrolled crosslinking because these two polymers are known to be thermally unstable. The unreacted COOK, COONa, or COOLi of the crosslinkers might have initiated base‐induced dehydrochlorination when PECH and PVC were heated at high temperatures. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 818–825, 2000 相似文献
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Zhang Kai Liu ShengJian Guan Xing Duan ChunHui Zhang Jie Zhong ChengMei Wang Lei Huang Fei Cao Yong 《中国科学:化学(英文版)》2012,55(5):765-770
A series of alkali metal salts doped pluronic block copolymer F127 were used as electron injection/transport layers (ETLs) for polymer light-emitting diodes with poly[2-(4-(3′,7′-dimethyloctyloxy)-phenyl)-p-phenylenevinylene] (P-PPV) as the emission layer. It was found that the electron transport capability of F127 can be effectively enhanced by doping with alkali metal salts. By using Li2CO3 (15%) doped F127 as ETL, the resulting device exhibited improved performance with a maximum luminous efficiency (LE) of 13.59 cd/A and a maximum brightness of 5529 cd/m2, while the device with undoped F127 as ETL only showed a maximum LE of 8.78 cd/A and a maximum brightness of 2952 cd/m2. The effects of the doping concentration, cations and anions of the alkali metal salts on the performance of the resulting devices were investigated. It was found that most of the alkali metal salt dopants can dramatically enhance the electron transport capability of F127 ETL and the performance of the resulting devices was greatly improved. 相似文献
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Copolymerization of methacrylic acid alkali metal salts (MAAM; M = Li, Na, K, Rb or Cs) and oligo(oxyethylene) methacrylate (MEO) was carried out in bulk or in poly(oligo(oxyethylene) methacrylate) (PMEO) at 60°C. The copolymers of MAAM and MEO which were obtained by bulk polymerization showed a cation conductivity of around 1 × 10?7 S/cm at room temperature. On the other hand, the copolymers obtained by radical polymerization in PMEO, showed a higher cation conductivity (10?6–10?5 S/cm). Furthermore, higher cation conductivity was observed for the copolymer systems containing alkali metal cations with a larger ion radius. This tendency was explained by the strength of the bond between alkali metal cation and ether oxygens. The degree of dissociation had little effect on this difference in the conductivity. The effective dissociation of methacrylic salts was enhanced in the copolymer compared to the homopolymer because of the suppression of the adjacent dissociative carboxylic acid groups. Arrhenius plots for ionic conductivity show the migration of ions along with the segmental motion of the polymer matrix. 相似文献
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K. G. Vassilev D. K. Dimov R. T. Stamenova R. S. Boeva Ch. B. Tsvetanov 《Journal of polymer science. Part A, Polymer chemistry》1986,24(12):3541-3554
Evidence was found of donor–acceptor complexation of molybdenum(VI) compounds by linear and crosslinked PEO. The interaction was studied by optical and NMR spectroscopy and conductivity measurements in organic medium. PEO networks were capable of binding molybdenum salts even in aqueous solution. The character of the interaction is considered to be essentially different from complex formation with alkali metal salts. This is manifested in the relatively low values of the stability constants of complexes with linear PEO. A remarkable effect of crosslinking on the binding capacity of PEO is registered resulting in an increase of complexation constants in chloroform by two orders of magnitude. 相似文献
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[reaction: see text]. Polymer-incarcerated (PI) palladium catalyst was practically prepared from inexpensive Pd(II) salts and a polystyrene-based copolymer under reducing conditions. Remarkable effects of alkali metal salts on the palladium loading were observed. PI Pd thus prepared showed high catalytic activity in Mizoroki-Heck reactions and Suzuki-Miyaura couplings with a range of substrates including an aryl chloride. In all cases, the Pd catalyst was recovered quantitatively without leaching, and reused several times without significant loss of activity. 相似文献
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丙烯酸酯系水乳漆的螯合固化 总被引:1,自引:0,他引:1
本文研究了含螯合单体2-AAEMA的丙烯酸酯共聚物乳漆的窒温螯合交联,用~1H-NMR测定了共聚物中2-AAEMA的含量,IR研究了螯合交联物的结构;比较了五种金属盐(M~(2 ))和不同2-AAEMA含量的共聚物乳液的实际交联效果,并测定了固化产物的交联程度、漆膜耐水性、硬度和力学性能。 相似文献
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Mari Inoki Fumihiko Akutsu Yasuyuki Kitayama Koichi Shinoda Yoshio Kasashima Kiyoshi Naruchi 《Macromolecular rapid communications》1996,17(11):805-811
Thermal reactions of alkali salts of 4-(1-bromoethyl)benzoic acid in bulk were investigated. These reactions were found to produce unexpectedly the graft copolymer, poly(4-vinylbenzoate)-graft-oligo(oxycarbonyl-1,4-phenylenethylidene) ( 1 ). The relative reactivity of the oligocondensation as well as the vinyl polymerization of the salts decreased in the following order: K > Na > Li. The reaction polymerization rate proceeded rapidly during the initial 15 min, and then slowed down. 相似文献
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Summary A
tail-made polymer matrix is proposed to remove strontium ions from aqueous
solutions. The removal behavior of strontium ions on a crosslinked copolymer
containing methacrylic acid as functional groups was investigated as a function
of sorptive concentration, time, temperature and pH. It was observed that an
increase of these parameters enhanced the removal of Sr(II) ions from aqueous
solution. It is found that a maximum adsorption of Sr(II) ions can be obtained
on the crosslinked copolymer after 30 minutes and at pH 8. The increase of
Sr(II) ion concentration in the solution resulted in an increase in the amount
of Sr(II) ions adsorbed on the crosslinked copolymer containing methacrylic
acid as functional groups. However, after a maximum of Sr(II) concentration in
the solution, the percentage of adsorbed Sr(II) ions decreased. The adsorption
data are well represented by the Freundlich, Langmuir and Dubinin-Radushkevich
(D-R) isotherms. The adsorption capacity of the copolymer and the free energy
change were calculated by using the D-R isotherm. For the adsorption of Sr(II)
ions on the crosslinked copolymer the thermodynamic parameters (DH°,DS° andDG°) were
calculated.</p>
</p> 相似文献