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1.
研究了聚环氧乙烷(PEO)/聚2-乙烯基吡啶(P2VP)的共混物分别经LiCLO4、四氰基代苯醌二甲烷(TCNQ)及两者共同掺杂后其共混物的离子、电子及混合导电率,当PEO与P2VP的重量比分别为6/4、5/5及4/6时,共混物的混合导电率大于相应的离子及电子导电率的总和,呈现协同效应,从共混物外观的研究发现LiCLO4能作为PEO/P2VP共混体系的增容剂。 相似文献
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用原子转移自由基聚合(ATRP)法合成了结构可控的三嵌段共聚物聚(4-乙烯基吡啶)-b-聚环氧乙烷-b-聚(4-乙烯基吡啶)(P4VP-b-PEO-b-P4VP).用核磁共振氢谱和凝胶渗透色谱对该共聚物进行了表征;将该共聚物作为毛细管物理吸附涂层,用毛细管电泳对碱性混合蛋白质进行了分离.结果表明:蛋白质的分离效率随着P... 相似文献
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采用粘度法确定了聚4-乙烯基吡啶(P4VP)在乙醇/水混合溶剂中的临界交迭浓度c*, 分别在稀溶液与亚浓溶液浓度范围内, 采用光谱法与电导滴定法研究了P4VP与Cu(II)离子的配合过程及配合物的结构, 通过红外光谱(FTIR)对配合物的化学结构进行了表征, 并用差示扫描量热法(DSC)测定了配合物的热性能. 结果表明, 对于相对分子质量为1.06×105的P4VP, 其c*为15 mmol8226;L8722;1(按P4VP中的链节量计算). 在稀溶液中P4VP与Cu(II)离子形成可溶性的分子内配合物, 表观配位数为9~10;在亚浓溶液中, P4VP与Cu(II)离子发生分子间配合作用, 由于配位交联, 形成不溶性的配合物P4VP-Cu(II), 配位数为3. P4VP与Cu(II)离子形成配合物后, 玻璃化温度明显提高. 相似文献
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研究了聚(苯乙烯-丙烯酸)(PSAA)负载-氯化钕(NdCl3)配合物催化苯乙烯与4-乙烯基吡啶共聚活性。考察了Al/Nd摩尔比、聚合时间以及苯乙烯与4-乙烯基吡啶比(g.g-1)对苯乙烯与4-乙烯基吡啶共聚的影响。结果表明:这种极性单体与烯烃的共聚反应能有效发生,聚合物负载氯化钕配合物的催化性能高于同类小分子稀土氯化物,配合物催化活性随着Al/Nd摩尔比的增加而增加,随聚合时间的延长而降低,反应时间为2 h时配合物催化活性最高;4VPy和St摩尔比为4∶2时产率较高;得到的聚合物具有良好的耐热性。 相似文献
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聚-2-氨基吡啶电化学合成及性质 总被引:2,自引:0,他引:2
报导了在 0.43 mol•dm-3 C6H6N2和0.01 mol•dm-3 NaOH中用循环伏安法合成聚-2-氨基吡啶. 聚-2-氨基吡啶在1.0 mol•dm-3 ZnCl2(pH=4.99)溶液中的循环伏安图上有三对氧化-还原峰.旋转环-盘实验的结果表明,在 2-氨基吡啶聚合的初期有中间体生成.由红外光谱可知,聚-2-氨基吡啶具有头-尾相接的结构.聚-2-氨基吡啶平均粒子大小约893 nm, 平均粒子间距约 255 nm. 由聚-2-氨基吡啶正极和锌负极及2.5 mol•dm-3 ZnCl2溶液和 3.0 mol•dm-3 NH4Cl (pH=5.5) 溶液构成的电池,其放电曲线类似于Li-SOCl2, 放电曲线的中间区域非常平稳. 相似文献
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Ionic, electronic and mixed (ionic-electronic) conductivities of blends of poly(2-vinylpyridine) (P2VP) and poly(ethylene oxide) (PEO) with high molecular weight after dopedwith LiClO_4, TCNQ or LiClO_4 and TCNQ were investigated. Effects of LiClO_4 and TCNQconcentrations on the conductivity of PEO/P2VP/LiClO_4 or TCNQ blend were studied.The ionic conductivity of PEO/P2VP/LiClO_4 blend increases with increasing PEO content.At a Li/ethylene oxide molar ratio of 0.10 and a TCNQ/2-vinyl pyridine molar ratio of 0.5,the mixed conductivity of PEO / P2VP / LiClO_4 / TCNQ is higher than the total of ionicconductivity of PEO/P2VP/LiClO_4 and electronic conductivity of PEO/P2VP/TCNQwhen the weight ratio of PEO and P2VP is 6/4 or 5/5. Scanning electron microscopy(SEM) on the broken cross-section of the PEO/P2VP/LiClO_4 blend and differential scan-ning calorimetry (DSC) results show that LiClO_4 could act as a compatibilizer in the blend. 相似文献
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Glass transitions were observed in thin films of poly(2-vinyl pyridine) (P2VP) and poly(methyl methacrylate) (PMMA) using a scanning nanocalorimetry technique which has both high sensitivity (10−9 J/K) and high scan rates (104-105 K/s). Samples were deposited by the spin-cast method. The thickness of samples was 100-400 nm. Glass transition temperature, obtained by nanocalorimetry, is shifted toward higher temperatures by 10-20 K and activation enthalpy of glass transition is shifted to lower values by factor of 2-4. The glass transition characteristics of both polymers are discussed in terms of the standard Tool-Narayanaswamy-Moynihan (TNM) multi-parameter model. 相似文献
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Naoko Yasumoto Naoko Kasahara Ayumi Sakaki Mitsuru Satoh 《Colloid and polymer science》2006,284(8):900-908
Swelling degrees of partially quaternized poly(4-vinyl pyridine) (p.q.P4VP) were measured as functions of the degree of quaternization (D.Q.: 5, 10, 15, 30, and 50 mol%), salt concentration (0–4 M), and salt species (KF, LiCl, NaCl, KCl, CsCl, MgCl2, KBr, LiSCN, KSCN, Na2SO4, and MgSO4) to study ion effects on the three kinds of interactions involved with p.q.P4VP in aqueous systems, i.e., electrostatic interaction, hydrogen bonding to the nitrogen of the pyridine ring, and hydrophobic interaction, as well as to estimate the relative contributions of the respective ion effects to gel swelling. Upon addition of salts at the lowest salt concentration studied (0.01 M), p.q.P4VP gels, except for one with D.Q.=10%, significantly deswelled depending on the counterion species; the lowest swelling degree was observed for the thiocyanates and the highest one for KF. In the higher salt concentration region (≧1 M) where electrostatic interactions might well be screened, however, some salt systems (e.g., LiCl, KSCN) showed swelling with increased salt concentration, contrary to the common behavior of usual ionic gels. These ion-specific swelling behaviors were interpreted as being caused by additive ionic effects on the three kinds of interactions. 相似文献
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Poly(4-vinyl pyridine) is used as a polymeric ligand to react with metal alkyls, MenM (n = 3, M = Al, Ga or In; n = 2, M = Cd or Zn) to form adducts. The adducts are characterized by solid state 13C NMR, infrared spectroscopy, microanalyses and differential scanning calorimetry (DSC). All the adducts are nonpyrophoric and thermally dissociable, so they may have potential both for use in adduct purification processes or for use as safer metal alkyl sources for Metal–Organic Chemical Vapor Deposition. 相似文献
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Styrene was polymerized in the presence of benzoyl peroxide (BPO) and 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) to yield polystyrene-TEMPO (PS-TEMPO) macroinitiator. The PS-TEMPO macroinitiator with different molecular weight was reacted with 4-vinyl pyridine (4-VP) to synthesize polystyrene-block-poly(4-vinyl pyridine) (PS-b-PVP), which was then quaternized with n-octyl iodide. Antibacterial activity of the quaternized copolymers was assessed against a gram negative bacterium (Pseudomonas aeruginosa) and a gram positive one (Staphylococcus aureus) by using the shake flask test method, and the results were compared with those of poly(styrene-random-4-vinyl pyridine) (P(ST-r--VP)). The quaternized copolymers inhibited greatly the growth of the bacteria, and PS-b-PVP was more active than P(ST-r-VP), which was ascribed to the fact that the content of quaternized 4-VP units on the surface of the particles of the former copolymer was higher than that corresponding to the latter one. 相似文献
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《高分子科学杂志,A辑:纯化学与应用化学》2013,50(6):585-591
Quaternization of poly(4-vinyl pyridine), (P4-VP) by common alkyl halides can be performed with relatively low (up to 65–70%) conversion yields. Here we describe fully quaternization of P(4-VP) with activated halides such as chloro 2-propanone and 2-chloroacetamide in dimethylformamide (DMF) at room temperature. 相似文献
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Kinetic hydrate inhibitor performance of new copolymer poly(N-vinyl-2-pyrrolidone-co-2-vinyl pyridine)s with TBAB 总被引:1,自引:0,他引:1
In oil and gas field, the application of kinetic hydrate inhibitors (KHIs) independently has remained problematic in high subcooling and high water-cut situation. One feasible method to resolve this problem is the combined use of KHIs and some synergists, which would enhance KHIs’ inhibitory effect on both hydrate nucleation and hydrate crystal growth. In this study, a novel kind of KHI copolymer poly(N-vinyl-2-pyrrolidone-co-2-vinyl pyridine)s (HGs) is used in conjunction with TBAB to show its high performance on hydrate inhibition. The performance of HGs with different monomer ratios in structure II tetrahydrofuran (THF) hydrate is investigated using kinetic hydrate inhibitor evaluation apparatus by step-cooling method and isothermal cooling method. With the combined gas hydrate inhibitor at the concentration of 1.0 wt%, the induction time of 19 wt% THF solution could be prolonged to 8.5 h at a high subcooling of 6℃. Finally, the mechanism of HGs inhibiting the formation of gas hydrate is proposed. 相似文献
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Noor Hidaya Abdul Nasir Chin Han Chan Hans-Werner Kammer Lai Har Sim Muhd Zu Azahan Yahya 《Macromolecular Symposia》2010,290(1):46-55
Summary: Solution casting technique served to prepare solid solutions of lithium perchlorate and poly(ethylene oxide) (PEO) having different molecular masses. Salt concentrations of solutions were varied between around 2 and 13 wt%. Crystallinity and melting point depression served to determine composition and content of amorphous phase as well as thermodynamic behavior of the solutions. Conductivity as a function of salt concentration in the amorphous phase follows a power law at constant temperature (30 °C). It results that both exponent and mobility of charge carriers increase with ascending molecular mass of PEO. The mobility follows an increase with molecular mass proportional to M2.8 indicating dependence of mobility on interstitial volume between chain molecules. Deviation of solution from perfect behavior can be evaluated by melting point depression. Accordingly, increase in conductivity is preferably related to approach to perfect solution behavior. Determination of dielectric function allows some conclusion about ion pair formation in the systems under discussion. It turns out that probability of ion pair formation decreases with increasing molecular mass of PEO in agreement with thermodynamic behavior of the solutions. 相似文献
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聚丙炔醇(POHP)经碘、硫酸、三氯化铁、盐酸掺杂,其电导率可提高六个数量级,硫酸、三氯化铁、盐酸掺杂POHP都显示良好的稳定性。通过红外光谱、光电子能谱、顺磁共振的研究。对掺杂POHP的电荷转移过程及可能存在的栽流子进行了研究。 相似文献
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Yuan Zhong MA 《中国化学快报》1998,(11)
Enzylnebasedampcr()metricbiosensorsha\'eattractedincreasinginterestinthe1astt`xodecades.Inordertofabricate[heenzyn1elayer,considerahlceff()rtsha\,eheendcv()tcdt(1thedeveloprnent()fvari()ustechniquesf()rin1n1obilizingthcen/yn1c"2.Rcccntly.thcp()lyelectrolyte-proteincomplcx111ultilayerassen1blybyaIternateelectr()staticadsorptionhasbcenrep()rted',amullilaycrc()nsistingofalterl1atepolyethylenimineandglucoseoxidasclaycrswasassemb1edhyLv()veltl/>.ThesebioIllo1eculararthitecturesopenawaytoconstruct… 相似文献