基于5-(2-羧基苯基)吡啶-3-甲酸配体的镍(Ⅱ)和锌(Ⅱ)配位聚合物的合成、晶体结构、催化及抗磨性质

采用水热方法,选用5-(2-羧基苯基)吡啶-3-甲酸配体(H₂cpna)与1,2-二(4-吡啶基)乙烷(dpea)或1,2-二(4-吡啶基)乙烯(dpey)分别与NiCl₂·6H₂O和ZnCl₂在160℃下反应,合成了2个三维配位聚合物{[Ni(μ₃-cpna)(μ-dpea)_0.5]·H₂O}_n (1)和{[Zn(μ₃-cpna)(μ-dpey)_0.5]·H₂O}_n (2),并对其结构、催化和摩擦性质进行了研究。研究表明,在室温条件下化合物2在Knoevenagel缩合反应中显示出较好的催化活性。同时,2在聚α-烯烃合成润滑剂中显示出有效的抗磨性能。     

基于5-(4-(2,6-二(2-吡嗪基)-4-吡啶基)苯氧基)间苯二甲酸的Mn(Ⅱ)和Ca(Ⅱ)配位聚合物的合成与晶体结构

采用对苯二甲酸为模板剂, 溶剂热法合成了2个以5-(4-(2, 6-二(2-吡嗪基)-4-吡啶基)苯氧基)间苯二甲酸(H₂L)为配体的金属-有机配位聚合物:{[MnL] ·0.5H₂O}_n (1), {[CaL(H₂O)₂]·H₂O}_n (2)。通过X-射线单晶衍射, 元素分析和红外光谱进行了结构表征。结构分析表明, 1具有(3, 3)-连接的不同手性型二维层面结构, 这些交替出现的单手性左旋型和右旋型二维平面通过配体的吡啶环与吡嗪环间π…π堆积作用构成了三维超分子结构;2是通过L^2-配体羧基桥连接相邻的Ca(Ⅱ)金属中心, 形成一条平行于b轴方向的一维链结构。研究了配位聚合物的热稳定性和2的荧光性质。     

季铵盐改性氧化石墨烯的制备及其性能研究

本论文采用改进的Hummers法制备了氧化石墨烯(GO),并将氧化石墨烯用十二烷基二甲基苄基氯化铵(1227)进行修饰,得到1227非共价改性的氧化石墨烯(GO-1227)。用拉曼光谱、漫反射红外光谱分析、X-射线光电子表面能谱技术表征了其化学结构;用X-射线衍射分析、扫描电子显微镜与透射电子显微镜观察了其剥离情况和微观形貌;分析了它们在不同溶剂中的分散性。结果表明,季铵盐改性后,1227阳离子通过静电作用插入到GO片层之间,使GO片层进一步剥离,且在极性较弱的有机溶剂中的溶解性增加。热失重分析表明,GO-1227的初始分解温度提高了约70℃。将GO-1227与聚甲基丙烯酸甲酯与苯乙烯的嵌段共聚物(PMMA-b-PS)凝胶聚电解质复合,制备了纳米复合凝胶聚合物电解质(NGPE),并用交流阻抗法测试其电性能,发现占聚电解质总质量2‰的GO-1227可以将其离子电导率提高8.6倍。     

Improved Photovoltaic Performance of MEH-PPV/PCBM Solar Cells via Incorporation of Si Nanocrystals

We have studied the effect of silicon nanocrystals （SiNCs） as a third component on performance of organic bulk heterojunction solar cells composed of poly[2-methoxy,5-（2＇-ethylhexyloxy）-l,4-phenylene vinylene] （MEH- PPV）：[6,6]-phenyI-C61-butyric acid methyl ester （PCBM） blend film. By adding suitable amounts of SiNCs into MEH-PPV：PCBM blend, the device performance such as external quantum efficiency, short circuit current density （Js（）, and power conversion efficiency （PCE） improved. Incorporation of 2.5% SiNCs in the blend led to 13.6% improvement of Jsc, which in turn resulted in 18% improvement of PCE up to 2.28%. The improved performance was mainly due to the improvements both in the charge generation from the interface of MEH-PPV/SiNCs and the charge collection at the cathode.     

一种交联聚合物薄膜的表面引发聚合制备及其摩擦磨损性能

采用活性可控的表面引发原子转移自由基聚合方法,在硅片表面制备了聚3-(三甲氧基硅)丙基甲基丙烯酸酯聚合物刷,其中产物侧链的三甲氧基硅基团提供相邻分子间相互交联的位点而形成聚合物薄膜;采用衰减全反射红外光谱仪和原子力显微镜分析了薄膜的化学结构和微观形貌,利用椭圆偏光测厚仪和接触角测量仪测定了其厚度和水接触角,并利用微观和宏观摩擦磨损测试装置评价了薄膜的摩擦磨损性能.结果表明,所制备的薄膜具有聚合物的结构特征以及良好的减摩抗磨特性,且其抗磨能力随着厚度增加而增强.     

染料木素分子印迹聚合物的制备及其识别性能

以染料木素为模板分子、4-乙烯基吡啶(4-VP)为功能单体、乙二醇二甲基双丙烯酸酯(EGDMA)为交联剂、四氢呋喃(THF)为溶剂,采用本体聚合法制备了染料木素的分子印迹聚合物;采用静态平衡结合实验研究了该分子印迹聚合物对染料木素的结合能力和选择性能.结果表明,与化学组成相同的相应非印迹聚合物相比,染料木素分子印迹聚合物对染料木素的吸附性能和选择性更好.利用所合成的分子印迹聚合物作为固相萃取材料填充固相萃取小柱,可以选择性地从豆奶粉中分离、富集染料木素;此外,该分子印迹聚合物还有望用于其他豆制品的分析检验.     

二苯磷酰基取代四苯基硅的合成及在构筑宽禁带聚合物中的应用

设计并合成了二苯磷酰基取代的四苯基硅基团,并将其作为宽禁带聚合物母体材料构筑基元,通过Suzuki反应偶连3,6位取代的咔唑合成了聚合物SiCzP.对聚合物的结构进行了系统的表征.与模型聚合物SiCz相比,二苯磷酰基的强吸电子能力,降低聚合物母体材料的LUMO能级,更有利于电子的注入.SiCzP与SiCz的玻璃化转变温度分别为219与227℃,失重5%时的分解温度分别为441与426℃.二者均具有良好的成膜性,掺杂器件初步结果表明,二苯磷酰基的引入使器件的亮度和效率都得到提高,其最大流明效率和功率效率比SiCz分别提高了98%和75%.     

Deposition Strategies for Osmium/Enzyme Films on Gold Electrode Based Sensing Arrays

Multi‐analyte real‐time interrogation of cellular activity allows for the potential discovery of novel insights into disease. In this report, the addition of electrochemical biosensors to a previously developed platform utilizing Au microfabricated electrodes was explored. Glucose oxidase was immobilized at the electrode surface with an osmium redox polymer, using hand‐casting and electrodeposition techniques, allowing for the first comparison of deposition techniques at a Au microfabricated array. This preliminary work is the first step toward the goal of creating a multi‐analyte array for cellular analysis.     

Real-Time Monitoring of the Mechanical Properties of a Soy Protein and Rubber Polymer during its Production Using Transient Infrared Spectroscopy

Soy protein–based polymers offer promising performance properties, but their characteristics are sensitively dependent on production conditions, so on-line monitoring could help provide the needed control during production. Mid-infrared spectroscopy combined with partial least squares offer the needed analysis, but the opacity of many materials in the mid-infrared range limits its conventional application. Transient infrared spectroscopy is a method of acquiring mid-infrared spectra from moving streams in real time that avoids the opacity problem. We apply transient infrared spectroscopy to a polymer of soy protein and polyisoprene-graft-maleic anhydride–modified natural rubber during its compounding extrusion to measure tensile strength and Young's modulus.     

Helical Biphenyl Bisazo Polyurethane: Preparation,Characterization and Analysis of Polymeric Thermo-Optic Switch

The bisazo chromophore molecule (CAAPM) and helical biphenyl bisazo polyurethane (HBBPU) were synthesized. The structures of CAAPM and HBBPU were characterized by FT-IR and UV-vis spectroscopic techniques. The measurements of refractive index and thermo-optic coefficient (dn/dT) of HBBPU were demonstrated at different wavelengths and different temperatures by the ATR technique. By using CCD digital imaging devices, transmission loss of the internal waveguide was measured. The refractive index dispersions and Sellmeyer coefficients of HBBPU were obtained by the Sellmeyer equation. A Y-branched switch based on the thermo-optic effect was proposed and the performance of the switch was simulated. With a branching angle of 0.143° and the FD-BPM method, the result showed that the power consumption of the thermo-optic switch could be only 3.6 mW, and the response time of the switch could reach about 8 ms. This is a significant improvement in reducing power consumption compared with the normal Y-branched polymer thermo-optic switch.