聚合物的LB膜

简要介绍了聚合物LB(Langmuir -Blodgett)膜的制备装置和制备过程。同时对聚合物LB膜这一门学科最新的进展和应用前景做了较为详尽的介绍和论述。目前 ,随着对LB膜的研究深入 ,在对小分子LB膜、可聚合LB膜、聚合物LB膜的成膜研究中引入了将几种方法优点综合起来的新的成膜方法 ,并已成为研究热点     

聚合物Langmuir—Blodgett膜研究进展

聚合物LB膜可用两种方法制备,一种是两亲单体成膜再进行聚合反应,另一种为直接从两亲聚合物在亚相表面铺展成膜并转移。本文综合聚合物LB膜的研究状况,包括两亲聚合物和非两亲聚合物,对聚合物LB膜的成膜特点,结构和性能作了描述,并简要介绍了聚合物LB膜的应用前景。     

超分子构筑调控合成结构规整的梯形聚合物及其应用研究

综述了"超分子构筑调控的逐步偶联/聚合法",该方法将高分子化学与超分子化学相结合,利用多种类型的超分子弱键协同作用首先构筑预期的梯形超分子结构,再经聚合得到共价键梯形高分子.利用该方法合成了一系列结构规整的氧桥基和有机桥基梯形聚硅氧烷以及碳基梯形聚酯,并利用侧基间π-π叠加作用实现了对聚合物立体构型控制.扼要介绍了梯形聚合物在先进材料方面的应用,例如梯形聚硅氧烷液晶光致取向膜;由梯形聚硅氧烷合成的管状聚硅氧烷在高室温储存期微电子环氧塑封料方面的应用;以及基于梯形聚硅氧烷的拟筛板聚合物在二阶非线性光学材料方面的应用等.     

可交联LB膜的研究(Ⅰ)聚-L-谷氨酸-5-(6＇-己二醇肉桂酸酯)酯的合成、表面行为、光交联反应的研究

合成了一种新的聚合物聚L-谷氨酸-5-(6＇-己二醇肉桂酸酯基)酯,研究了它在空气/水界面的行为、形成LB膜能力、液晶性质及光交联反应.     

可交联LB膜的研究(I)聚-L-谷氨酸-5-(6-己二醇肉桂酸酯)酯的合成、表面行为、光交联反应的研究

合成了一种新的聚合物聚 L-谷氨酸 - 5- ( 6 -己二醇肉桂酸酯基 )酯 ,研究了它在空气 /水界面的行为、形成 LB膜能力、液晶性质及光交联反应。     

偶氮苯和氧化偶氮苯液晶基元侧链聚硅氧烷液晶的合成和性能研究

利用侧链带酰氯基的聚硅氧烷与取代偶氮苯酚进行大分子反应,合成了6种以偶氮苯氧羰基为侧链的聚硅氧烷Ⅲ_a-f;将其中的Ⅲ_a-c进行氧化,得到3种以氧化偶氮苯氧羰基为侧链的聚硅氧烷Ⅳ_a-c聚合物结构通过核磁共振、红外光谱和元素分析表征,利用偏光显微镜和差热分析仪研究了聚合物的相行为.讨论了苯环上取代基和液晶基元的中心桥键对聚合物液晶性能的影响.     

聚合物LB膜定向铁电液晶的特性

利用新近合成的聚酰亚胺LB膜定向铁电液晶分子,通过原子力显微镜对经不同亚胺化温度处理的聚酰亚胺LB膜进行扫描探测,发现相应的LB膜具有不同的形貌结构,认为高温亚胺化的LB膜可以提供较高的势垒,这为铁电液晶双稳记忆性的出现提供了可能,而LB膜的超薄特性有利于开关过程中表面聚积电荷的中和与释放,保证了器件优良的双稳记忆性的最终获得以及微秒量级快速响应的实现。     

显示颜色的液晶聚合物

以色列和西德化学家已制备了依靠光和温度显示红、黄、蓝(三原色)的液晶聚合物[Angew.Chem.,Int.Ed.Engl.26,1178(1987)],这些材料是含有螺吡喃基的聚硅氧烷,将聚合物膜用可见光照射使它们呈现淡黄色。紫外光照射使淡黄的膜转变成深红色(假使照射是在-20℃下实行则呈蓝色)。     

高分子LB膜

概述了高分子Langmuir-Blogett膜,并依其成膜方式分别介绍了可聚合LB膜、聚合物的LB膜及其它几种LB膜。     

聚合物分散液晶膜

聚合物分散液晶膜是将液晶和聚合物结合,得到的一种综合性能优异的膜材料,液晶分子赋予了聚合物分散液晶膜显著的电光特性,使其受到了广泛的研究,并有着广阔的应用前景。而聚合物作为成膜材料,起着辅助但是重要的作用,其结构和固化过程是影响聚合物分散液晶膜电光特性的重要因素。本文简要综述了聚合物分散液晶膜的制备方法、电光特性的影响因素及研究手段。     

Polymer-surfactant layered heterostructures by electropolymerization of phenosafranine in Langmuir-Blodgett films

Langmuir-Blodgett (LB) films of the water-soluble dye phenosafranine (PS) have been prepared by its adsorption from aqueous dye solution to an arachidic acid (AA) monolayer at the air-water interface. Atomic force microscopy (AFM) images of the LB films revealed the effect of change in pH of deposition on the degree of complexation of AA with the PS dye. Well-defined circular islands and holes were observed which disappeared with the increase in pH. Polarized absorption studies indicated that the dye molecules are oriented uniaxially with their long axis titled at a constant angle to the surface normal of the LB film. Within the restricted geometry of the LB film, the PS dye was electropolymerized to form a two-dimensional film of poly(phenosafranine) sandwiched between arachidic acid layers. The film was characterized by IR spectroscopy, cyclic voltammetry, and AFM. X-ray diffraction studies reveal the presence of a layer structure in the AA-PS LB film before and after polymerization. The polymer film showed highly anisotropic electrical conductivity of ca. 10 orders of magnitude. This indicates the formation of two-dimensional polyPS layers between arachidic acid layers resulting in a layered heterostructure film having alternate conducting and insulating regions. Also, the conductivity of the polyPS prepared from LB film was found to be approximately 2.5 times higher than the conductivity of polyPS prepared by solution polymerization method.     

四硫代富瓦烯及其CT复合物导电LB膜

通过Langmuir-Blodgett（LB）技术制备导电性有机超薄膜近年来受到了广泛的关注，导电LB膜的膜材料主要是含有电子受体77’，8，8’一四氨基二亚甲基本自（TCN则的电行转移（CT）复合物间以及给体分子特别是四流代宫瓦烯衍生物［‘刮.在以前的工作中，我们曾报导了四等基硫四硫     

一种新的共轭桥联双二茂铁衍生物的单层LB膜及其电催化效应

合成并表征了一种新的非两亲性共轭桥联双二茂铁衍生物，该化合物在空气／水界面上易形成较稳定的单分子膜，与花生酸形成的混合膜易组装成ＬＢ膜，紫外－可见吸收光谱表明：ＬＢ上膜分子中发生了聚集，扫描电镜观察了混合单层ＬＢ膜的表面形貌及膜的相分离。循环伏安研究表明：混合单层ＬＢ膜修饰电极对Ｆｅ（ＣＮ）／Ｆｅ（ＣＮ）离子对的电化学反应具有良好的电催化效应，对抗坏血酸电化学氧化具有明显的促进作用。     

稀土Eu(Ⅲ)双酞菁衍生物LB膜的荧光性

合成了八－４－（四氢糠氧基）酞菁铕（Ⅲ）,通过元素分析、红外光谱、质谱和紫外－可见光谱加以确认。测定了配合物的ＩＩ－Ａ曲线,证明它有很好的成膜性,Ｚ型沉积形成的ＬＢ膜材料有很强的荧光响应,随着ＬＢ膜厚度的增加,荧光性增强。掺杂邻菲咯啉形成的混合ＬＢ膜,其荧光性比纯膜强。但不是邻菲咯啉加入的量越多荧光性越强。配合物：邻菲咯啉＝１：１０时（摩尔比）,有最好的荧光行为。用电子光谱对ＬＢ膜的结构进行了表征     

Alkyl-chain branched effect on the aggregation and photophysical behavior of polydiarylfluorenes toward stable deep-blue electroluminescence and efficient amplified spontaneous emission

The control of the condensed superstructure of light-emitting conjugated polymers(LCPs) is a crucial factor to obtain high performance and stable organic optoelectronic devices.Side-chain engineering strategy is an effective platform to tune inter chain aggregation and photophysical behaviour of LCPs.Herein,we systematically investigated the alkyl-chain branched effecton the conformational transition and photophysical behaviour of polydiarylfluorenes toward efficient blue optoelectronic devices.The branched side chain will improve materials solubility to inhibit interchain aggregation in solution according to DLS and optical analysis,which is useful to obtain high quality film.Therefore,our branched PEODPF,POYDPF pristine film present high luminance efficiency of 36.1% and 39.6%,enhanced about 20%relative to that of PODPF.Compared to the liner-type sides' chain,these branched chains also suppress chain planarization and improve film morphological stability effectively.Interestingly,the branched polymer also had excellent stable amplified spontaneous emission(ASE) behaviour with low threshold(4.72 μJ/cm~2) and a center peak of 465 nm,even thermal annealing at 220 C in the air atmosphere.Therefore,side-chain branched strategy for LCPs is an effective means to control interchain aggregation,film morphology and photophysical property of LCPs.     

Alkyl-chain branched effect on the aggregation and photophysical behavior of polydiarylfluorenes toward stable deep-blue electroluminescence and efficient amplified spontaneous emission

Robust branched polydiarylfluorenes are constructed forstable deep-blue electroluminescence and efficient amplified spontaneous emission.     

5,10,15,20-四-(4-N,N,N-二甲基十六烷基氨基苯基)卟啉LB膜结构的研究

研究了两亲性卟啉5,10,15,20-四-(4-N,N,N-二甲基十六烷基氨基苯基)卟啉(TDMC₁₆PP)在气/液界面上的成膜性能,制备了其多层LB膜。用UV-Vis吸收光谱、荧光光谱、偏振UV-Vis吸收光谱和小角X射线衍射对LB膜进行了测试表征。结果表明:两亲性卟啉TDMC₁₆PP具有良好的成膜性能,其LB膜性质稳定,有较好的结构均匀性和周期性。在LB膜内,脂肪链并不是直立的,卟啉大环平面与基片平面成42.5°排列。     

具有长侧链结构苯醌类化合物的合成及其成膜性质研究

应用经过改进的自由基烷基化新方法,合成了一系列的具有长侧链结构的苯醌类化合物。研究了这类化合物形成LB膜的性能和规律。讨论了醌类化合物的成膜性能与生物活性之间的关系。     

具有长侧链结构苯醌类化合物的合成及其成膜性质研究

应用经过改进的自由基烷基化新方法，合成了一系列的具有长侧链结构的苯醌类化合物。研究了这类化合物形成LB膜的性能和规律。讨论了醌类化合物的成膜性能与生物活性之间的关系。     

Langmuir-Blodgett films of polymethacrylates with side chains containing functionalized aromatic schiff's bases

Langmuir-Blodgett (LB) film formation has been investigated for polymers in which non-linear optical (NLO) moieties are attached to the side chain of a polymethacrylate (PMA) backbone. Polymer monolayers were successfully transferred onto hydrophilic glass substrates using a moving-wall type LB trough. The LB films were characterized by pressure-area isotherms, polarized ultraviolet visible spectra, ellipsometry, and second harmonic generation measurements. The characterization shows that NLO moieties in the side chain are inclined at a shallow angle to the plane of the substrate. The second-order nonlinear optical coefficient and molecular hyperpolarizability were also calculated. © 1993 John Wiley & Sons, Inc.