Photocurable and Thermosetting Polymer Materials on the Basis of Benzocyclobutene and Its Derivatives for Electronics

Russian Journal of General Chemistry - One of the promising directions, which have already been applied in many technological processes in manufacturing electronic components and devices, is the...     

Polymeric Derivatives of Chloramphenicol and Their Antibacterial Properties

The polymerizable derivatives of chloramphenicol were prepared and free-radical copolymerized with acrylamide, methacrylic acid, and 2-(dimethylamino)ethyl methacrylate in order to obtain polymers with pharmacological activity. The monomeric and polymeric derivatives were subjected to antibacterial activity tests against Bacillus polymyxa.     

基于卟啉衍生物红光材料的合成及物性研究

利用Schiff base反应合成了两个卟啉衍生物TPP-AQ, TPP-PD. 通过循环伏安、紫外可见吸收光谱、荧光光谱及理论计算等对其物性进行了研究. 结果显示: TPP-AQ, TPP-PD氧化电位分别为E_1/2＝1.07, 1.30 V和1.21, 1.36 V, 与TPP-PD相比, TPP-AQ的两个氧化还原电位都发生了负移|TPP-AQ与TPP-PD的最大紫外可见吸收峰分别在441和431 nm, TPP-AQ的吸收波长较TPP-PD有一定程度的红移, 通过理论计算可知这是由于TPP-AQ共轭程度优于TPP-PD导致的. TPP-AQ和TPP-PD的荧光主发射峰分别在657和656 nm, 半峰宽分别为30和27 nm, 有较好的红光色纯度.     

Synthesis,Fluorescence and Dielectric Properties of Two Novel Compounds Based on Triethylenediamine Derivatives

Two compounds C_8H_(18)N_2Br_3Mn_(0.5)(1) and C_(12)H_(26)N_2Cl_4Mn(2) based on triethylenediamine derivatives were synthesized by solution method and were characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray structure analysis, fluorescence test, circular dichroism(CD) analysis and dielectric measurement, respectively. According to single-crystal X-ray determination, compound 1 crystallizes in the cubic system, space group Pa3 with a = b = c = 13.7246(5) ?, Z = 24, V = 2585.2(3) ?~3; and compound 2 crystallizes in the orthorhombic system, space group P212121 with a = 7.9716(13), b = 15.309(3), c = 15.804(3) ?, Z = 4 and V = 1928.7(6) ?3. Fluorescent analysis of compound 1 showed an intense emission band at 670 nm when the exciting radiation was set at 378 nm and fluorescent analysis of compound 2 showed an intense emission band at 515 nm when the exciting radiation was set at 363 nm. Dielectric constants of compounds 1 and 2 were measured at different frequencies with temperature variation.     

Effect of Aging on the Mechanical Properties of Polymeric Materials

Abstract

Aging can modify polymer structure at the molecular, macromolecular, and/or the morphological level and thus induce changes in the mechanical properties. Stiffness is generally not modified for nonrubbery materials, except for mass transfer (solvent plasticization or plasticizer loss) in amorphous polymers or phase transfer (crystallization or crystal destruction) in semicrystalline polymers. The most significant modulus changes occur in the radiochemical aging of semicrystalline polymers whose amorphous phase is in the rubbery state. Yield properties generally vary in the same way as stiffness. Physical aging at T < T _g can lead to a significant increase in the yield stress. Very general features can be observed for rupture properties, for instance: 1) Only ultimate elongation ε is a pertinent variable in kinetic studies of aging involving tensile testing and related methods, 2) the amplitude of ε variation for a given degradation conversion is considerably higher for initially ductile materials than for brittle ones, and 3) the rupture envelope σ = f(ε), i.e., the ultimate stress, is often very close to the initial tensile curve except for rubbery materials undergoing predominant crosslinking. The mechanisms of ultimate property changes are reviewed. A kinetic approach is proposed for the very important case of heterogeneous, diffusion-controlled aging.     

Electret and Strength Properties of Polymeric Materials Based on Epoxy Oligomer and Amine Curing Agents

Russian Journal of Applied Chemistry - Electret properties of polymeric materials based on DER-331 epoxy oligomer and amine curing agents, produced in the course of synthesis of the polymer in a...     

Composite Polymeric Materials Based on Polyisocyanurates and Polyurethanes

Network poly(urethane-isocyanurate) systems were synthesized from polyurethanes and polyisocyanurates, and the process for preparing composite materials based on them was examined.     

Switchable Dielectric Materials Based on 2-Methylimidazole

Two novel coordination polymers with molecular structures(2MI)~+[Zn(2MI)Cl_3]~-(1) and(2MI)~+NO_3~-(2) based on ligand 2-methylimidazole(2MI) were synthesized under solution method. Compound 1 crystallizes in the monoclinic system, space group Cc with a=7.489(2), b=13.448(4), c=13.983(4) ?, β=98.402(2)°, Z=4 and V=102.246(2) ?~3. Compound 2 crystallizes in the orthorhombic system, space group pnma with a=14.296(3), b=6.3180(12), c=7.3862(13) ?, β=90°, Z=4 and V=667.1(2) ?~3. Dielectric measurements show compounds 1 and 2 have reversible dielectric anomalous behaviors with variation frequencies at different temperature.     

Polymeric Emissive Materials Based on Dynamic Covalent Bonds

Dynamic covalent polymers, composed of dynamic covalent bonds (DCBs), have received increasing attention in the last decade due to their adaptive and reversible nature compared with common covalent linked polymers. Incorporating the DCBs into the polymeric material endows it with advanced performance including self-healing, shape memory property, and so forth. However, the emissive ability of such dynamic covalent polymeric materials has been rarely reviewed. Herein, this review has summarized DCBs-based emissive polymeric materials which are classified according to the different types of DCBs, including imine bond, acylhydrazone bond, boronic ester bond, dynamic C-C bond, as well as the reversible bonds based on Diels–Alder reaction and transesterification. The mechanism of chemical reactions and various stimuli-responsive behaviors of DCBs are introduced, followed by typical emissive polymers resulting from these DCBs. By taking advantage of the reversible nature of DCBs under chemical/physical stimuli, the constructed emissive polymeric materials show controllable and switchable emission. Finally, challenges and future trends in this field are briefly discussed in this review.     

有机噻吩类衍生物作为电致变色材料*

噻吩类衍生物包括聚噻吩衍生物和齐聚噻吩衍生物。本文从有目的地设计、合成噻吩类衍生物的角度出发,探索了其作为电致变色材料的应用,综述了噻吩类衍生物作为电致变色材料的最新研究进展。     

含铁磁耦合Ni3单元的均苯三甲酸桥联双层镍(II)配合物

使用均苯三甲酸与碳酸镍在水热条件下反应得到了一例新的二维双层Ni(II)配位聚合物Ni3(BTC)2(μ-H2O)2&#61655;6H2O。二维层包含syn-syn羧酸桥和水桥连接的三核Ni3单元,进一步用均苯三甲酸上的苯环连接成二维层状结构。磁性研究表明,相邻Ni2+离子间存在弱的铁磁耦合作用。水桥连镍离子的桥联键角为122.8(3)deg,所以通过该水桥镍离子间应该呈现反铁磁耦合。因此,实验结果证明了syn-syn羧酸桥传递铁磁耦合,而且铁磁耦合大于反铁磁作用,最终配合物呈弱的铁磁耦合。基于本工作和文献报道的含syn-syn 羧酸混合桥联镍配合物的磁性,我们总结出下面结论：Ni–O–C–O–Ni的共面性与否决定了配合物的磁性。共面性好的Ni–O–C–O–Ni导致中等强度的反铁磁耦合,而共面性差会消弱反铁磁作用,甚至出现由反铁磁变为铁磁耦合。标题配合物中羧酸桥所传递的铁磁性可能就归因于Ni–O–C–O–Ni的不共平面性。因此,与含羧酸桥的混合桥联双核铜(II)配合物类似,轨道补偿效应(the orbital complementary effect (OCE))对于解释水/羧酸混合桥联镍(II)配合物的磁性也同样适用。     

9—冠—3衍生物载体锂离子选择性电极

报道了两种９－冠－３衍生物的合成，并以合成的化合物作载体研制了对锂离子响应的ＰＶＣ膜电极。以乙基－９－冠－３为载体的锂离子电极的能斯特响应为１０×１０－１～５２×１０－５ｍｏｌ／Ｌ，斜率为（５７４±０３）ｍＶ／ｐ［Ｌｉ］（２５℃），检测下限为２４×１０－５ｍｏｌ／Ｌ。电极具有良好的稳定性和重现性，用于实际样品测定，结果满意     

Functional Polymeric Materials Based on Main‐Group Elements

The past decade has witnessed tremendous advances in the synthesis of polymers that contain elements from the main groups beyond those found in typical organic polymers. Unique properties that arise from dramatic differences in bonding and molecular geometry, electronic structure, and chemical reactivity, are exploited in diverse application fields. Herein we highlight recent advances in inorganic backbone polymers, discuss how Lewis acid/base functionalization of polymers results in unprecedented reactivity, and survey conjugated hybrids with unique electronic structures for sensor and device applications.     

基于多芳基取代吡啶衍生物的有机光电材料的设计、合成及性能研究

电子传输材料在有机电致发光器件中起着举足轻重的作用,然而相对于高效的发光材料和空穴传输材料的研究,高性能的电子传输材料报道较少.针对电子传输材料研究中存在的问题,本论文选定了具有较高电子迁移率的芳基吡啶衍生物作为主体结构,设计并合成了一系列具有空穴阻挡能力的电子传输材料和新型的具有电子传输性能的绿光发光材料,并开展了OLED器件研究.具体创新性结果如下.     

New Carbon Aerogels Fabricated from Polymeric Materials and Their Properties

Electron microscopy and adsorption-structural, X-ray phase, and thermal analyses were used to determine the density, porosity, microstructure, electrical conductivity, and reactivity of new carbon aerogels based on phenol-formaldehyde polymers.     

具有自修复能力的聚合物材料

各项性能已经达到工程材料指标要求的聚合物材料，在使用过程中不可避免地会产生裂纹，进而在使用过程中包藏着隐患，直至丧失使用价值。裂纹的早期修复，特别是自修复是一个现实而重要的问题。本文介绍了两类修复机制，即共价键与非共价键愈合，重点分析了近年来按共价键机理愈合、具有自修复能力的聚合物材料的研究成果、优缺点及发展前景。     

Polymeric Materials 2000

Russian Journal of Applied Chemistry -     

自修复高分子材料

高分子材料制造和使用过程中,经常由于内部的微裂纹和局部损伤,而导致性能下降,影响使用寿命。自修复高分子材料模仿生物体损伤愈合的原理,自行发现裂纹并通过一定机理自行愈合,是一种有着广泛应用需求的高分子智能材料,包括含修复剂型和不含修复剂型两类。它的特点在于自动化、精准化。本文旨在结合近年来最新的研究成果,介绍并归纳多种典型的自修复体系,总结各种优化手段,并针对已发展的自修复材料存在的局限性,对其研究前景进行合理的展望。     

聚合物发光材料

描述了聚合物的发光原理及发光器件构造,详细地介绍了聚合物发光二极管的发展历史及最新动态,着重于颜色的调谐、发光效率的提高等方面。