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1.
本征导电聚合物的智能性   总被引:6,自引:1,他引:5  
在化学掺杂或电化学掺杂过程中,性质发生可逆性变化的本征导电聚合物是一种潜在的智能材料,可望实现或部分实现传感、处理和执竽功能,适于制成电机执行器、智能窗、化学分离与释放体系、传感器和非线性光学器件等。  相似文献
2.
智能表面   总被引:3,自引:0,他引:3  
智能表面就是在基材表面自组装成单分子层或接枝(环境敏感性)线性高分子刷,通过环境刺激,使表面性能如亲水/憎水、酸性/碱性、导电/绝缘、粘结/排斥、吸附/脱附等发生(可逆)变化。根据环境刺激的类型可以分为以下几类:溶剂响应、温敏性、电场响应、pH响应型以及光敏性智能表面。本文对此五种类型的智能表面作一介绍。  相似文献
3.
(甲基)丙烯酸高级醇酯的合成及其应用   总被引:2,自引:0,他引:2  
综述了(甲基)丙烯酸高级醇酯的主要合成方法、合成反应中影响酯产率的主要因素及其在具有“温度开关”特性的智能材料、原油降粘剂、增稠剂、吸油性树脂、复鞣加脂剂、流平剂等领域的应用。  相似文献
4.
基于聚N-异丙基丙烯酰胺的细胞智能分离材料   总被引:1,自引:0,他引:1  
聚N-异丙基丙烯酰胺(PNIPAm)在水中是具有温度响应性的智能高分子材料,可用于细胞培养和自动脱附。本文从材料的制备方法出发,介绍了电子束照射接枝、等离子体处理接枝、表面活性自由基聚合、水凝胶等方法制备的材料对细胞培养及脱附的影响;阐述了细胞的脱附机理;讨论了加快细胞脱附的方法,包括共聚改性PNIPAm、PNIPAm接枝多孔膜、聚乙二醇(PEG)共聚PNIPAm接枝多孔膜、聚偏氟乙烯(PVDF)膜辅助细胞转移。从PNIPAm温敏性材料表面智能分离得到的细胞片因结构完整并保留了细胞外基质成分,在组织修复中得到了应用。  相似文献
5.
An intelligent biomembrane for environment-responsive feedback releases has been developed using radiation techniques. Various fine-porous base membranes (polyester, polycarbonate, silicon) were prepared by hole fabrication techniques with excimer-laser, ion-beam etching and photo-lithography etching. Then, various monomeric mixture of stimuli-sensitive hydrogels with or without immobilized enzymes were coated and polymerized on the porous membrane by UV, γ-ray or electron beam. The product showed the intelligent feedback release functions of model substance (methylene blue) in response to the on–off switching of signals such as pH changes and introduction of electric field. The responsiveness was remarkably improved by radiation induced IPN (interpenetrating polymer network) formation. Intelligent release controlled by a computer program was also studied and proved.  相似文献
6.
 In this paper we summarise the effects induced by electric and magnetic fields on the mobility and shape of polymer gels containing a complex fluid as a swelling agent. Magnetic-field-sensitive gel beads and monolith gels have been prepared by introducing magnetic particles of colloidal size into chemically cross-linked poly(N-isopropylacrylamide) and poly(vinyl alcohol) hydrogels. The influence of uniform and nonuniform fields has been studied. In uniform magnetic fields the gel beads form straight chainlike structures, whereas in nonhomogeneous fields the beads aggregates due to the magnetophoretic force directed to the highest field intensity. The ability of magnetic-field-sensitive gels to undergo quick, controllable changes in shape can be used to mimic muscular contraction. Received: 26 July 1999/Accepted: 27 August 1999  相似文献
7.
复合多孔树脂以其调湿速度快、湿含量高等特点比传统多孔硅胶更适合作为智能调湿材料。本文利用氢氧化铝高温分解产生活性氧化铝并释放水蒸气的致孔途径制备出复合多孔树脂。通过TG、SEM、 FTIR、XRD和氮气吸附等手段表征了该树脂的形貌和结构特征,测试了复合多孔树脂分别在高湿和低湿环境的调湿性能和饱和湿含量,讨论了多孔树脂在不同温度条件的调湿性能和在25℃时对微量甲醛的吸附性能。结果表明:本文的致孔方法能有效地使树脂内部形成多孔结构。复合多孔树脂具有良好的调湿和甲醛吸附性能。在制备过程中通过控制树脂内部的孔参数,材料能将空间相对湿度在4h内调控并维持在50%—60%的范围之内,且不受温度变化的影响,甲醛吸附量为5.55ppm/g。材料可以作为智能调湿材料用于文物保护,为文物存放环境创造一个恒湿干净的空间。  相似文献
8.
9.
A novel copolymer P(CS–Ma–DMAEMA) was synthesized with chitosan (CS), maleic anhydride (Ma) and 2-(dimethylamino)ethyl methacrylate (DMAEMA) by grafting and copolymerization. The copolymer obtained was analyzed by FT-IR, 1H NMR and UV, and the molecular weight and polydispersity were determined by gel permeation chromatography (GPC). The average size and distribution of copolymer micelles were determined by dynamic light scattering (DLS). Their aqueous solution properties and controlled coenzyme A delivery were also studied. It was found that the copolymer had temperature sensitivity and pH sensitivity. The factors affecting release behavior, such as concentration, pH and temperature were discussed in this paper. The higher concentration of the copolymer aqueous solution absorbed more coenzyme A than the lower one. The increasing temperature accelerated the drug release from the copolymer. The pH of the copolymer solution had significant impact on the release of coenzyme A. The results suggested that the novel copolymer could be used as drug delivery carrier.  相似文献
10.
The facile synthesis of several 1,3‐diazabicyclo[3.1.0]hex‐3‐ene derivatives with varying substitutions such as 2‐methyl‐6‐(4‐nitrophenyl)‐2,4‐diphenyl‐( 1 ), 2‐methyl‐6‐(4‐nitrophenyl)‐4‐phenyl‐2‐(pyridin‐3‐yl)‐( 2 ), 2‐(furan‐2‐yl)‐6‐(4‐nitrophenyl)‐4‐phenyl‐( 3 ), 2‐(furan‐2‐yl)‐6‐(3‐nitrophenyl)‐4‐phenyl‐( 4 ), 6‐(3‐nitrophenyl)‐2,4‐diphenyl‐( 5 ) and 6‐(4‐chlorophenyl)‐4‐(3‐nitrophenyl)‐2‐phenyl‐( 6 ) that all behave as “intelligent materials” are reported.  相似文献
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