海洋生物及其粘附机理——藤壶、帽贝、海葵、管栖蠕虫

主要介绍海洋生物中藤壶、帽贝、海葵、管栖蠕虫对其基材的粘附机理。这对于人体生物胶粘剂的研制开发和海洋环境中的防污行业意义重大。     

新型硅改性丙烯酸酯压敏胶的研究

MQ硅树脂可用作改性聚丙烯酸酯类压敏胶,在保持较好力学性能(初粘性、持粘性和剥离强度)和绝缘性的同时,可较大地提高硅改性压敏胶的耐高温性能。MQ树脂的结构和压敏胶的性能用29Si-NMR,DSC,粘性等表征。MQ硅树脂含量对硅改性压敏胶性能影响极大,通常MQ硅树脂用量为(0.3～0.5)%时具有较好的综合性能。该压敏胶粘剂可以直接涂布于经电晕处理的聚酯膜制备压敏胶粘带,便于工业化生产。     

电磁屏蔽涂料的发展现状及趋势

电子产品的日益普及使得电磁干扰成为一个突出问题,应用电磁屏蔽涂料是消除电磁干扰简单而有效的方法,本文介绍了电磁屏蔽涂料的组成、效能评价方法、技术思想、存在的问题以及发展趋势。复合型以及水性屏蔽涂料具有广阔的研发前景,高效能、宽频带、寿命长的电磁屏蔽涂料将会受到市场欢迎。     

可生物降解热熔胶粘剂的研究进展

综述了近年来可生物降解热熔胶的发展、合成、性能、应用、最新的研究进展。     

Zinc Coated Steel/Epoxy Adhesive Systems: Investigation of the Interfacial Zone by FTIR Spectroscopy

The present study takes advantage of the ability of Fourier Transform Infrared Spectroscopy (FTIR) for the analysis of ultrathin organic films on metals. FTIR in the reflection mode (IRRAS) is used in order to study the interaction of ultrathin films of dicyandiamide (hardener of most one-pack epoxy resins) with various substrates, model ones such as gold or zinc and industrial ones such as steel and zinc-coated steels.

Pure zinc surfaces and, to a lesser extent, zinc-coated steels are shown to react with dicyandiamide after heating at 180°C, as evidenced by the frequency shift of the absorption band (at about 2200 cm^-1) characteristic for nitrile groups. As real systems consist of thick layers of a fully formulated adhesive cured onto a metallic substrate, the direct investigation of such a buried interphase is no longer possible by FTIR and by most of the known spectroscopies. Some mechanically tested specimens are then analysed, after failure, by FTIR microspectrometry. The spectra obtained, corresponding to the fracture initiation zone which is about 100 μm in diameter, advocate for the presence of an ultrathin layer of modified polymer still covering the substrate.     

The Interlaminar Bond Strength of Flexible Polymer-Metal Laminates

An alternative test method to the traditional 180° “T” peel test has been developed for the measurement of interlaminar bonding in three-ply (polyester/aluminium/polypropylene) flexible-packaging, laminate materials. The new test is thought to involve mixed mode I (opening) and mode II (shearing) failure, and takes into account the yielding of the polypropylene layer during testing. The method allows more direct comparisons between materials to be made, and allows the measurement of strong bonds, where a peel test would result in yield or fracture of the substrate arms before debonding.     

软段含离子基团的阴离子型水性聚氨酯胶粘剂的研究(Ⅱ)——硬段结构的影响

以含有不同离子基团的聚酯多元醇为软段,采用丙酮法合成了一系列水性聚氨酯乳液。研究了不同硬段结构和硬段含量和扩链剂对其干膜物理机械性能和吸水率的影响。     

导电聚苯胺复合纤维的研制

利用氧化聚合法，在室温、常压下快速将苯胺聚合在极性纤维表面，从而赋予纤维优良的导电性能，其表面电阻达到１０￣３Ω／ｃｍ。同时对导电性能的耐洗牢度进行了初步研究。     

高强度快干变性淀粉粘合剂的研究及在纸制品包装中的应用

本文介绍了高强度快干变性淀粉的制备原理和工艺,以及用该变性淀粉调配瓦楞纸板用粘合剂的方法和应用情况。讨论了变性淀粉粘合剂的初粘力,干燥速度等并与普通淀粉粘合剂作了比较。     

Conductive Papers Containing Metallized Polyester Fibers for Electromagnetic Interference Shielding

Conductive papers were developed for preventing or reducing electromagnetic interference (EMI), and their shielding efficiency was evaluated. This type of conductive paper consists of wood pulp, synthetic pulp and metallized polyester fibers (0.5–2.0 mm long and 14 m in diameter) whose surfaces are coated with nickel alone (Ni-PET) or copper and nickel double layers (Ni-Cu-PET) by electroless plating. In this report, the effect of the characteristics of these metallized fibers, such as their conductivity, geometry and the concentration of fibers in paper, which lead to high efficiency for shielding effectiveness is discussed. For instance, one of the conductive papers (80 g/m2) which was prepared by mixing 40% Ni-Cu-PET and 60% synthetic polyethylene pulp showed over 40 dB shielding effectiveness between 10 MHz and 1 GHz.