Binder effect on cycling performance of silicon/carbon composite anodes for lithium ion batteries

The cycling performance of a silicon/carbon composite anode has been significantly enhanced by using acrylic adhesive and modified acrylic adhesive as binder to fabricate the electrodes for lithium ion batteries. The capacity retentions of Si/C composite electrodes bound by acrylic adhesive and modified acrylic adhesive are 79% and 90% after 50 cycles, respectively. These two binders are electrochemically stable in the organic electrolyte in the working window. They also show larger adhesion strength between the coating and the Cu current collector as well as smaller solvent absorption in the electrolyte solvent than polyvinylidene fluoride (PVDF). Furthermore, sodium carboxyl methyl cellulose (CMC) plays an important role on improving the properties of acrylic adhesive, which increases the adhesive strength of acrylic adhesive and improves the activation of the electrodes.     

聚丙烯酸酯压敏胶带制备及其性能研究

本文研究广丙烯酸酯单体的共聚合反应以及交联型压敏胶带的制备过程，从而确定了最佳工艺条件，并测定了压敏胶带的老化，贮存期，可剥离等性能。     

导静电乳液胶粘剂的研制

用多元乳液共聚法制备了用于粘贴导静电PVC地板胶粘剂,加入乙炔碳黑赋予乳液胶粘剂导静电性能。研究了影响胶接强度和初粘力的主要因素,确定m(VAc)/m(BA+VAc)较合适比为1∶3;研究了乳化剂和交联单体对乳液性能的影响,研究得出,适量加入AA和HMAM可以减少乳化剂的用量,提高乳液的性能;考查了影响导静电性能的因素,研究表明,导静电性能由乙炔碳黑决定,其加入量越大,导静电性能越好。得到的导静电乳液胶粘剂胶接强度达到0.51MPa以上,导静电可达到7.2×103Ω,两项指标均超过国家标准。     

数码彩色喷墨打印纸用涂料的研究进展

较详细地介绍了数码彩色喷墨打印纸用涂料中各个组成部分的选择及其常用颜料、胶粘剂和其它助剂的特点及性质 ,指出将纳米技术和环保技术应用到涂料中是涂料发展的必然趋势。以聚乙烯醇和复合胶粘剂为粘结剂 ,微孔型二氧化硅为颜料制备喷墨打印纸专用涂料是当前的研究热点。     

亚乙基双硬脂酰胺改性淀粉胶的研究

本文采用亚乙基双硬脂酰胺对淀粉胶进行了改性，研究结果表明，亚乙基双硬脂酰胺是热法淀粉胶的有效而廉价的改性剂，对淀粉胶的存性能和使用性能具有综合改性效果。     

环氧树脂-聚丙烯酸酯乳液型复合薄膜粘合剂

本文主要叙述了环氧-丙烯酸酯聚合乳液的合成,以及该乳液粘合剂的配制;讨论了该乳液粘合剂的粘合性能及耐水、耐溶剂性能。     

玉米淀粉胶粘剂的改性研究

以玉米淀粉为主要原料 ,通过预糊化、氧化、加碱糊化进行化学改性 ,并加入稳定剂可制备固含量高、贮存稳定性好 ,具有一定初粘力和透明性的改性淀粉胶粘剂。本论文主要研究了改性玉米淀粉胶粘剂的主要成分配比及工艺条件对产品性能的影响。结果表明 :淀粉氧化前是否进行预糊化处理、氧化剂的用量、体系pH值、加碱糊化时碱液用量、稳定剂的种类和用量等对改性玉米淀粉胶粘剂性能影响较大。     

Durability of Adhesion Between Metals and Polymers

Adequate adhesion between metals and polymers is primarily the result of chemical bonds in the boundary layer. This region, however, is subject to degradation by moisture. Three modes of deterioration are observed. The first is a largely reversible weakening effect in the polymer layer near the metal oxide surface. The structure of this layer differs from that of the bulk and is influenced by the chemical and physical properties of the surface. The second is a slow transformation of the oxide by hydration and a diffusion of oxide constituents into the polymer. This process is irreversible and is influenced by the state of the surface and chemical properties of the polymer. The third is a fast deterioration of the oxide by primary corrosion usually initiating at an unprotected edge but occasionally arising within the body of a joint.     

超细镍基负载型催化剂成型工艺条件研究

以正硅酸乙酯、钛酸丁酯、硝酸镍为主要原料,采用溶胶-凝胶法(Sol-gel)实验室放大制备10 kg工业中试用催化剂粉料，加胶粘剂A进行挤条成型。催化剂前躯体的物化性能用BET、XRD、TG-DTA、TEM及强度测试仪进行表征，用固定床连续流动微反装置，考察催化剂苯加氢生成环己烷的催化性能。研究结果表明，催化剂的强度随胶粘剂的含量增大而增大，当胶粘剂含量达到13％时，NiO/SiO₂-TiO₂体系产生了新的晶相。胶粘剂的含量对催化剂的催化性能影响很小，该催化剂应用于苯加氢制环己烷实验中，苯转化率均为100％，环己烷的选择性均达到99.0％以上。     

Contraction stress build‐up of anisotropic conductive films (ACFs) for flip‐chip interconnection: Effect of thermal and mechanical properties of ACFs

The important mechanical mechanism for the electrical conduction of anisotropic conductive films (ACFs) is the joint clamping force after the curing and cooling processes of ACFs. In this study, the mechanism of shrinkage and contraction stress and the relationship between these mechanisms and the thermomechanical properties of ACFs were investigated in detail. Both thickness shrinkages and modulus changes of four kinds of ACFs with different thermomechanical properties were experimentally investigated with thermomechanical and dynamic mechanical analysis. Based on the incremental approach to linear elasticity, contraction stresses of ACFs developed along the thickness direction were estimated. Contraction stresses in ACFs were found to be significantly developed by the cooling process from the glass‐transition temperature to room temperature. Moreover, electrical characteristics of ACF contact during the cooling process indicate that the electrical conduction of ACF joint is robustly maintained by substantial contraction stress below T_g. The increasing rate of contraction stresses below T_g was strongly dependent on both thermal expansion coefficient (CTE) and elastic modulus (E) of ACFs. A linear relationship between the experimental increasing rate and E × CTE reveals that the build‐up behavior of contraction stress is closely correlated with the ACF material properties: thermal expansion coefficient, glassy modulus, and T_g. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2634–2641, 2004