使用导电性粘结剂的安装技术

目前,以欧洲为中心开发的使用导电性粘结剂的安装技术很引人注目,并在实际应用上已取得了显著的成果.     

无粘结剂聚酰亚胺覆铜板

本文概述了无粘结剂聚酰亚胺覆铜板的种类和特性,尤其适用于无Pb焊料安装用的挠性印制板的制造.     

有机粘结剂的工艺问题及对策

本文结合ＨＩＣ电子组装中的典型实例，论述了使用有机粘结剂时易出现的问题，提出了切实可行的解决办法，并提出了使用有机粘结剂应注意的问题。     

涂料用粘结剂的热辐射性能评定

测定了５种涂料用粘结剂的光学常数并计算了其不同光谱范围内的积分发射率。对影响积分发射率的因素进行了讨论。计算结果表明：聚烯烃漆的发射率最低，聚酞胺漆次之，环氧漆、丙烯酸漆和有机硅漆均有较高的发射率。     

利用导电性聚合物的直接电镀工艺

概述了利用导电性聚合物的直接电镀工艺,适用于制造孔金属化印制板。     

锂盐型电力复合脂的导电性和摩擦学性能

在强调了研究锂盐型电力复合脂的导电性和摩擦学性能的重要性的基础上,从实验的角度出发对锂盐型电力复合脂的导电性和摩擦学性能进行了详细的分析,并对实验结果进行了讨论.     

红外辐射涂料用粘结剂的研制

对用于红外辐射涂料的硅酸盐型粘结剂的改性及最佳配比进行了探讨，并得出有益的结论。     

飞机复合材料搭接结构导电性研究

分析了复合材料的组成、导电特性,以及与复合材料导电性相关的因素.介绍了航空设备中部分复合材料结构件的装配工艺方法,描述了这种方法可能对其电性能和EMC性能的影响,并结合试验结果给出了工艺指导意见.     

A Universal Aqueous Conductive Binder for Flexible Electrodes

The development of wearable electronics has led to new requirements for flexible and high-energy batteries. However, the conventional polyvinylidene fluoride binder fails in the manufacture of high-loaded and thick battery electrodes owing to its insufficient adhesiveness and electronic insulation, let alone for flexible devices. Furthermore, organic processing is expensive and not eco-friendly. Herein, the authors report a novel aqueous conductive binder made of carbon nanotubes interwoven in cellulose nanosheets, successfully satisfying the fabrication of flexible yet high-strength electrodes for universal active materials of different sizes, morphologies, and negative-to-positive working potentials, with a high mass loading of up to ≈ 90 mg cm⁻². The conductive binder has an ultrathin 2D-reticular nanosheet structure that forms continuous conductive skeletons in electrodes to segregate and warp active particles via a robust “face-to-point” bonding mode, allowing the fabricated electrodes to have remarkable flexibility and excellent mechanical integrity even under various external forces and excessive electrolyte erosion. Flexible LCO cathodes with a mass loading of > 30 mg cm⁻² as a case study exhibit high mechanical strength ( > 20 MPa) and can easily achieve an ultrahigh areal capacity of 12.1 mAh cm⁻². This cellulose-based binder system is ideal for advanced high-performance functional devices, especially for flexible and high-energy batteries.     

Electrical Properties of Isotropic Conductive Adhesives Composed of Silicone-Based Elastomer Binders Containing Ag Particles

The electrical properties of isotropic conductive adhesives (ICAs) with two different types of silicone-based binder containing Ag particles were examined. The ICAs were printed on glass substrates in order to prepare specimens for evaluating the electrical properties. In the case of adhesives containing a denatured silicone binder, both the curing and cooling steps in the isothermal curing process generated electrical conductivity. Adhesives that were cured at 120°C to 200°C exhibited similar values of electrical resistivity regardless of the different curing temperatures. By contrast, electrical conductivity was generated only during the cooling step when adhesives containing a dimethyl methylvinyl siloxane were isothermally cured. In this case, adhesives cured above 160°C exhibited high electrical resistivity. In evaluating the temperature dependence of the electrical resistivity, we found physical annealing to have significantly different effects on these specimens. In addition, we were able to make small sensitive variations in the properties of silicone-based ICAs by controlling the isothermal annealing and thermal cycling processes.     

无铅焊料安装元件的可靠性评价和解析技术

概述了无铅焊料安装元件的可靠性评价和解析技术,以满足电子和汽车工业领域的顾客需要。     

导电胶性能对器件分层的影响

近年来客户对器件可靠性要求越来越高,而分层对可靠性的影响至关重要。跟分层密切相关的两种主要封装材料分别为塑封料和导电胶,文中重点对LQFP类导电胶进行性能比较、分层试验和相关性分析,明确了导电胶的相关性能对器件分层的影响程度,从而选择合适的导电胶来改善和提高器件的可靠性。     

导电胶的力学性能研究

导电胶主要是由环氧树脂基体和导电粒子组成的复合导电聚合物,其力学性能主要是由聚合物基体决定,基体是粘弹性材料,具有时间和温度依赖性。文章建立了一个基于时间-温度、时间-固化度的宏观粘弹性本构关系来描述导电胶在固化过程中的粘弹性行为,通过动态力学试验（DMA）表征导电胶的粘弹性行为,测定导电胶的粘弹性参数。通过对导电胶粘弹性行为表征,能更好的优化固化工艺参数。     

两种炭黑导电橡胶复合材料的电磁屏蔽性能

采用炭黑分别填充丁苯和丁腈橡胶,研究两种不同橡胶基体对炭黑的分散性能及复合材料导电性能、电磁屏蔽性能的影响。对比发现,丁苯橡胶基体中炭黑分散性能随炭黑含量增多而变差,而在丁腈橡胶中炭黑的分散性能呈相反趋势,随炭黑含量增多而变好。丁腈导电橡胶的导电性能以及电磁屏蔽性能要好于相同炭黑含量的丁苯导电橡胶。     

各向异性导电胶膜新型填充粒子的研究

用分散聚合法合成了直径为3μm左右的聚苯乙烯核,在核表面化学镀形成带小突起的镍合金导电层,制成ACF新型填充粒子,对聚合物核做了粒径分布、比表面积测试,对核以及导电微球做了环境扫描电镜(ESEM)测试。结果表明:制备的导电微球密度小,呈单分散,镀层结构致密,镀层表面形成了近球形、锥形及其它不定形突起。这些突起可以刺穿电极的氧化膜。实践证明通过控制工艺参数实现控制镀层结构是一条可行方法。     

导电聚合物及其在隐身技术中的应用

介绍了导电聚合物的种类和性质,叙述了复合型导电聚合物和电子导电型聚合物的组成结构、导电机理及其制备方法,论述了导电聚合物在隐身技术中的研究和应用情况,简要总结了导电聚合物在隐身技术领域的发展方向．     

Rotatable Methylene Ether Bridge Units Enabling High Chain Flexibility and Rapid Ionic Transport in a New Universal Aqueous Conductive Binder

Binders play an essential role in maintaining the mechanical integrity and stability of electrodes. Herein, a novel aqueous and conductive binder (OXP/CNT-1.5) consisting of carbon nanotubes (CNTs) interwoven with a flexible nano-film of oxidized pullulan (OXP) is designed. The rotatable methylene ether bridge units within OXP chain endow the binder with high chain flexibility, facilitate rapid ion transport, and buffer severe volumetric expansion during charge-discharge cycling. Furthermore, its tight intertwining with CNTs forms continuously conductive and flexible skeletons, which can firmly grasp active nanoparticles through a “face-to-point” bonding type, guaranteeing the electrodes high conductivity and outstanding mechanical integrity. More importantly, these conductive binders are applicable to the Si/C anode as well as the LiFePO₄ cathode. The as-fabricated Si/C anode delivers a 88.2% capacity retention after 100 cycles and 80.2% capacity retention at 0.5 A g⁻¹ (vs 0.05 A g⁻¹), far surpassing the electrode fabricated by conventional polyvinylidene fluoride binder and carbon black mixtures. The LiFePO₄/Si/C full cells based on OXP/CNT-1.5 demonstrate excellent electrochemical behavior and stability (97.4% capacity retention after 100 cycles). This work highlights the key role of rotatable methylene ether bridge units to enhance the flexibility, ion conductivity, and stability, which is inspiring in the context of designing novel binders for high-performance batteries.     

改性乙丙橡胶红外透明粘合剂研究

通过对乙丙橡胶改性,获得了在８－１４μｍ波段具有较好透明性能的粘合剂,该粘合剂在红外隐身方面具有一定的应用价值。