双马来酰亚胺树脂体系在封装基板上的应用

介绍了半导体IC封装技术和封装基板的技术发展需求,阐述了双马来酰亚胺树脂的改性方法及其在封装基板上的应用,分析了三菱瓦斯化学公司的双马来酰亚胺-三嗪树脂(BT树脂)材料封装基板的特性,结果表明,该树脂可满足封装领域的技术要求,应用前景广阔.     

双马来酰亚胺一三嗪树脂及其改性研究进展

综述了BT树脂的研究和改性情况。介绍了BT树脂固化机理的研究情况和优异的综合性能以及广泛的应用领域(特别在PCB行业)。着重介绍近年来国内外学者对BT树脂改性研究的进展,并且对我国BT树脂的发展趋势进行展望。     

聚对苯二甲酰对苯二胺树脂共缩聚改性研究进展

介绍了在聚对苯二甲酰对苯二胺(PPTA)树脂主链骨架改变、侧基上引入取代基和超支化结构等改性方法的研究现状,评价了几种方法的改性效果.分析结果表明,主链骨架改变和侧基上引入取代基改行方法仍是目前研究的主要方向;改善PPTA树脂性能的有效方法是改变聚合物的化学结构.     

不饱和聚酯树脂改性研究新进展

综述了不饱和聚酯模树脂(UPR)改性研究的最新进展,重点介绍了UPR低收缩改性、增韧、阻燃等改性方法,指出了UPR改性存在的问题及其发展方向.     

氰酸酯-双马-碳氢复合树脂体系固化反应动力学及性能

本研究将碳氢(CH)树脂引入氰酸酯-双马(BT)树脂体系制备了氰酸酯-双马-碳氢(BT-CH)复合树脂体系及BT-CH覆铜箔层压板。利用差示扫描热量法(DSC)、傅里叶红外光谱(FTIR)、扫描电镜(SEM)研究了BT-CH复合树脂体系的固化反应动力学参数，考察了固化后BT-CH复合树脂体系的介电损耗(D_f)以及热氧老化性能。结果表明：BT-CH复合树脂体系的反应级数、活化能、频率因子小于BT体系，CH树脂对BT树脂的固化反应有促进作用。BT-CH覆铜箔层压板的红外光谱中，氰酸酯基团、酰亚胺基团、乙烯基集团特征峰消失或减弱，三嗪环特征吸收峰出现，树脂体系反应充分。扫描电镜显示基板无空洞等微观缺陷。BT-CH基板的D_f比BT基板提高了25%，其在153℃下热氧老化4周后D_f增加6%，具有优异的耐热氧老化性能。     

聚酯亚胺体系浸渍树脂的性能研究

利用单官能改性聚酯技术,采用高沸点高活性的乙烯基甲苯作活性稀释剂,研制了环氧改性聚酯亚胺无溶剂浸渍树脂.采用示差扫描量热分析(DSC)对聚酯亚胺无溶剂浸渍漆的固化过程进行动态扫描,通过T～β外推法确定了该浸渍漆的固化工艺参数,并研究聚酯亚胺树脂的环氧含量对浸渍树脂的粘结强度和介质损耗因数等的影响.结果表明:研制的环氧改性亚胺浸渍树脂具有粘结强度高、介质损耗低、工艺性好等特点,是一种性能优良的绝缘材料.     

新型耐高温BT树脂与应用

BT树脂是国外七十年代迅速发展起来的一种新型耐高温聚合物。它是以双马来酰亚胺和三嗪树脂的混合物或予聚物组成的双马来酰亚胺三嗪树脂,简称为BT树脂。 BT树脂具有优异的成型性和工艺性。固化后的产物具有高的耐热性、电气特性、耐潮湿性、耐磨性、尺寸稳定性以及很好的高温机械强度。BT树脂毒性很小,这对它的推广和应用是极为有利的。 BT树脂有很高的反应性,可用酚醛、环氧、聚酯等树脂同样的成型方法进行加工。克服了象聚酰亚胺等耐高温树脂成型加工困难的缺点。目前,BT树脂以它独有的特点,自成体系而发展了一系列F、H级电工产品。例如:有溶剂和无溶剂浸渍漆、层压制品、成     

热固性树脂改性氰酸酯树脂的研究进展

本文介绍了热固性树脂改性氰酸酯(CE)树脂的研究现状,主要阐述了环氧树脂(EP)、双马来酰亚胺树脂(BMI)、苯并噁嗪树脂(BOZ)或多元化合物共聚改性氰酸酯树脂(CE)的研究进展,指出了上述热固性树脂改性氰酸脂的优缺点,并展望了氰酸酯树脂的发展前景。     

M树脂的合成及其应用研究的初步探讨(摘要)

本研究是在聚合物分子设计的基础上,运用“侧基技巧”对双马来酰亚胺进行改性。侧基的引入,不仅取代了分子结构中的活性基团,延长了胶粘剂的使用期限,而且还改善了该聚合物的溶解性和机械性能。改性双马来酰亚胺是一种具有良好耐热性的环氧树脂固化剂(M树脂)。在对环氧—M树脂、环氧—M树脂—桐油酸酐、环氧—M树脂—混合酸酐三条     

烯烃取代氰酸酯改性双马来酰亚胺树脂的研究进展

综述了以烯丙基氰酸酯、丙烯基氰酸酯改性双马来酰亚胺(BMI)树脂的研究工作现状。研究表明，通过烯烃取代的氰酸酯将三嗪环和烯丙基同时引入双马来酰亚胺树脂中。不仅很少降低或者可以保持双马来酰亚胺树脂的耐热性，而且可改善其柔韧性和电气性能。     

Chemical Variations in Barium Titanate Powders and Dispersants

Commercial raw materials for multilayer ceramic capacitors—barium titanate (BT) and ammonium polyacrylate (APA) dispersant—were examined for lot-to-lot variations which cause poor reproducibility in BT slips and in capacitor chips. Two lots of BT supplied by a commercial source were different with respect to surface species examined by Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, electrokinetic sonic amplitude and total carbon analysis. It was found that there was more APA dispersant chemisorption on BT when the BT surface was more hydroxylated and less carbonated. For the dispersant, the two lots differed in pH and ammonium ion content. The amount of APA dispersant adsorbed on BT depended more on the ceramic powder surface species than on the chemical differences in APA lots.The electrokinetic sonic amplitude (ESA) and zeta potentials of the two lots of as-received BT were small but positive. The BT lot with more surface hydroxyls exhibited slightly higher zeta potential values. The BT with more carbonate was more stable in terms of aging rate in water. Aging in water increased the positive zeta potential by increasing Ba²⁺ dissolution and adsorption. With the APA dispersant, the BT surface became less positive, but more stable and exhibited an isoelectric point of10.6. It can be concluded that the dispersion of BT in the as-dispersed pH range is mainly by steric stabilization with little contribution from electrostatic charges.     

高介电常数的聚合物基纳米复合电介质材料

高介电常数的聚合物基电介质材料无论是在电力工程,还是在微电子行业都具有十分重要的作用。研究中主要以聚偏氟乙烯(PVDF)为基体,以纳米和微米尺度的高介电常数的铁电陶瓷钛酸钡(BT)的前驱体粉末为功能添加组分,采用特殊的工艺制备了高介电常数的聚合物基纳米功能电介质复合材料。研究了制备工艺、添加物含量、以及微米/纳米BT的体积比等因素对复合电介质材料介电性能的影响。发现在无水乙醇中,通过纳米BT与PVDF颗粒之间强烈的吸附作用以及热模压工艺,可以制备高度分散性的BT/PVDF纳米复合材料。同时通过合理的组合微米/纳米BT的体积比,在BT同样的体积含量时,微米/纳米BT的共混物对复合材料介电性能的提高有明显协同效应。利用该效应可以制备介电常数高的聚合物基电介质材料。     

粉末树脂过滤器在凝结水精处理系统中的应用

主要介绍了粉末树脂过滤技术的特点，粉末树脂在凝结水精处理应用的具体要求，以及经济性分析比较，认为粉末树脂过滤技术与深层混床技术在凝结水精处理系统均是可行的，对于精处理系统的选择应根据电厂的实际情况来选择最佳系统。     

Evolution of ferroelectric and piezoelectric response by heat treatment in pseudocubic BiFeO<Subscript>3</Subscript>–BaTiO<Subscript>3</Subscript> ceramics

Heat treatment of ceramics is an important process to tailor the fine electromechanical properties. To explore the criteria for optimized heat treatment in a perovskite structure of (1–x)Bi_1.05FeO₃–xBaTiO₃ (BF–BT100x) system, the structural phase relation, ferroelectric and piezoelectric response of BF–BT36 and BF–BT40 ceramics prepared by furnace cooling (FC) and quenching process were investigated. The X-ray diffraction examination showed single pseudocubic perovskite structure for all the ceramics. The homogenous microstructure was obtained for all ceramics with relatively large grain size in the furnace cooled samples. Well saturated ferroelectric hysteresis loops and enhanced piezoelectric constant (d₃₃?=?97 pC/N) were achieved by quenching process. Dielectric curve of BF–BT36 showed large dielectric constant at its Curie temperature, however, BF–BT40 showed diffused relaxor-like dielectric anomalies. Quenched BF–BT36 samples showed typical butterfly like field induced strain curves, however negative strain decreased in BF–BT40 ceramics. From these investigated study, it is observed that BF–BT ceramics are very sensitive to the heat treatment process (furnace cooling and quenching) on the dielectric, electromechanical properties.     

TEM Characterization and Raman Spectra of Hydrothermal BaTiO3 Nanoparticles

Microstructures of BaTiO₃ (BT) nanoparticles synthesized by hydrothermal process, were investigated by transmission electron microscopy (TEM) and Raman spectra. TEM images showed that BT nanoparticles synthesized at high Ba/Ti molar ratios in the precursors had large particle sizes and cubic morphology. Small faceted-particles were observed in the BT powders synthesized by using ethylene glycol (EG) as solvent, in comparison to reactive medium of pure water or water-EG mixed solution. X-ray diffraction and selected area electron diffraction revealed that the as-produced BT nanoparticles exhibited a room temperature-stabilized cubic structure, whereas Raman spectra indicated a tetragonal phase BT existing in the produced nanoparticles, which is not the dominant phase due to the weak characteristic peak of tetragonal structure at 305 cm^?1. HRTEM images demonstrated that the BT nanoparticles with either cubic or rectangular shapes, were bounded by their {100} facets, and a terrace-ledge-kink surface structure was frequently observed at the edges of rough nanoparticles. Surface steps lying on the {100} planes were clearly observed. However, in the spherical nanoparticles, their surface edges were very smooth, and no surface steps were observed.     

Grain-size effects on the hardness of nanograin BaTiO3 ceramics

Dense nanocrystalline BaTiO₃ (BT) ceramics with grain size (GS) 50 nm were successfully prepared by spark plasma sintering (SPS) method. The nanoindentation experiment was used to test the hardness of different GS BT ceramics. It was found that the hardness of 50 nm nanograin BT ceramics increased 82% than that of 1.2 μm BT ceramics fabricated by conventional sintering (CS) process. Dislocation pinning resulting from the increase of grain boundary by ultrafine GS are believed to be the dominant factor in raising strength. Restriction on dislocation generation and mobility due to the domain wall motion and sliding imposed by ultrafine GS are expected to be exceptionally important. At the same time, the large stress in nanograin BT ceramics may also play a role in producing high strength. These differences of the hardness behavior between BT ceramics are attributed to the variation of the resultant microstructure, especially the GS of the ceramics.     

电厂精处理混床树脂再生度测定方法研究及应用

树脂再生度是表征高速混床树脂再生程度的指标。基于电厂实际需要,结合高速混床离子交换树脂性能特点和离子交换水处理再生工艺,建立了一种运行树脂再生度测试方法,用于电厂凝结水精处理混床树脂再生度的定量测定。     

基于DM642的视频采集与处理系统设计及实现

DSP作为一种具有强大数据处理能力和高运算速度的微处理器,以其为核心的嵌入式实时图像采集处理系统越来越受到广泛的关注和应用.基于TMS320DM642处理器设计构建硬件平台,采用JPEG图像压缩编码技术,实现了实时视频采集和处理.重点研究了在TMS320DM642处理器平台上实现对ITU-R BT.656 YUV4∶ 2∶2视频格式进行JPEG压缩编码的具体方法.并在此基础上,对实验数据进行了分析.     

我国电线电缆专用树脂市场概况

在4篇文献的基础上从电线电缆专用树脂的技术及市场角度，对电线电缆的行业及技术状况进行了分析。阐述了国内外电线电缆专用树脂的差距及国内通讯电缆专用树脂、电力电缆专用树脂的发展趋势，提出了对电线电缆专用树脂的供应和改进建议。