镍包石墨粉聚酰亚胺导电胶的制备与性能表征

先将石墨粉预处理,后采用化学镀法与配制的镀液制备镍包石墨粉,最后加入聚酰亚胺树脂超声制备镍包石墨粉聚酰亚胺导电胶。对合成的镍包石墨粉进行SEM(扫描电镜)表征,探讨超声时间对剪切强度的影响、使用温度和填料含量对体积电阻率的影响、固化温度对电导率的影响以及导电胶在镀铜基板和镀锌基板上接触电阻的比较。研究结果表明:化学镀温度为80℃时,镍包石墨粉包覆效果良好;超声时间15 min、固化温度170℃、填料含量8%制备的导电胶性能较佳,且导电胶使用温度不宜超过200℃;导电胶在镀铜基板上的老化表现优于镀锌基板。制备的镍包石墨粉聚酰亚胺导电胶基本达到了作为导电胶的使用需求,进一步研究应用具有一定的市场前景。     

钛酸钡陶瓷粉作为导电填料的导电胶及其制备方法

钛酸钡陶瓷粉作为导电填料的导电胶及其制备方法,它涉及一种导电胶及其制备方法。本发明解决了采用金属作为导电填料的导电胶制备成本高、老化试验后体积电阻变化大的问题。     

石墨烯改性导电胶的制备及导电机理研究

以环氧树脂(EP)为基体、聚苯胺为助剂、铜粉为导电填料和石墨烯为改性剂,采用共混法制备了高导电性、高粘接强度、低成本和固化后不易开裂的导电胶,并对其导电机理进行了分析。研究结果表明:铜粉作为导电填料,可使导电胶的成本大幅降低,当w(铜粉)=60%(相对于EP质量而言)时,导电胶的导电性能相对最佳(体积电阻率为4.14×10~(-3)Ω·cm)。石墨烯可进一步改善导电胶的导电性能,当w(石墨烯)=0.05%(相对于EP质量而言)时,导电胶的体积电阻率(2.78×10~(-3)Ω·cm)相对最低。石墨烯在胶体内形成类似钢筋骨架作用的网络结构,使填料之间连接更紧密,从而有效提高了导电胶的导电性能和力学性能,解决了导电胶固化后易开裂、韧性不足等难题。     

铜粉添加型导电胶的研制

以环氧树脂E-51为导电胶基体树脂、二乙烯三胺为固化剂,采用硅烷偶联剂(KH-550)对铜粉进行改性处理,并以此作为导电填料,制备了热固化各向同性导电胶。通过正交实验探讨了固化剂、硅烷偶联剂、还原剂、稀释剂和导电填料等因素对导电胶固化性能、粘接性能和导电性能的影响,并对导电胶的制备参数进行优化,得到了制备导电胶的最佳方案。实验结果表明,所制备的热固化各向同性导电胶具有制备工艺简单、粘接强度高(剪切强度≥20 MPa)和导电性能好(体积电阻率为1.50×10-3Ω·cm)等特点;经室温1000h老化实验后,导电胶的体积电阻率和剪切强度变化率<20%。     

聚酰亚胺基各向同性导电胶的合成研究

在碳纳米管表面镀银后,填充入聚酰亚胺基体树脂中制备各向同性导电胶,并对其进行表征,还探讨了固含量对粘接强度的影响以及导电胶的耐酸碱性.研究结果表明:镀银碳纳米管被聚酰亚胺有效包覆,有效提高了胶粘剂的耐热性;其填充含量的增大对提高导电胶的导电性和拉伸剪切强度影响较大,当固含量为15％时,导电胶粘接强度最大(为15.6 M...     

松香基聚酰胺在各向同性导电胶中的应用

以马来海松酸酐、二乙烯三胺为原料,合成了松香基聚酰胺,并以其为固化剂,以环氧树脂618为导电胶基体,Ag包Cu粉为导电胶填料,KH560、聚乙二醇(200)为促进剂,制备了Ag包Cu粉导电胶,讨论了各因素对导电胶剪切强度、导电性能的影响,并测定了导电胶的玻璃化温度及耐热性能.结果表明,环氧树脂与松香基聚酰胺在固化质量比...     

紫外光固化导电胶的研制

以环氧丙烯酸树脂和聚丙烯酸树脂为基体、微米级片状镀银铜粉为导电填料制备紫外光固化导电胶,采用光引发剂与热引发剂复合引发体系实现导电胶的深层固化。对紫外光固化导电胶的影响因素进行了研究,制备出的导电胶体积电阻率可达(1.0~2.0)×10-4Ω.cm。     

高性能室温固化双组分导电胶的制备及性能研究

以环氧树脂基体与微米片状银粉为原料制备了银导电胶组分A,并与自制固化剂配合制备出无溶剂、室温24 h固化和100℃加热快速固化的双组分导电胶。研究了银粉种类、填料含量及固化剂种类对导电胶室温固化和100℃加热固化后电学和力学性能的影响,并提出固化剂对银粉表面包覆影响双组分导电胶电学性能的导电机理,分析了固化剂对银粉表面包覆状态与导电胶导电性的关系。研究结果表明：对微米片状银粉进行适当处理后,导电胶的较佳填料负载量为81%。自制固化剂(ECA-lab)作为组分B的导电胶,室温固化电阻率低至1.60×10^-3Ω·cm,剪切强度高达11.05 MPa,可与市售进口导电胶媲美。     

紫外光固化环氧丙烯酸树脂导电胶

以环氧丙烯酸树脂为基体树脂、微米级片状铜粉为导电填料制备紫外光固化导电胶,采用光引发剂与热引发剂复合引发体系实现导电胶的深层固化。对紫外光固化导电胶的影响因素进行研究,制备出的导电胶电阻率可达1.3×10-3Ωcm,剪切强度为1.3MPa。     

基于片状结构填料导电胶的制备与性能研究

以纳米银片及石墨烯为导电填料,双酚A型EP(环氧树脂)为基体,制备了相应的导电胶。采用SEM(扫描电镜)、EDS(能量散射谱)等对导电胶的形貌和成分进行了表征,并着重探讨了固化温度和固化时间对导电胶剪切强度的影响、石墨烯含量对导电胶电导率的影响。研究结果表明:石墨烯已掺入至纳米银片中,导电填料具有均匀的片状结构;Ag NS-G(纳米银片-石墨烯)基EP导电胶在80℃时固化效果良好;当w(石墨烯)=0.5%(相对于导电胶总质量而言)时,导电胶的电导率相对最高。     

Using of carbon nanotubes and nano carbon black for electrical conductivity adjustment of pressure-sensitive adhesives

Electrical conductive pressure-sensitive adhesives (PSAs) are not commercially available on the market. The development of these PSAs requires special suitable self-adhesive polymers and their modification through adding of electrical conductive fillers. From the evaluated PSAs the best performances were achieved using acrylic PSAs. Common fillers for electrical conductivity are carbon nano-fillers, metallic powders like copper, aluminum, nickel, silver or gold. Acrylic PSA containing electrical conductivity fillers are applied for the manufacturing of diverse technical self-adhesive products, such as broadest line of electrically conductive sensitive double-sided, one-sided and carrier-free tapes. After addition of electrical conductive fillers the main typical properties for pressure-sensitive adhesives like tack and peel adhesion are deteriorated. In the last time the research and development on the area of nano carbon black or nanotubes as electrical conductive fillers is observed.     

Mechanically robust,electrically and thermally conductive graphene-based epoxy adhesives

This study develops a facile approach to fabricate adhesives consists of epoxy and cost-effective graphene platelets (GnPs). Morphology, mechanical properties, electrical and thermal conductivity, and adhesive toughness of epoxy/GnP nanocomposite were investigated. Significant improvements in mechanical properties of epoxy/GnP nanocomposites were achieved at low GnP loading of merely 0.5?vol%; for example, Young’s modulus, fracture toughness (K_1C) and energy release rate (G_1C) increased by 71%, 133% and 190%, respectively compared to neat epoxy. Percolation threshold of electrical conductivity is recorded at 0.58?vol% and thermal conductivity of 2.13?W m^?1 K^?1 at 6?vol% showing 4 folds enhancements. The lap shear strength of epoxy/GnP nanocomposite adhesive improved from 10.7?MPa for neat epoxy to 13.57?MPa at 0.375?vol% GnPs. The concluded results are superior to other composites or adhesives at similar fractions of fillers such as single-walled carbon nanotubes, multi-walled carbon nanotubes or graphene oxide. The study promises that GnPs are ideal candidate to achieve multifunctional epoxy adhesives.     

KH-CP98丙烯酸酯锚固胶粘剂的研制

植筋(锚固)胶粘剂广泛应用于建筑结构加固、改造等工程领域。合成了一种丙烯酸环氧酯预聚物L,以之为原料配制成功了KH-CP98丙烯酸酯锚固胶粘剂。探讨了反应温度、时间、物料配比对合成反应的影响,研究了单体、增韧剂、填料与胶粘剂性能的关系和胶粘剂的储存稳定性。所得锚固胶粘剂综合性能优良。     

提高环氧树脂黏钢胶机械性能的研究

研究目的在于提高建筑用环氧树脂黏钢胶的机械性能,以符合建筑行业使用的要求.通过采用自制酚醛胺为固化剂,并采用复配技术优化环氧树脂胶黏剂的组成,达到了调节胶黏剂刚性和韧性平衡的目的.考察了环氧树脂和填料的种类及用量对环氧树脂胶黏剂拉伸、弯曲和压缩强度的影响.当主树脂为E-51,添加100％比例为1:3的滑石粉与细砂复配填...     

Electrical conductivity and microwave absorbing properties of nickel‐coated multiwalled carbon nanotubes/poly(phthalazinone ether sulfone ketone)s composites

Nickel‐coated multiwalled carbon nanotubes (Ni‐MWNT) were prepared by electroless deposition with ultrasonic vibrations. The morphologies and components were characterized by scanning electron microscope and energy dispersive spectroscopy. Two types of fillers, multiwalled carbon nanotubes (MWNT) and Ni‐MWNT, were blended with poly(phthalazinone ether sulfone ketone)s (PPESK) by the solution‐mixing method, respectively. The electrical conductivity and microwave absorbing properties of the composites were investigated. The results show that Ni‐MWNT/PPESK composites have relatively lower electrical resistivity values than MWNT/PPESK, and in both cases the decrease in electrical resistivity indicates a similar percolation transition behavior in the same MWNT content region. Moreover, as MWNT loading is 5 parts per hundred parts of resin (phr), Ni‐MWNT/PPESK composite has the wider frequency region (9.5–13.5 GHz) of the reflection loss (RL) less than ?10 dB and the lower minimum value of RL (?27.5 dB) compared with MWNT/PPESK. The better microwave absorption properties can be attributed to the improved dielectric and magnetic properties of the fillers. A good correlation between electrical conductivity and microwave absorption was found for MWNT/PPESK composites. In addition, tensile test and thermogravimetric analysis indicate that introducing Ni‐MWNT into PPESK is favorable for the improvement of the mechanical properties and high temperature stability of the composites. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers     

Study on the microstructural evolution of high temperature adhesives for graphite bonding

Development of high-temperature adhesives (HTAs) can provide a way to produce carbon materials with a large size or a complex shape. Some HTAs were developed for joining graphite materials. These HTAs were prepared using phenol formaldehyde (PF) resin as matrix and B₄C powders as fillers. The results showed that these HTAs had satisfactory adhesive properties for graphite bonding even though the bonded graphite components were heat-treated at temperatures up to 1500 °C. In order to clarify the effects of the microstructure of HTAs on adhesive strength, the bonded graphite parts were heat-treated at high temperatures ranging from 400 to 1500 °C. The microstructural evolution of HTAs was investigated using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Analyses of the HTAs at the interface revealed that during microstructural evolution, carbonization of PF resin and complex interactions between PE and B₄C powders occurred. A high chemical bonding force was introduced at the interface through interactions between the glassy carbon from the PF resin and B₄C fillers, and the B₄C fillers restrained the volume shrinkage of PF resin during carbonization, which can be responsible for the good adhesive properties of HTAs for graphite bonding.     

Improving electrical and mechanical properties of a conductive nano adhesive

In this experimental study, lap shear strength and electrical conductivity of nanohybrid adhesives containing multi-walled carbon nanotubes (MWCNT) and silver (Ag) nanoparticles were investigated. Ag nanoparticles were produced via arc-discharge method in liquid nitrogen. For characterizing the Ag nanoparticles, X-ray diffraction analysis, transmission electron microscopy, and scanning electron microscopy (SEM) were performed. Tensile lap shear properties were determined in accordance with ASTM D 1002-10 standard. Mechanical and the electrical properties of nanohybrid adhesives were compared with neat epoxy adhesive. The best electrical conductivity of nanohybrid adhesive was obtained for the 1% wt MWCNT-2% wt Ag-contained sample. However, the samples which contain 0.5% wt. MWCNT–0.5% wt. Ag nanoparticles reached the highest lap shear strength. The results showed that Ag nanoparticles enhance the conductivity in the presence of MWCNT. It is concluded that the MWCNT act as conductivity bridges among epoxy adhesive and facilitate the electron transfer. As seen in the tensile test results, the ductility of the adhesive was improved by adding the nanoparticles in to the epoxy resin.     

Synergistic effect of graphene and carbon nanotube on lap shear strength and electrical conductivity of epoxy adhesives

In this study, synergy between graphene platelets (GnPs) and carbon nanotubes (CNTs) in improving lap shear strength and electrical conductivity of epoxy composite adhesives is demonstrated. Adding two-dimensional GnPs with one-dimensional CNTs into epoxy matrix helped to form global three-dimensional network of both GnPs and CNTs, which provide large contact surface area between the fillers and the matrix. This has been evidenced by comparing the mechanical properties and electrical conductivity of epoxy/GnP, epoxy/CNT, and epoxy/GnP-CNT composites. Scanning electron microscopic images of lap shear fracture surfaces of the composite adhesives showed that GnP-CNT hybrid nanofillers demonstrated better interaction to the epoxy matrix than individual GnP and CNT. The lap shear strength of epoxy/GnP-CNT composite adhesive was 89% higher than that of the neat epoxy adhesive, compared with only 44 and 30% increase in the case of epoxy/GnP and epoxy/CNT composite adhesives, respectively. Electrical percolation threshold of epoxy/GnP-CNT composite adhesive is recorded at 0.41 vol %, which is lower than epoxy/GnP composite adhesive (0.58 vol %) and epoxy/CNT composite adhesive (0.53 vol %), respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48056.     

无溶剂建筑结构胶的制备与性能

以活性增韧剂CYH-277对环氧树脂进行稀释、增韧,制备了无溶剂建筑结构胶粘剂。对活性增韧剂的结构进行了表征,考查了CYH-277对环氧树脂黏度的影响,研究了固化物的热性能,并用扫描电子显微镜(SEM)表征其形态结构,测试了制备的无溶剂建筑结构胶粘剂的力学性能。结果表明,CYH-277能够有效降低环氧树脂的黏度,调整施工性能,改善环氧树脂胶粘剂的综合性能。     

1,2-聚丁二烯/碳纳米管复合材料的制备与性能

采用哈克转矩流变仪分别将多壁碳纳米管(MWCNT)及聚合物包覆多壁碳纳米管(P-MWCNT)与1,2-聚丁二烯橡胶(1,2-PB)共混,制备1,2-PB/碳纳米管复合材料。研究了MWCNT用量对1,2-PB的硫化行为、拉伸性能和导电性能的影响及硫化胶的动态力学性能。结果表明,将MWCNT与液体聚丁二烯(PB)研磨,可使聚合物包覆在MWCNT表面,提高MWCNT在1,2-PB橡胶中的分散性,增强MWCNT与1,2-PB的界面粘合力。1,2-PB与MWCNT共混所制得的硫化胶物理性能优于1,2-PB/P-MWCNT。MWCNT能显著提高硫化胶的导电性能。