加工工艺对高分子基PTC自限温电热丝性能的影响

研究了乙炔炭黑填充LDPE智能型电热丝的挤出加工工艺参数，及热处理与辐照交联等后加工手段对高分子基PTC自限温电热丝导电性能的影响。结果发现，电热丝挤出口模温度、螺杆转速(或牵引速度)、护套挤出方式及护套厚度、护套材料性能对PTC自限温电热丝性能有很大影响；热处理、辐照工艺与通电时间次序对智能PTC导电材料的电阻率亦有影响。     

陶瓷电热材料的研究与应用

本文分析了金属电热丝、电热膜、电热涂料等电热材料,重点介绍了四种陶瓷电热材料各自的研究历史、主要制备方法、电热性能方面的研究,并对各电热材料的发展进行了展望。     

ATO电热膜的制备研究现状

简单介绍了ATO电热膜的导电机理和电学性能,总结分析其国内外制备研究现状,对各种制备方法的原理、特点加以评述,并对电热膜的发展前景进行了展望。     

基于石墨烯的水性电热涂料的制备与性能研究

介绍了一种基于石墨烯的水性电热涂料的制备方法,对影响涂膜导电性能稳定性的因素进行了分析,并制备了可在36 V安全电压下快速升温的水性电热涂料与电热膜。     

一种新型碳纤维复合电热膜及其制备方法

正本发明公开了一种新型碳纤维复合电热膜,包括导电碳纤维层,所述导电碳纤维层为碳纤维编织成的网状结构层且其两端连接有金属电极,所述导电碳纤维层整体被绝缘导热塑料膜包覆成片状结构。本发明所提供的碳纤维电热膜可耐高温、不易氧化,其外层导热塑料为绝缘材料,可耐300℃高温,耐高压,所以安全性极高,并且可     

硫化机电加热装置

一种硫化机电加热装置，采用面状整体发热的电热膜作为发热元件，在电热膜的一面或两面有传热件，由于电热膜大面积的均匀热场和热惯性小，且电热膜和传热件在全面积上无间隙地紧密接触，因此热效率较高、升温较快、传热件表面温差小。传热件不需钻制细长孔和焊接蒸汽通道，故结构比较简单、加工比较容易。刘轮胎硫化机用电热板取代蒸汽热扳，则轮胎厂可以将原来的大功率锅炉改为小功率锅炉和取消绝大部份的供汽管网，从而将污染源大量减少并获得很大的节能效益。     

以KCNS为络合剂的镀硬银工艺

介绍了一种以硫氰酸钾为络合剂的低氰镀硬银工艺。在不影响镀层结合力，焊接性能和导电性能的情况下能较普通镀银工艺提高镀层硬度２倍以上，是一种具有实用价值的镀硬银工艺。     

导电胶粘剂

微小的导电颗粒(如银等)分散在不同的树脂里所制成的胶粘剂,称为导电胶,它用于电器和电子工业。过去在需要接通电路的地方,用焊料焊接。但由于它需要高温加热,有时会损伤元器件;它也难于做到使用极少量焊料或极准确地焊接。导电胶粘剂则是比焊接较理想的联接方法。它不仅可以代替焊接,而且已成为导电涂料,利用它对很多种材料的良好粘接性能,印刷于各种不同     

新型电热膜银电极的研制

本文通过对比三种不同方法所制电热膜银电极的性能 ,得到最佳制备工艺并成功制得电热膜银电极。通过将该电热膜银电极应用于定向加热器发现 ,与普通电加热器性能相比较 ,该银电极电热膜加热器的全波长比辐射率高 ,热辐射转化率高 ,热效率高 ,能显著节约能源 ,而且具有较高的热稳定性。     

2005年塑料新材料、新应用进展之一

无铅焊接聚合物美国RTP公司开发出一系列通用型热塑性复合物,该类复合材料能够承受电子装配行业中无铅焊接的更高温度,利用增强和添加技术改性使之满足WEEE和RoHS的无铅协定。对于该公司来说,开发出无铅焊接复合物首要挑战是该材料必须满足无铅焊接过程中的耐高温。这种材料跟无铅焊接合金相接触的部分要求必须耐260℃以上的高温。因而高温热塑性技术成为材料设计的关键因素,如电容器的罩子和电位计等的连接器以及水平板部分,其热塑性材料的要求尤其高。设计一种理想的材料要考虑各种因素,该材料如果导电性能太强会很耗电;如果导电性能…     

导电高分子材料研究进展

综述导电高分子材料的发展及应用。介绍导电高分子材料的分类,复合型及结构型导电高分子材料的导电机理,以及它们在膜分离技术、微波焊接、防腐、电致变色器件等方面的应用。并指出了导电高分子材料目前的研究趋势。     

Improvement of adhesion and continuity of polypyrrole thin films through surface modification of hydrophobic substrates

Conducting polymer polypyrrole is reported to have a poor adhesion to substrate which limits its applicability as thin films. In this article, we report synthesis of well‐formed and continuous film of polypyrrole through treatment of hydrophobic substrates. However, in place of the widely used organosilanes, the substrates were simply treated with surfactant cetyl trimethylammonium bromide (CTAB) prior to vapor phase polymerization under controlled environment. Polypyrrole films formed on CTAB pretreated substrates were found to have improved adhesion and continuity compared to the films formed on untreated substrates. The improved adhesion results in better electronic properties as seen during Electron field emission studies. Based on contact angle analysis, we propose that CTAB molecules act as anchoring agents for the oxidant layer on the substrate and hence assist in the deposition of a more continuous polypyrrole film. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39771.     

Preparation and electroanalytical characterization of polyaniline: Polyacrylonitrile composite films

Electrically conducting composite films of polyaniline:polyacyrlonitrile (PANI:PAN) prepared with varying composition ratios of aniline mixed with a fixed amount PAN. The films of optimum thicknesses (0.10 mm) were obtained using an electrically operated automatic pressure machine. The films polymerized by oxidative polymerization using 0.1M potassium persulphate (K₂S₂O₈), undoped in 1M aqueous ammonia (NH₄OH) and doped in 1M hydrochloric acid (HCl). The conductivity of composite films was studied by keeping it in 1M HCl for different time period using 4-in-line probe DC electrical conductivity measuring instrument and the temperature dependence of DC electrical conductivity was studied using isothermal technique. The PANI:PAN composite film is used as a working electrode in an electrochemical cell. Chemically doped composite film is used as cathode (working electrode), aluminum metal foil as anode (counter electrode) and platinum foil as reference electrode. The electrolyte is of 0.05M aluminum chloride (AlCl₃) in dimethyl sulfoxide (DMSO). The voltage of the working electrode is stabilized with respect to the reference electrode and current applied between the working and counter electrode through a 9-V battery. The change in voltage versus time is plotted as the discharge curve and reversing the cell processes results in the doping of the composite films. The diffusion coefficient of the dopant ion (Cl⁻) present in the fully doped films were estimated by the galvanostatic pulse technique and found to bedifferent in different samples in the range of 10⁻¹⁶ to 10⁻¹² cm² s⁻¹. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Effect of the grain size of nanoparticle dye‐coated titanium dioxide on the short‐circuit current density and open‐circuit voltage of an indium tin oxide/titanium dioxide/poly(acrylonitrile)–propylene carbonate–lithium perchlorate/graphite solar cell

A dye‐sensitized indium tin oxide (ITO)/titanium dioxide (TiO₂)/polyacrylonitrile (PAN)–propylene carbonate (PC)–lithium perchlorate (LiClO₄)/graphite solar cell was fabricated, and its performance was tested in the dark and under the illumination of a 100 mW/cm² light. Three TiO₂ samples were used in the device, namely, uncoated TiO₂, a TiO₂ film coated with methyl red dye, and a TiO₂ film coated with coumarin dye. The films were deposited onto an ITO‐covered glass substrate by a controlled hydrolysis technique assisted with a spin‐coating technique. The films were characterized by scanning electron microscopy to determine their average grain size. The smallest grain size (48 nm) was obtained for the uncoated film. An electrolyte of PAN–LiClO₄ with PC plasticizer was prepared by a solution‐casting technique. A graphite electrode was prepared on a glass slide by an electron‐beam evaporation technique. The device showed rectification properties in the dark and showed a photovoltaic effect under illumination. The device with the uncoated TiO₂ film showed the highest short‐circuit current density (2.0 μA/cm²) and an open‐circuit voltage of 0.64 V because it possessed the smallest grain size. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

导热绝缘聚合物复合材料研究

介绍了导热绝缘聚合物复合材料,包括复合型塑料、橡胶、胶粘剂和涂层的研究进展及其导热机理、导热模型的研究情况。讨论了影响导热绝缘聚合物复合材料导热性能的因素、提高导热系数的措施及该种复合材料的制备方法,最后阐述了导热绝缘聚合物复合材料的应用及发展方向。     

Electrochemical synthesis and characterization of poly (o-amino benzyl alcohol) and poly (o-amino benzyl alcohol-co-o-anisidine)

In this study; poly (o-amino benzyl alcohol) and poly (o-amino benzyl alcohol-co-o-anisidine) copolymer films were electrochemically synthesized by cyclic voltammetry technique on the platinum electrode. The synthesis of copolymer films was achieved in various monomers feed ratio (o-amino benzyl alcohol: o-anisidine; 8:2, 1:1, 2:8) of o-amino benzyl alcohol and o-anisidine. Different solution types were tested in aqueous and non-aqueous media, especially during the synthesis process, as the electrolyte medium. As a result of the experiments, it was determined that sulfuric acid solution was the most suitable solution for both homopolymer and copolymer film growth. Homopolymer and copolymer samples were characterized by FT-IR, cyclic voltammetry (CV), SEM, digital images and TGA/DTA techniques. The CV, SEM and digital images results indicated that the solution which has high ratio of monomer is more effective in copolymer film synthesis mechanism. TGA results showed that the 1:1 copolymer film had higher thermal stability than the films at other monomer ratios. Also, electrochemical studies exhibited that the copolymer film in 1:1 ratio is partially more electrochemically stable than other copolymer films.     

Environmental stability of electrically conductive viologen–polyaniline systems

Viologen–polyaniline (PANI) systems were prepared by PANI being coated onto viologen‐grafted low‐density polyethylene films. PANI in this system could undergo photoinduced doping with ultraviolet irradiation. The electrical stability of the electrically conductive viologen–PANI systems was found to be stable in air, but the conductivity decreased rapidly when the sample was treated in aqueous media of pH > 5 because of the migration of the anions out of PANI into water. However, the conductivity increased by a factor of 2 after treatment in a 1M HCl solution because of the further protonation of PANI by acid. The structural changes of these systems were monitored with ultraviolet–visible absorption spectroscopy, Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, and resistance measurements. The electrical stability of the viologen–PANI system in water could be enhanced via spin coating with poly(methyl methacrylate) (PMMA) because this layer inhibited the migration of the anions out of the system. The photoinduced doping of PANI could be carried out either before or after the spin coating of PMMA. The advantages and limitations of each method were demonstrated. A PMMA coating with a thickness of approximately 10 μm allowed a significant doping level to be achieved within a short period of irradiation and, at the same time, effectively shielded the film from the effects of the aqueous medium. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2099–2107, 2002     

Synthesis of a graphene nanosheet film with attached amorphous carbon nanoparticles by their simultaneous electrodeposition

Amorphous carbon nanoparticles (a-CNPs) on a graphene nanosheet (GNS) film, deposited on a silicon substrate, were synthesized using simultaneous electrodeposition from a methanol suspension of polydiallyldimethylammonium chloride-modified GNSs. The a-CNPs are homogeneously deposited on the surfaces of the GNSs, forming a dense electrically conductive a-CNP/GNS composite film with good adhesion to the substrate. Such simple and low-cost simultaneous electrodeposition technique makes the a-CNP/GNS composite film attractive for various applications, such as electrodes, capacitors, batteries and field emitters.     

聚酯薄膜的电晕处理及其应用

讨论了聚酯薄膜电晕处理及其应用的关系,指出在一些应用范围电晕处理的必要性。简介了电晕处理的原理、工艺和要求,表明：为提高聚酯薄膜的印刷、粘合和真空镀金属（铝等）的效果,表面张力应达到52mN／m以上,且贮存2年内仍然保持不变。     

Electrical resistivity and thermal conductivity properties of graphene-coated woven fabrics

In this study, it was aimed to develop electrically and thermal conductive textiles surfaces. Pretreated polyester fabrics were coated with nano graphene powders at different concentration rates (50, 100, and 200 g/kg) by knife over roll technique. Electrical resistivity, thermal conductivity, thickness and mass per unit area measurements, bending rigidity, and abrasion resistance tests of coated fabrics were performed. Surface resistivity measurements of coated fabrics were made according to ASTM D 257 standard with Keithley 8009 Resistivity Test Fixture. Surface electrical resistivity values of coated fabrics decreased with increasing concentration rates. Of note, 2.53 × 10⁴ Ω/sq surface resistivity value was obtained at 200 g/kg graphene concentration rate. Thermal conductivity measurements of coated fabrics were made according to JIS R 2618 standard with Quick Thermal Conductivity Meter (QTM-710). Thermal conductivity property of fabrics improved depending on graphene concentration. The highest thermal conductivity value (0.4243 W/mK) was obtained at 200 g/kg graphene concentration rate. One of the most important results of the study was that a maximum weight loss of 0.40% was observed in the abrasion resistance test even after 100 000 cycles. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48024.