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石墨/炭黑改性树脂导电复合材料的电学性能研究[刊,中]/杨小健,何为,王守绪,等//化工新型材料,2012,40(2):91-94以改性环氧树脂为基体,石墨/炭黑为混合导电填料制备了导电复合材料。分析了材料的导电机理,研究导电填料含量与电阻率之间的关系。结果表明,当石墨为15%、炭黑     

PVDF／炭黑导电复合材料研究

研究PVDF/炭黑复合材料中炭黑种类、用量、不同种炭黑并用及非导电填料对PVDF/炭黑复合材料电学及力学性能的影响。结果表明,HG-4炭黑填充的复合材料电性能和力学性能最好;HG-4炭黑与N339炭黑并用可得到既有良好电性能和力学性能,又有较好加工性能的复合材料;氧化锌能改善导电复合材料的电性能;炭黑种类影响导电复合材料的PTC特性。     

碳系填料在聚合物基导电复合材料中的应用

介绍碳系填料在聚合物基导电复合材料中的应用以及导电复合材料渗流阈值的影响因素。碳系填料主要包括炭黑、石墨、碳纤维和碳纳米管等,对各类碳系填料的研究应侧重于提高其本征导电性能,并解决填料在聚合物基体中的分散问题。开发复合填料是拓宽碳系填料在电磁屏蔽领域应用的有效途径。采用混合填料、复合填料和多种聚合物材料并用可显著降低复合材料的电阻率,提高电磁屏蔽性能,降低导电渗流阈值。     

低阻复合型导电聚丙烯的制备研究

使用聚丙烯(PP)、热塑性弹性体(POE)、炭黑、碳纤维熔融共混制备了导电复合材料。研究了导电填料含量对材料电阻率的影响和POE含量对材料力学性能的影响。结果表明:炭黑与碳纤维的复合应用能够获得低阻导电复合材料,POE可以有效地提高材料的拉伸强度和断裂伸长率。     

三种导电填料与碳纳米管复合改性环氧树脂的研究

选取了炭黑、钛白粉和云母粉三种导电填料分别掺入10%的CNTs一同复合来改性环氧树脂的性能,结果表明,三种填料和CNTs复合后都可以显著提高复合材料抗静电的能力,而适量的炭黑复合碳纳米管和钛白粉复合碳纳米管混合物还可以起到改善环氧树脂复合材料力学性能的作用。研究表明通过多组分复合改性可以得到低成本高性能的环氧树脂材料。     

导电硅橡胶研究概况

简要介绍导电硅橡胶的导电机理、分类、电学特性以及提高硅橡胶导电性能的途径.导电硅橡胶分为金属粉末填充型和非金属粉末填充型,常用的导电填料有银粉、镰粉、镀银镍粉、石墨、炭黑、碳纳米管和导电纤维等.提高硅橡胶导电性能的途径主要有开发新型导电填料、对导电填料进行表面改性和优化加工工艺.     

抗静电PVC-U复合材料的性能研究

将炭黑或石墨作为导电填料,制备了一系列PVC-U抗静电复合材料。研究了导电填料品种与用量及加工条件对PVC-U复合材料的导电性能、加工性能及力学性能的影响。结果表明:炭黑与石墨在PVC树脂中呈连续网络状不均匀分散;当炭黑含量低时,制品既具有良好的导电性能,又具有良好的熔体流动性。     

导电复合材料的研究

以铝粉，乙炔炭黑，石墨等导电填料，不饱和聚酯树脂为基休一项玻璃纤维布为增强材料制成复合型导电复合。研究了导电填料不同种类，添加量对复合材料性能的影响。     

LDPE／炭黑导电复合材料电学及力学性能研究

研究了炭黑种类及用量、极性共聚物（Ｅ－ＡＥ－ＭＡＨ）、润滑剂种类及用量和交联剂（ＤＣＰ）对ＬＤＰＥ／炭黑导电复合材料电学及力学性能的影响。结果表明,ＨＧ－４型炭黑导电性最好,ＡＣＥＴ炭黑导电性较差。极性共聚物能提高复合材料的导电性和力学性能。高分子蜡改善复合材料电学及力学性能的效果优于液体石蜡。交联剂使复合材料导电性变差,但力学性能提高     

不饱和聚酯树脂基复合材料的导电性能

以石墨、碳纤维、镍粉和不饱和聚酯树脂为原料通过模压成形固化制备导电复合材料,研究不同比例导电填料及用量、加工工艺对复合材料性能的影响.结果表明:导电填料比例和含量对复合材料的电导率与弯曲性能影响显著,一定含量下的镍粉和碳纤维,可以明显改善体系的强度,同时有助于降低材料的体积电阻率.加入适量丙酮溶剂作为稀释剂,提高了导电填料的分散和浸润,材料的导电性和弯曲性能明显提高.     

抗静电木粉/聚丙烯复合材料的研究

为了提高木粉/聚丙烯复合材料的抗静电性能,通过高速混合、挤出造粒以及热压成型的方式制备了4种抗静电木粉/聚丙烯复合材料,并比较了它们的体积电阻率和拉伸强度,结果表明:在4种抗静电复合材料中加入炭黑的复合材料体积电阻率最小,拉伸强度最大。探讨了炭黑用量对木粉/聚丙烯复合材料抗静电性能和力学性能的影响,结果表明:当炭黑用量增加时,复合材料的体积电阻率明显降低,拉伸强度和弯曲强度出现最大值,弹性模量和断裂伸长率呈下降趋势。     

炭黑对ASA/天然石墨复合材料的电磁屏蔽性能影响

通过熔融共混方法制备导电高分子复合材料丙烯腈-苯乙烯-丙烯酸酯共聚物(ASA)/天然石墨(NGR)/炭黑(CB),采用电磁屏蔽测量仪、四探针电阻率测量仪和动态热机械分析仪对复合材料的电性能和力学性能进行详细研究。结果表明,ASA/NGR复合材料的体积电阻率随着炭黑含量增加而增加;同时在30 MHz~1500 MHz范围内,复合材料的电磁屏蔽性能从28 dB提高到38 dB,符合商业要求。炭黑的加入大大改善了材料力学性能,弯曲强度从31 MPa增加到41 MPa;动态储能模量从4.6 GPa增加到14.5 GPa。     

Synergistic effects of carbon fillers on tensile and flexural properties in liquid‐crystal polymer based resins

One emerging market for thermally and electrically conductive resins is bipolar plates for use in fuel cells. Adding carbon fillers to thermoplastic resins increases the composite thermal and electrical conductivity. These fillers have an effect on the composite tensile and flexural properties, which are also important for bipolar plates. In this study, various amounts of three different types of carbon (carbon black, synthetic graphite particles, and carbon fibers) were added to Vectra A950RX liquid‐crystal polymer. In addition, composites containing combinations of fillers were also investigated via a factorial design. The tensile and flexural properties of the resulting composites were then measured. The objective of this study was to determine the effects and interactions of each filler with respect to the tensile and flexural properties. The addition of carbon black caused the tensile and flexural properties to decrease. Adding synthetic graphite particles caused the tensile and flexural modulus to increase. The addition of carbon fiber caused the tensile and flexural modulus and ultimate flexural strength to increase. In many cases, combining two different fillers caused a statistically significant effect on composite tensile and flexural properties at the 95% confidence level. For example, when 40 wt % synthetic graphite particles and 4 wt % carbon black were combined, the composite ultimate tensile and flexural strength increased more than what would be expected from the individual additive effect of each single filler. It is possible that linkages were formed between the carbon black and synthetic graphite particles that resulted in improved ultimate tensile and flexural strength. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

科琴黑对聚乙烯/氢氧化铝材料热稳定性和阻燃性能的影响

将具有独特支链状的科琴黑(KB)与聚乙烯(PE)和氢氧化铝(ATH)通过熔融共混的加工方式得到聚乙烯/氢氧化铝/科琴黑复合材料,并对复合材料的热稳定性、阻燃性能和力学性能进行研究。科琴黑的加入提高了复合材料的初始分解温度,降低了复合材料的热释放速率,延缓了聚乙烯的燃烧过程。在提高复合材料热稳定性能和阻燃性能的同时,科琴黑同时还提高了材料的拉伸性能。     

Effects of carbon fillers on tensile and flexural properties in polypropylene‐based resins

A potential application for conductive resins is in bipolar plates for use in fuel cells. The addition of carbon filler can increase the electrical and thermal conductivities of the polymer matrix but will also have an effect on the tensile and flexural properties, important for bipolar plates. In this research, three different types of carbon (carbon black, synthetic graphite, and carbon nanotubes) were added to polypropylene and the effects of these single fillers on the flexural and tensile properties were measured. All three carbon fillers caused an increase in the tensile and flexural modulus of the composite. The ultimate tensile and flexural strengths decreased with the addition of carbon black and synthetic graphite, but increased for carbon nanotubes/polypropylene composites due to the difference in the aspect ratio of this filler compared to carbon black and synthetic graphite. Finally, it was found that the Nielsen model gave the best prediction of the tensile modulus for the polypropylene based composites. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Electrical and thermal conductivity and tensile and flexural properties of carbon nanotube/polycarbonate resins

Adding conductive carbon fillers to insulating thermoplastic polymers increases the resulting composite's electrical conductivity. Carbon nanotubes (CNTs) are very effective at increasing composite electrical conductivity at low loading levels without compromising composite tensile and flexural properties. In this study, varying amounts (2–8 wt %) of CNTs were added to polycarbonate (PC) by melt compounding, and the resulting composites were tested for electrical conductivity (1/electrical resistivity), thermal conductivity, and tensile and flexural properties. The percolation threshold was less than 1.4 vol % CNT, likely because of CNTs high aspect ratio (1000). The addition of CNT to PC increased the composite electrical and thermal conductivity and tensile and flexural modulus. The 6 wt % (4.2 vol %) CNT in PC resin had a good combination of properties for electrical conductivity applications. The electrical resistivity and thermal conductivity were 18 Ω‐cm and 0.28 W/m · K, respectively. The tensile modulus, ultimate tensile strength (UTS), and strain at UTS were 2.7 GPa, 56 MPa, and 2.8%, respectively. The flexural modulus, ultimate flexural strength, and strain at ultimate flexural strength were 3.6 GPa, 125 MPa, and 5.5%, respectively. Ductile tensile behavior is noted in pure PC and in samples containing up to 6 wt % CNT. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Reinforcement of polymethyl methacrylate with silane-treated zinc oxide nanoparticles: fire retardancy,electrical and mechanical properties

Polymethyl methacrylate (PMMA)/zinc oxide (ZnO) composites were prepared using melt mixing process. A nano ZnO-treated with aminopropyl triethoxysilane (APTS) was used as reinforcing particles. PMMA composites were obtained with different ZnO loadings of 0, 0.5, 1 and 2 parts by weight. This research was focused on determination of the influence of different loadings of silane-treated ZnO particles on the morphology, electrical, mechanical and flammable properties of the PMMA composites. Addition of ZnO to the PMMA composite was observed to enhance the thermal properties and char formation. The results from cone calorimeter showed 21% reduction in the peak heat release rate for the composite loaded with 1.5 wt% of ZnO as compared to that of neat PMMA. The surface resistivity, volume resistivity and EMI shielding properties of the composites as a function of ZnO loading were estimated. The results showed that the surface and volume resistivity of the composites reinforced with ZnO particles decreased and the EMI shielding increased almost linearly with increasing ZnO volume content. However, the tensile strength of the composites showed a slight decrease with increase in ZnO content. The SEM micrographs and AFM images showed dispersion of ZnO particles in the PMMA matrix. The nanoparticles were distributed evenly on the surface. Nevertheless the pockets of agglomerates could be seen at higher ZnO loading level.     

Synthesis,mechanical property,and thermal stability of reduced graphene oxide–zinc oxide/cyanate ester/bismaleimide resin composites

Reduced graphene oxide–zinc oxide/cyanate ester/bismaleimide resin (RGO–ZnO/CE/BMI) composites were synthesized via a blending method. The RGO–ZnO composite was incorporated into the CE/BMI copolymer to improve the properties of RGO–ZnO/CE/BMI composites. The structure, elements, and morphology of the RGO–ZnO composite were studied with XPS, FTIR, XRD, and SEM analyses. It indicated that the ZnO micro-sphere was attached to RGO by electrostatic attraction and the RGO–ZnO composite was prepared successfully. The mechanical properties and thermal stability of RGO–ZnO/CE/BMI composites were investigated. When RGO–ZnO composite was 1 wt.%, the flexural and impact strengths of RGO–ZnO/CE/BMI composites were 1.07 and 1.35 times of the CE/BMI copolymer, respectively. However, the RGO–ZnO composite tended to aggregate in the CE/BMI matrix with high loading. According to the SEM analysis, appropriate RGO–ZnO composite was evenly dispersed in the CE/BMI copolymer. Compared to the CE/BMI copolymer, the thermal stability of the RGO–ZnO/CE/BMI composites was good. Thus, the RGO–ZnO composite was successfully filled in the CE/BMI matrix; the mechanical properties and thermal stability of the RGO–ZnO/CE/BMI composites were enhanced.     

Mechanical and thermal properties of talc and calcium carbonate filled polypropylene hybrid composites

The main aim of this work was to study and compare the mechanical and thermal properties of hybrid polypropylene (PP) composites and single‐filler PP composites. With two main types of mineral fillers—calcium carbonate (CaCO₃) and talc—PP composites of different filler weight ratios (talc/CaCO₃) were compounded with a twin‐screw extruder and then injection‐molded into dumbbell specimens with an injection‐molding machine. Tensile, flexural, and impact tests were performed to determine and compare the mechanical properties of the hybrid and single‐filler PP composites. A synergistic hybridization effect was successfully achieved; the flexural strength and impact strength were highest among the hybrids when the PP/talc/CaCO₃ weight ratio was 70:15:15. The nucleating ability of the fillers and its effects on the mechanical properties were also studied with differential scanning calorimetry. Because of the influence of talc as the main nucleating agent, the hybrid fillers showed significant improvements in terms of the nucleating ability, and this contributed to the increase in or retention of the mechanical properties of the hybrid composites. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3327–3336, 2004     

铜对碳纤维/酚醛树脂受电弓滑板材料的性能影响

采用热压烧结法制备了碳纤维织物/酚醛树脂(PE)受电弓滑板复合材料,研究了Cu对碳纤维织物/PE受电弓滑板复合材料的电阻率、密度和力学性能的影响。采用万能材料试验机、电阻测试仪测试了复合材料的力学性能和电学性能,用金相显微镜、扫描电子显微镜(SEM)分析测试手段对材料的组成结构及断口微观形貌等进行了测试和表征。结果表明,铜粉经高温烧结后呈连续三维网状结构,这种结构与碳纤维织物协调作用,阻止裂纹扩展,提高了复合材料的力学性能;当铜含量为40%时,复合滑板材料的综合性能最优:电阻率降至22.1μΩ.m;弯曲强度和压缩强度分别提高至61.8MPa和29.6MPa;冲击韧性达到12.7 J/cm3。