芳烃油和环烷油对中乙烯基聚丁二烯橡胶性能的影响

研究了不同份数芳烃油及环烷油对中乙烯基聚丁二烯橡胶性能的影响。研究结果表明,随着操作油的份数增大,正硫化时间延长,加入40份炭黑、10份油时胶料的综合性能最好,填充相同份数芳烃油比填充相同份数环烷油胶料的物理性能稍好。     

华光导电炭黑填充胶料的负温度系数（NTC）效应

研究以华光导电炭黑填充天然橡胶和氯丁橡胶胶料的电阻率随温度变化的规律,试验结果表明：两种炭黑填充的胶料均具有ＮＴＣ效应;以华光ＨＧ－Ⅱ导电炭黑最为明显,且当用量小于２０Ｐｈｒ时,胶料的电阻率对温度较敏感。     

硫化体系对导电炭黑填充NBR胶料性能的影响

研究普通硫化(CV)体系和有效硫化(EV)体系对导电炭黑填充NBR胶料性能的影响.结果表明.当导电炭黑用昔相同时,导电炭黑在CV体系胶料中的分散性优于EV体系胶料;CV体系胶料的硬度、拉伸强度、撕裂强度及体积电阻率均小于EV体系胶料,电磁屏蔽效能高于EV体系胶料.     

不同用量和种类炭黑对热塑性聚烯烃弹性体胶料性能的影响

研究不同用量和不同种类炭黑(导电炭黑CSX946和VXC72以及炭黑N550)填充热塑性聚烯烃弹性体(POE)胶料的导电性能和物理性能.结果表明:在试验的炭黑用量范围(30～80份)内,随着导电炭黑CSX946用量的增大,POE胶料的体积电阻率降低,邵尔A型硬度和100％定伸应力增大,拉伸强度和拉断伸长率呈减小趋势,当...     

不同裂解温度对废旧轮胎裂解炭黑性能的影响

研究不同裂解温度下废旧轮胎裂解炭黑的性质及其在天然橡胶中的应用,并与炭黑N330和炭黑N660进行对比。结果表明：与炭黑N330和炭黑N660相比,裂解炭黑的吸碘值大,结构度偏低,灰分含量偏高;裂解温度越高,裂解炭黑的理化性能越好;裂解炭黑填充胶料的门尼粘度比炭黑N330填充胶料略高,t90缩短;裂解炭黑填充胶料的拉伸强度与炭黑N660填充胶料相当,略小于炭黑N330填充胶料;对比3种裂解炭黑,裂解炭黑S1填充胶料的拉伸强度最大,裂解炭黑S3填充胶料的300%定伸应力最大;在相同应变范围内,裂解炭黑S3填充胶料的损耗因子较小,生热较低。     

炭黑填充轮胎胎面胶热扩散系数的实验研究

利用激光导热仪测定了5种填充不同质量份N220炭黑的胶料在温度范围为30℃～140℃时的热扩散系数，实验的误差小于3％．测得的数据完全能满足工程应用的需要。分析数据发现，胶料的热扩散系数均随温度的增加而减小，随炭黑填充量的增加而增大，同时把热扩散系数与温度和炭黑填充质量份数进行了关联，导出了一个计算热扩散系数的多项式，此公式中既包含温度又包含炭黑质量份数。因此可利用此方程式计算文中胶料的热扩散系数。把该方程的计算值与实验值进行比较，发现60个数据点的总平均相对误差为0．53％，结果满意。     

不同炭黑对溶聚丁苯橡胶性能的影响

研究不同炭黑对溶聚丁苯橡胶(SSBR)性能的影响。结果表明:在密炼(一段混炼)过程中炭黑N330填充SSBR胶料的温度和功率均较高,不同炭黑填充SSBR胶料的粘-切依赖性大致相同;炭黑粒径越小、结构度越高,其填充SSBR胶料的Payne效应越显著;炭黑SP5000填充SSBR胶料的焦烧时间最长,炭黑N115,N234,N330和N550填充SSBR胶料的硫化速率稍快;粒径较小的炭黑填充SSBR硫化胶的物理性能和耐磨性能较优,但压缩温升较高;粒径相近而结构度较高的炭黑填充SSBR硫化胶的物理性能优于结构度较低的炭黑填充硫化胶;粒径较大的炭黑填充SSBR硫化胶的抗湿滑性能较好和滚动阻力较低,炭黑N774填充SSBR硫化胶的抗湿滑性能最好,且滚动阻力最低。     

炭黑对IIR1751性能影响的研究

考察了不同炭黑对IIR1751橡胶硫化特性、交联密度、力学性能及动态力学性能的影响,并分析了炭黑在相应胶料中的分散状况。结果表明,随着炭黑比表面积的增大,IIR1751混炼胶门尼粘度增大,炭黑N375填充的胶料焦烧时间最长;粒径太小或结构度太高的炭黑均不利于在其混炼胶中分散,但炭黑N330在其混炼胶中分散性最好;炭黑N220填充的胶料交联密度最大;不同炭黑填充的IIR1751硫化胶tanδ峰值,ΔG′,G″有明显差别;炭黑N220,炭黑N347和炭黑N375填充的硫化胶永久变形较大,炭黑N330填充的胶料各项力学性能比较均衡。     

EPDM橡胶力学性能及海水防渗性能研究

本文对填充不同份数聚乙烯醇纤维(PVA)和不同牌号炭黑的三元乙丙橡胶(EPDM)力学性能进行了研究,并模拟海洋环境,对EPDM进行加速老化实验,测定其溶胀度,探究胶料的海水防渗性能,为航海、石油化工等行业用橡胶提供参考。研究发现,填充10份PVA纤维后,随着PVA纤维份数的增加,胶料拉伸强度逐渐减小,撕裂强度逐渐增加,小应变条件下模量逐渐增大,大应变条件下模量逐渐减小。炭黑N330、N550、N660的粒径逐渐增大,炭黑比表面积逐渐减小,硫化胶硬度越大,橡胶拉伸强度变小,硫化胶的100%定伸应力与300%定伸应力逐渐减小。     

华光导电炭黑填充硅橡胶的研究

研究了华光导电炭黑填充硅橡胶的工艺性能、导电性能及物理机械性能。实验表明：在不添加软化剂的情况下，华光导电炭黑在硅橡胶中的填充量应小于30phr；在硅橡胶中填充20phr时，加工性能和综合性能较好，表面电阻率为23Ω·cm，体积电阻率为100～101Ω·cm，拉伸强度则可达5．7MPa，可见，华光导电炭黑在较低填充份数下，硫化胶的电阻率较低，而拉伸强度较高，极具有应用前景。     

原位聚合ZDMA与炭黑并用补强POE的研究

研究了原位聚合甲基丙烯酸锌(ZDMA)与炭黑并用以及体系的填充量、ZDMA理论生成量、ZnO/MMA摩尔比对聚烯烃弹性体(POE)硫化胶性能的影响.结果表明,加入炭黑改善了胶料的拉伸永久变形,当ZDMA与炭黑的用量为50～60份时,填料分散好,对胶料的补强效果显著.ZDMA理论用量为30～40份、ZnO/MMA摩尔比为0.75左右时,胶料的综合力学性能最好.     

炭黑填充聚乙烯导电复合材料的性能研究

研究了炭黑填充聚乙烯导电复合材料的性能及增容剂对其性能的影响。结果表明,炭黑填充聚乙烯导电复合材料具有明显的渗滤效应,当炭黑含量为12%时,复合材料具有较好的导电性能;增容剂(乙烯/辛烯)共聚物(POE)和马来酸酐接枝聚乙烯(PE-g-MAH)的加入对复合材料的导电性能没有造成太大的影响,却较好地改善了其冲击强度,加入POE还能有效地改善复合材料的加工性能,并在一定用量范围内提高其热变形温度。     

导电炭黑/杜仲胶复合材料电磁屏蔽性能的研究

采用机械共混法制备了导电炭黑/杜仲胶复合材料,研究炭黑用量对复合材料电性能和电磁屏蔽性能的影响。结果表明：随着炭黑用量的增加,复合材料的导电率增大,当炭黑用量为25份时,导电率达到3.3S/cm,导电率遵循导电逾渗规律;复合材料的Payne效应越来越大,有利于形成稳定的导电网络;复合材料的拉伸强度逐渐增大后略微降低,断裂伸长率先增加后逐渐下降。复合材料的屏蔽效能增大,当炭黑用量为20份时,屏蔽效能最高能达到33.2dB,可以满足一般工业或者商业用电子设备的要求。     

动态硫化EPDM／PoE热塑性弹性体补强体系的研究

采用动态硫化法制备了EPDM／POE热塑性弹性体（TPV）。研究了炭黑、白炭黑和经si69预处理的白炭黑对TPV性能的影响。结果表明,经Si-69预处理的自炭黑补强的TPV力学性能和热性能,明显高于普通白炭黑。3种补强对比,炭黑N330补强效果最好,当炭黑用量为30份时,综合力学性能最佳,且此时炭黑在体系中的分散性也较好。     

炭黑用量对硅橡胶基力敏复合材料性能的影响

以炭黑为导电功能填料制备炭黑/甲基乙烯基硅橡胶(MVQ)力敏复合材料,研究炭黑用量对复合材料硫化特性、拉伸性能、压缩应力松弛性能、电性能和压阻性能的影响.结果表明:炭黑用量为11～16份时,炭黑/MVQ复合材料电性能达到逾渗阈值.随着炭黑用量的增大,炭黑/MVQ复合材料拉伸强度先增大后减小,最后趋于稳定,而压缩松弛率呈减小趋势.炭黑用量为11份时炭黑/MVQ复合材料的压阻重复性较好.适宜的炭黑用量为10～12份.     

Preparation of graphite composite bipolar plate for PEMFC

This research studied the preparation of graphite composite using liquid thermosetting plastic such as polyester resin (POE), phenolic modified alkyd resin (PhA) and mixed resin (POE with 10% PhA) as a binder. The morphology, physical, electrical and mechanical properties of the graphite composites were analyzed. The results showed that POE could combine with graphite powder (the 66% wt. saturated of graphite powder) better than PhA and mixed resin and gave higher electrical conductivity (4.52 S/cm). It was also found that epoxy resin could improve the mechanical property of composite plate. The addition of TiO₂ and ZnSt slightly decreased the electrical conductivity and the water absorption. Moreover, it was proposed that TiO₂ could improve the mechanical property. Carbon fiber can increase electrical and mechanical properties and water absorption of the composite with POE as a binder. The mixing of wet-lay mixture with graphite, carbon fiber and POE composite improved the mechanical property and decreased the water absorption.     

2种导电炭黑复合橡胶体系的导热性能研究

研究了2种导电炭黑复合天然橡胶材料的导热性能随着温度和填料用量的变化规律。结果表明,温度对于导电炭黑复合体系导热性能的影响不大。乙炔黑复合体系具有极高的导热性能,随着炭黑用量的增加,其导热性能优势越加明显。据透射电镜观察填料的微观形态,乙炔黑链枝状结构丰富,聚集体之间以面接触为主,这是其复合橡胶导热性能优异的原因,乙炔黑复合材料的热导率与炭黑体积分数呈线性关系。40B2复合体系的热导率与炭黑体积分数呈现逾渗规律,逾渗阈值在炭黑体积分数8.30%至13.63%之间。据扫描电镜观察复合材料的微观结构,逾渗现象与炭黑在基体内的分布密切相关。为更精确地描述填料用量与复合体系热导率的关系,对2种复合体系的热导率与炭黑的体积分数进行了回归。     

Effect of rubber matrix type on the morphology and reinforcement effects in carbon black‐nanoclay hybrid composites—A comparative assessment

Carbon black (B)–nanoclay (NC) hybrid composites, based on millable polyurethane and brominated isoprene isobutylene rubber (BIIR), were prepared. The carbon black loading was fixed at 20 phr and organically modified sodium montmorillonite clay loading varied from 5 to 20 phr in each rubber compounds. The nanocomposites were prepared in laboratory by mixing two‐roll mill. The state of dispersion of the layered silicate was studied by X‐ray diffraction (XRD) and transmission electron microscopy (TEM). XRD and TEM results indicated intercalation of PU and BIIR into the silicate interlayers, followed by exfoliation of the silicate layers into the elastomer matrices. However, the level of intercalation and exfoliation varied considerably with the type of elastomer. The reinforcing effects obtained were found to depend strongly on the extent and degree of the dispersion of the carbon black and silicate layers into the rubber matrices. Mechanical and dynamic mechanical properties were evaluated for each composite. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers     

Effect of some service conditions on the electrical resistivity of conductive styrene–butadiene rubber–carbon black composites

Conductive polymer composites were prepared using vulcanized styrene–butadiene rubber as a matrix and conductive carbon black as a filler. The filler loading was varied from 10 to 60 phr. The volume resistivity was measured against the loading of the carbon black to verify the percolation limit. The electrical conductivity of filled polymer composites is attributed to the formation of some continuous conductive networks in the polymer matrix. These conductive networks involve specific arrangements of conductive elements (carbon black aggregates) so that the electrical paths are formed for free movement of electrons. The effects of temperature and pressure on the volume resistivity of the composites were studied. The volume resistivity of all the composites increased with increase in temperature, and the rate of increase in the resistivity against temperature depended on the loading of carbon black. The change in volume resistivity during the heating and cooling cycle did not follow the same route, leading to the phenomena of electrical hysteresis and electrical set. It was found that the composites with 40 and 60 phr carbon black become more conductive after undergoing the heat treatment. Generally, all the composites showed a positive temperature coefficient of resistivity. The volume resistivity of all the composites decreased with increase in pressure. The relaxation characteristic of the volume resistivity of the composites was studied with respect to time under a constant load. It was found that the volume resistivity of the compressed specimen of the composites decreased exponentially with time. It was observed that initially a faster relaxation process and later a slower relaxation process occurred in these composites. Some mechanical properties of these composites were also measured to confirm the efficacy of these composites for practical applications. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2179–2188, 2004     

Surface‐modified MgO nanoparticle enhances the mechanical and direct‐current electrical characteristics of polypropylene/polyolefin elastomer nanodielectrics

Polypropylene (PP)/polyolefin elastomer (POE) blends and MgO/PP/POE nanocomposites were fabricated by melt blending. The morphology, mechanical, and electrical properties of the nanocomposites were investigated. Scanning electron microscopy showed that the surface‐modified MgO nanoparticles were well dispersed in the polymer matrix at low loadings of less than 3 phr. X‐ray diffraction demonstrated that the crystalline phases of PP in the composites were changed and that the β phase significantly increased. An examination of the electrical properties revealed that the direct‐current (dc) electric breakdown strength and space‐charge suppression effect were remarkably improved by the introduction of the surface‐modified MgO nanoparticles. In addition, obvious enhancements in the tensile modulus and strength were obtained as a result of the synergistic toughening of the POE and MgO nanoparticles. Thus, MgO/PP/POE nanocomposites with enhanced mechanical and electrical properties have great potential to be used as recyclable insulation materials for high‐voltage dc cables with large transmission capacities and high operating temperatures. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132, 42863.