低门尼粘度导电三元乙丙橡胶材料的性能研究

从生胶种类、炭黑用量、增塑剂种类及硫化体系对EPDM性能的影响进行了研究。结果表明,选取75份EPDM8550与50份EPDM4869并用,N550炭黑40份与导电炭黑20份并用时,加入增塑剂石蜡油,选用不溶性硫磺0.5、TRA 0.3、DM 1.5、BZ 1.0、DTDM 2.0的硫化体系制备的EPDM门尼粘度较低,具备良好的物理机械性能和导电性能。     

BR/CB/OMMT纳米复合材料的结构与性能研究

采用溶液插层法与双辊混炼法制备了顺丁橡胶/炭黑/有机蒙脱土（BR/CB/OMMT）纳米复合材料,用透射电子显微镜（TEM）以及X射线衍射（XRD）方法对复合材料的亚微观结构进行了表征,并研究了复合材料的力学特性、耐磨耗性能以及硫化特性。结果表明：BR/CB/OMMT为插层型纳米复合材料;在OMMT含量小于4份时,BR/CB/OMMT纳米复合材料具有优异的力学性能和耐磨耗性能;OMMT起到了硫化促进剂的作用,降低了BR的焦烧时间（TS）和正硫化时间（T90）;低填充量OMMT可提高复合材料的交联密度。     

偶联剂对凹凸棒土/三元乙丙橡胶复合材料性能的影响

研究偶联剂品种和用量对凹凸棒土（AT）/三元乙丙橡胶（EPDM）复合材料性能的影响。结果表明：与未用偶联剂改性的AT/EPDM复合材料相比,偶联剂改性的AT/EPDM复合材料物理性能明显提高;采用偶联剂Si69改性的AT/EPDM复合材料物理性能最好;偶联剂Si69用量为1份时,AT用量为50份的AT/EPDM复合材料物理性能较好。     

炭黑与NR/BR/EPDM共混胶混炼工艺研究

研究了混炼工艺对天然橡胶（NR）/顺丁橡胶（BR）/三元乙丙橡胶（EPDM）共混胶性能的影响。结果表明：炭黑预混入EPDM的混炼工艺可以改善NR/BR/EPDM共混胶的流动性,改善炭黑的分散程度,提高胶料的物理机械性能和耐屈挠疲劳性,预混入炭黑量以20%～50%（质量分数）较为合理;采取50%比例的硫化剂、促进剂、活性剂预混入EPDM的工艺方法能有效改善NR/BR/EPDM的共硫化性,显著提高胶料的物理机械性能和耐屈挠疲劳性。     

导电炭黑/三元乙丙橡胶电磁屏蔽复合材料的性能研究

以三元乙丙橡胶(EPDM)为基体、导电炭黑为导电填料,并添加增塑剂,制备可挤出加工的炭黑/EPDM电磁屏蔽复合材料,研究炭黑和增塑剂的品种和用量对复合材料性能的影响.结果表明:添加结构度高、粒径小的导电炭黑有利于形成导电网络;随着炭黑用量的增大,复合材料的体积电阻率逐渐降低,当炭黑用量达到18份时,可以得到体积电阻率小于10Ω·cm的导电橡胶复合材料;添加20份石蜡油时,能有效降低胶料的门尼粘度.     

环氧化溶聚丁苯橡胶用作大分子偶联剂改性白炭黑/顺丁橡胶复合材料的性能研究

制备环氧度为15%的环氧化溶聚丁苯橡胶（ESSBR）,以其作为大分子偶联剂对白炭黑/顺丁橡胶（BR）复合材料进行改性,研究白炭黑/ESSBR/BR复合材料的性能,并与偶联剂Si69/白炭黑/溶聚丁苯橡胶（SSBR）/BR复合材料进行对比。结果表明,白炭黑/ESSBR/BR复合材料的白炭黑分散性、拉伸性能、抗湿滑性能和耐磨性能均有不同程度的提高,滚动阻力降低,且无挥发性有机化合物的排放,该复合材料可用于轮胎胎面胶。     

天然橡胶/顺丁橡胶复合材料抗裂口增长性能影响因素研究

研究炭黑的种类及用量、硫化体系、硫化条件和天然橡胶(NR)/顺丁橡胶(BR)并用比等因素对NR/BR复合材料抗裂口增长性能的影响。结果表明:当炭黑用量在一定范围内时,炭黑的种类和用量影响NR/BR复合材料的抗裂口增长性能;随着促进剂NS用量的增大或硫化时间的延长,NR/BR复合材料抗裂口增长性能变差;适当提高硫化温度或增大硫黄用量,NR/BR复合材料的抗裂口增长性能提高;NR/BR并用比、炭黑分布或硫化体系不同时,NR/BR复合材料的抗裂口增长性能都有差异性。     

NR/BR复合材料抗裂口增长性能影响因素研究

摘要：研究了填料种类和用量、硫化体系、硫化条件和NR与BR的并用比等因素对NR/BR复合材料抗裂口增长性能的影响。结果表明：对于NR/BR复合材料,炭黑用量在一定范围内时,炭黑用量和种类影响硫化胶的抗裂口增长性能;随着促进剂用量提高或延长硫化时间,抗裂口增长性能变差;而适当提高硫化温度或硫磺用量,NR/BR复合材料的抗裂口增长性能提高;NR/BR并用比、炭黑分布或硫化体系不同时,NR/BR复合材料的耐裂口增长性能都有差异性。     

无卤阻燃EVM/EPDM并用胶的性能研究

试验研究乙烯-乙酸乙烯酯橡胶（EVM）/EPDM并用胶的性能。结果表明,随着EPDM用量的增大,EVM/EPDM并用胶的物理性能变化不大,热空气老化后并用胶的邵尔A型硬度和拉伸强度增大,拉断伸长率减小,耐低温性能提高；EVM或EVM/EPDM并用胶的阻燃性能明显优于EPDM；添加阻燃剂和增塑剂的EVM/EPDM并用胶的相容性较未添加阻燃剂和增塑剂的并用胶有所改善。     

CRH2和CRH3型动车组用U形外风挡耐低温性能的研究

以三元乙丙橡胶（EPDM）为主体橡胶,通过添加石蜡油以及EPDM与聚烯烃弹性体（POE）和顺丁橡胶（BR）并用来制得耐低温性能优良的CRH2和CRH3型动车组用U形外风挡胶料,并测试U形外风挡涂层性能。结果表明：添加石蜡油可以提高外风挡胶料的耐低温性能,但会影响U形外风挡漆膜与母材的附着力,石蜡油用量不宜超过10份;EPDM与BR和POE并用可以获得耐低温性能（耐－55 ℃低温）、耐屈挠性能和物理性能优异的U型外风挡胶料,制得的U型外风挡适合在较寒冷的环境下使用。     

液体聚丁二烯橡胶对顺丁橡胶/天然橡胶共混胶加工性能及抗疲劳性能的影响

考察了液体聚丁二烯橡胶Activ-50对顺丁橡胶(BR)/天然橡胶(NR)共混胶加工性能及抗疲劳性能的影响,并采用裂纹增长测试平台结合有限元ABAQUS/CAE,从疲劳裂纹扩展角度对硫化胶的抗疲劳性能进行了考察.结果表明,Activ-50能够降低混炼胶的储能模量和黏度,橡胶共混过程中加入Activ-50能改善体系的加工...     

Thermal and mechanical properties of silicon rubber/cis‐polybutadiene rubber/ethylene–propylene–diene monomer blends

Considering the properties of silicon rubber, ethylene–propylene–diene monomer (EPDM), and cis‐polybutadiene rubber (BR), a blend made by a new method was proposed in this article; this blend had thermal resistance and good mechanical properties. The morphology of the blend was studied by SEM, and it was found that the adhesion between the phases of BR, EPDM, and polysiloxanes (silicon rubber) could be enhanced, and the compatibility and covulcanization were good. The influence of the mass ratio of peroxide and silica on the mechanical properties and thermal resistance of the blend was studied. The results showed that the mechanical properties and thermal resistance of the blend were improved when silicon rubber/BR/EPDM was 20/30/50, dicumyl peroxide/sulfur was 2.5/2.5, and the amount of silica was 80 phr. The integral properties of rubber blend had more advantages than did the three rubbers. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4462–4467, 2006     

Studies on electrically conductive composites of ethylene propylene diene monomer rubber and steel fibers

Electrically conductive composites comprised of ethylene propylene diene monomer (EPDM) rubber and steel fibers were prepared by an open mill mixing method. Fibers of two distinctly different lengths (5 mm and several meters) were used and the influence of these fibers on electrical conductivity, mechanical, thermal, and physical properties of the composites was investigated. Composites with different compositions were prepared by varying the loading levels of fibers from 20–100 phr (parts per hundred parts of rubber). Homogeneity of the composites was determined using scanning electron microscopy. Further analysis included the measurement of resistance, hardness, tensile strength, tear strength, rebound resilience, etc. The results of the analysis revealed that the addition of steel fibers rendered conductivity to the otherwise insulating EPDM rubber even at small loading levels, however, the length appears to have negligible effect on conductivity. In case of short fibers, the resistance of composites was observed to decrease from > 40 MΩ (Initial value of EPDM rubber) to 25 KΩ at a loading level of 20 phr with a further significant decrease of the order of 10³, that is around 18 Ω at 100 phr. Composites with long fibers exhibited resistance in the range of 15 kΩ–70 Ω at loading levels between 30 and 100 phr. The conductivity of the sample is observed to be altered negligibly on ageing. Mechanical properties such as hardness, tensile, and tear strength were observed to be enhanced in case of composites except resilience which decreased by 29 % in comparison to EPDM rubber. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

环氧化天然橡胶共交联改性EPDM/NR共混物的性能

将三元乙丙橡胶(EPDM)与环氧化天然橡胶(ENR)共交联改性后,再与天然橡胶(NR)共混,考察了ENR共交联改性EPDM/NR共混胶的硫化特性、硫化胶的物理机械性能、溶胀指数和耐热空气老化性能,并对该硫化胶进行了差示扫描量热分析。结果表明,EPDM经过ENR共交联改性后与NR共混,ENR共交联改性EPDM/NR共混胶的交联程度明显提高,各相达到了同步交联,硫化胶的综合性能得到了显著改善。     

反式聚辛烯橡胶改性天然橡胶/顺丁橡胶共混胶的性能

研究了反式聚辛烯橡胶(TOR)改性天然橡胶(NR)/顺丁橡胶(BR)(二者质量比80/20)共混胶的性能.结果表明,采用5～15份(质量,下同)TOR改性NR/BR混炼胶的门尼黏度逐渐降低、Payne效应基本不变,共混胶的焦烧时间和工艺正硫化时间延长、硫化速率减慢.相比NR/BR硫化胶,NR/BR/TOR硫化胶的拉伸强...     

Microwave absorption performance of nitrile butadiene rubber/ethylene propylene diene monomer rubber filled with multiwalled carbon nanotubes

In recent times, there is an increasing need for effective control of electromagnetic pollution, which can avoid excessive radiation effects on the human body. Microwave absorption materials are attracting wide research interests to reduce electromagnetic pollution due to the rapid development of electronic equipment. In this study, Nitrile butadiene rubber (NBR)/ethylene propylene diene monomer rubber (EPDM) were mixed with multiwalled carbon nanotubes (MWCNT) to prepare microwave absorbing materials. The distribution of fillers, AC conductivity, complex permittivity, and microwave absorption performance of the composites were systematically investigated. It found that the AC conductivity, both real and imaginary parts of the permittivity were significantly improved in the composite with the increasing ratio of MWCNT contents. The NBR/EPDM/MWCNT composites with eight parts per hundred concerning with rubber (phr) MWCNT had a minimum reflection loss (RLmin) of −48.1 dB at the optimum thickness of 2.07 mm. Importantly, the adding sequence of MWCNT and plasticizer dioctyl phthalate (DOP) to the rubber matrix is found to play an important role in determining the distribution of fillers and the structure of polymer blends. The composite with plasticizer added before MWCNT exhibited a better impedance matching and as a result, achieved a good microwave absorption performance.     

天然橡胶/三元乙丙橡胶并用胶共混改性研究进展

系统总结了天然橡胶和三元乙丙橡胶相容性和共硫化性差的原因,从调节生胶共混比、增加增容剂用量、优选交联剂、改进共混工艺、对生胶进行化学改性和辐射硫化改性等角度较为全面地介绍了近年来在天然橡胶/三元乙丙橡胶并用胶共混改性方面的技术进展,并对天然橡胶和三元乙丙橡胶共混改性领域内未来的发展趋势进行了展望。     

Naturally occurring halloysite nanotubes for enhanced durability of natural rubber/ethylene propylene diene monomer rubber vulcanizate

A facile approach of using halloysite nanotubes (HNTs) was proposed to address the durability performance demands of natural rubber (NR)/ethylene propylene diene monomer rubber (EPDM) blends and to protect them from the deleterious effects of the service environment including ozone, chemicals, abrasion, and cyclic loading. The introduction of HNTs substantially improved the stability of NR/EPDM when exposed to ozone (over fourfold enhancement with the addition of 5 phr HNTs). Moreover, the HNT-filled NR/EPDM vulcanizates offered approximately 66% reduction in the solvent-mediated swelling in comparison to the unfilled sample. Fatigue life studies showed that the HNT-reinforced NR/EPDM composite could withstand 30% more cycles to failure than the un-reinforced NR/EPDM blend. The effect of various HNT loading on the morphological, mechanical, physical, and rheological properties of nanocomposite vulcanizates based on NR/EPDM was also investigated. The morphological investigations revealed that the introduction of HNT into the NR/EPDM rubber matrix caused a rough morphology in fracture surface and a well-dispersed structure was obtained with the addition of up to 5 phr of HNTs. These findings were further supported by rheological, mechanical, and thermodynamical results.     

Natural rubber/ethylene propylene diene blends for high insulation iron crossarms

This research studied the composition and behavior of natural rubber (NR) and ethylene propylene diene monomer (EPDM) blends at various carbon black concentrations (0–30 phr) in terms of electrical resistivity, dielectric breakdown voltage testing, and physical properties. The blends having electrical properties suitable for application in high‐insulation iron crossarms were selected for investigation of compatibility and increased physical properties. The effect of the homogenizing agent concentration on improvement of compatibility of blends was studied by scanning electron microscopy, pulsed nuclear magnetic resonance spectroscopy, and rheology techniques. We also examined mechanical properties such as tensile strength, tear strength, elongation at break, and hardness. The NR/EPDM blends filled with a fixed concentration of silica were investigated for ozone resistance. A carbon black content as high as 10 phr is still suitable for the insulation coating material, which can withstand electrical voltage at 10 kVac. Addition of the homogenizing agent at 5 phr can improve the mechanical compatibility of blends, as evidenced by the positive deviation of shear viscosity of the rubber blend, that is, the calculated shear viscosity being higher than that of experimental data. Moreover, the pulsed NMR results indicated that the spin‐spin relaxation (T₂) of all three components of the rubber blend was compressed upon the addition of the homogenizing agent. The ratio of NR/EPDM in the blend to best resist the ozone gas is 80/20 with the addition of silica of 30 phr into the blend. Also, the NR/EPDM filled with silica had a decreased change in thermal and mechanical properties of blends after thermal aging. The synergistic effect of silica content and high NR content (80) in 20 phr EPDM could improve antioxidation by ozone in the absence of a normal antioxidant for natural rubber. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3401–3416, 2004     

短切碳纤维对天然橡胶/顺丁橡胶复合材料性能的影响

以天然橡胶(NR)和顺丁橡胶(BR)为基料,以短切碳纤维(SCF)为添加剂,制备了SCF/NR/BR复合材料,考察了SCF用量对NR/BR的摩擦性能及力学性能的影响。结果表明,SCF可增强NR/BR基体的强度,增大其硬度。在NR/BR混合胶中加入15份SCF可以降低混合胶的摩擦系数,减少混合胶的磨损量,提高混合胶的耐磨性能。SCF增强的NR/BR在摩擦过程中发生了磨粒磨损和黏着磨损,形成了卷曲磨屑。