溴化丁基橡胶/丁腈橡胶并用胶微观结构和性能研究

用改性沥青作相容剂,研究溴化丁基橡胶(BIIR)/丁腈橡胶(NBR)并用胶的微观结构和性能。结果表明:与未添加改性沥青CJ-100的BIIR/NBR并用胶相比,添加改性沥青CJ-100的BIIR/NBR并用胶的相容性较好,加工性能改善,气密性、耐屈挠和耐臭氧性能提高;添加5份改性沥青CJ-100的BIIR/NBR(并用比为80/20)并用胶物理性能、气密性、耐屈挠和耐臭氧性能较好,气密性接近全BIIR胶料,有望用于全钢载重子午线轮胎气密层。     

天然橡胶/溴化丁基橡胶并用胶性能的研究

研究并用比对天然橡胶(NR)/溴化丁基橡胶(BIIR)并用胶硫化特性、物理性能、耐热空气老化和耐臭氧老化性能及不同温度下损耗因子(tanδ)的影响。结果表明:NR并用BIIR后,胶料的硫化速度加快;随着BIIR用量的增大,NR/BIIR并用胶的物理性能下降,耐热空气老化和耐臭氧老化性能提高;并用一定量BIIR能明显改善NR的耐屈挠性能;随着BIIR用量的增大,NR/BIIR并用胶的tanδ增大,其在较宽的温度范围内具有较大的损耗和较好的减震性能。     

天然橡胶/溴化丁基橡胶并用胶性能的研究

研究并用比对天然橡胶(NR)/溴化丁基橡胶(BIIR)并用胶硫化特性、物理性能、耐热空气老化和耐臭氧老化性能及不同温度下损耗因子(tanδ)的影响。结果表明：NR并用BIIR后,胶料的硫化速度加快;随着BIIR用量的增大,NR/BIIR并用胶的物理性能下降,耐热空气老化和耐臭氧老化性能提高;并用一定量BIIR能明显改善NR的耐屈挠性能;随着BIIR用量的增大,NR/BIIR并用胶的tanδ增大,其在较宽的温度范围内具有较大的损耗和较好的减震性能。     

酚醛树脂对BIIR/NR轮胎内衬层胶料性能的影响

研究了酚醛树脂SP1045用量对BIIR/NR共混胶硫化性能、力学性能、耐热空气老化性能、耐臭氧老化性能、耐屈挠性能以及气密性能的影响。结果表明,随着酚醛树脂用量的增大,共混胶正硫化时间(t_(90))缩短,硫化速度加快;力学性能总体不断增大;耐热空气老化性能和耐臭氧老化性能表现优异;随酚醛树脂用量的增大,气密性升高;酚醛树脂用量为8份时,共混胶耐屈挠性能表现最佳,综合性能最好。     

再生溴化丁基橡胶在半钢子午线轮胎气密层胶中的应用

研究再生溴化丁基橡胶(再生BIIR)替代再生丁基橡胶(再生IIR)在半钢子午线轮胎气密层胶中的应用。结果表明:再生BIIR符合欧盟环保要求;采用再生BIIR替代再生IIR后,胶料的硫化特性和硫化胶的物理性能相当,硫化胶的屈挠次数在同一水平范围,但屈挠裂口发生晚,裂口增长速率前期慢、后期稍快,气密性和耐屈挠性能略好。     

国产溴化丁基橡胶在全钢载重子午线轮胎气密层胶中的应用

研究国产溴化丁基橡胶(BIIR)在全钢载重子午线轮胎气密层胶中的应用。结果表明:与进口BIIR相比,国产BIIR的挥发物质量分数和灰分质量分数较小;与进口BIIR气密层胶相比,国产BIIR气密层胶的门尼焦烧时间、硫化特性、物理性能、耐屈挠性能和耐热老化性能相当,气密性略好,可以满足气密层胶的需求;国产BIIR性价比高,经济效益显著。     

丁腈橡胶/三元乙丙橡胶并用胶的制备及性能

将丁腈橡胶(NBR)与三元乙丙橡胶(EPDM)并用,考察了生胶牌号、并用比、并用工艺对NBR/EPDM并用胶性能的影响,并对其耐臭氧及耐油性能进行了分析.结果表明,选用第三单体为亚乙基降冰片烯(即E型)的EPDM可以改善其与NBR的共硫化性能;当门尼黏度相近的NBR与EPDM的并用比(质量比)为70/30,且采用2种生胶先混炼,而后加入各种配合剂的制备工艺,并用胶具有良好的耐臭氧性能及物理机械性能;具有以NBR为连续相、EPDM为分散相结构形态的并用胶有较好的耐油性能与良好的耐臭氧性能.     

硅烷偶联剂对白炭黑填充溴化丁基橡胶/天然橡胶并用胶性能的影响

试验研究硅烷偶联剂Si69,Si75和KH560对白炭黑填充溴化丁基橡胶(BIIR)/天然橡胶(NR)并用胶性能的影响。结果表明:随着硅烷偶联剂Si75或KH560用量的增大,胶料的挤出膨胀率呈增大趋势,门尼粘度和F;减小,Payne效应减弱,定伸应力和拉伸强度呈增大趋势,拉断伸长率和撕裂强度呈减小趋势,加工性能和老化后耐屈挠性能改善;硅烷偶联剂Si75和KH560能够明显改善白炭黑填充BIIR/NR并用胶的加工性能和老化后的耐屈挠性能。     

天然橡胶/三元乙丙橡胶并用胶性能的研究

研究天然橡胶(NR)/三元乙丙橡胶(EPDM)并用比和相容剂PNE用量对NR/EPDM并用胶性能的影响。结果表明:随着EPDM用量增大,并用胶的物理性能降低,耐热空气老化性能和耐臭氧老化性能提高;相容剂PNE部分等量替代EPDM后,并用胶的相容性改善,随着相容剂PNE用量增大,并用胶的物理性能和耐屈挠龟裂性能提高。     

用防老剂及并用防老剂提高轮胎胶料的耐屈挠疲劳和动态臭氧龟裂性能(续完)

(接上期) 3 用各种类型防老剂及其并用物改善NR/BR炭黑胎侧胶料动态屈挠及耐动态臭氧龟裂性能的评价 3.1 胎侧胶 典型的胎侧胶不是使用NR/BR,就是使用NR/BR/SBR,以改善耐割口增长、耐磨耗以及动态屈挠性能.胎侧暴露于外部环境中,因此需要进行防臭氧或氧化龟裂的保护.通常使用2.5～4.0份的烷基芳基对苯二胺,如6PPD或IPPD与混合蜡结合,用于静态和动态耐臭氧龟裂防护以及改善耐屈挠疲劳性能.此外,NR和顺式BR滞后损失小,行驶温度低,这种较低的行驶温度又可以改善屈挠疲劳性能.     

Assessment of various nano-clays in bromobutyl rubber hydrogenated acrylonitrile butadiene rubber blend for improved gas barrier applications

For the past few decades, butyl rubber (IIR) and its derivatives have been used primarily in air barrier applications. Recently other synthetic rubbers like hydrogenated acrylonitrile butadiene rubber (HNBR) has attracted attention for its air barrier properties. A blend of brominated butyl rubber (BIIR) and HNBR can be a potential and novel material with improved technical features as well as excellent processing behavior. In this article, laponite (RD) and bentonite (MT) nano-clays have been used to prepare BIIR-HNBR blend based nanocomposites. A detailed investigation of nanocomposite morphology has been done using the transmission electron microscope results. The improvement in terms of mechanical and gas barrier properties of BIIR-HNBR nano-clay composites over BIIR-carbon black composites have been explored in detail. The air impermeability of BIIR-HNBR blends shows a 20% improvement compared to the reference composite. The results clearly demonstrate the usefulness and effectiveness of the material in gas barrier applications.     

Investigation on the mechanical properties and oil resistance of sulfur cured nitrile rubber/hydrogenated nitrile butadiene rubber blends

Nitrile rubber (NBR)/hydrogenated nitrile butadiene rubber (HNBR) blends with various ratios were compounded with internal mixer and two-roll open mill. Mechanical properties and low-temperature performance (TR10) of the NBR/HNBR blends after aging under different conditions were investigated. Furthermore, equilibrium swelling test and moving die rheometer (MDR) test were used to systematically investigate the effects of HNBR dosage on the crosslink densities and curing behaviors. Vulcanization torque and crosslink densities decreased with an increase in HNBR content. The crosslink density of pure HNBR is higher than that of pure NBR, which is related to the macromolecular structures of the rubber. Compression sets of the NBR/HNBR vulcanizates were correlated with HNBR dosage indicating a linear relationship. Low-temperature performance of the NBR/HNBR blends was improved after being aged in the synthetic hydrocarbon hydraulic oils (SH-1 and SH-2). This work shows that the low-temperature performance and oil resistance could be better balanced by blending NBR with HNBR, while the mechanical properties maintain relatively high level.     

共混比对丁腈橡胶/氯醚橡胶性能的影响

研究了共混比时常规共混及动态硫化共混丁腈橡胶(NBR)／氯醚橡胶(ECO)的力学性能及加工流变性能的影响。结果表明,共混比对NBR／ECO胶料的力学性能及加工流变性能影响显著。NBR经动态硫化后,压缩永久变形及挤出胀大明显减小,拉伸强度提高,表现黏度随ECO用量的增大而减小。共混比对常规共混胶的表观黏度影响不大。动态硫化有利于改善NBR／ECO胶料的加工性能。     

Mechanical properties,thermal stability,gas permeability,and phase morphology in natural rubber/bromobutyl rubber blends

This work was performed to relate the morphological features and all important properties of the natural rubber (NR) and bromobutyl rubber (BIIR) blends containing hybrid fillers. The BIIR content was varied from 0 to 100 wt%. It is found that tensile and tear strength, hardness as well as resilience of blends tend to decrease with increasing BIIR loading. Regarding the blend morphology, phase inversion is observed when BIIR loading is >50 wt % where BIIR becomes a continuous phase. This result coincides with the marked improvement of thermal stability of the blends determined using thermogravimetric analysis and heat ageing method. Interestingly, that, the gas permeability of blends markedly reduces with an increase in BIIR loading up to 40 wt % when the relatively large elongated particles of BIIR dispersed phase is formed. The results indicate that the relatively large connected structure of the dispersed BIIR can act effectively as a gas barrier. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Properties and morphology of crosslinked butadiene-acrylonitrile rubber and polysulphide rubber (NBR/TM) blends

Blending of thermodynamically immiscible butadiene–acrylonitrile rubber (NBR) and polysulphide rubber (TM) results in superior performance materials as regards solvent resistance, and shows some unusual relations between the composition and properties of the blends obtained. Improved performance after vulcanization is probably because of better interphase bonding, resulting from NBR–TM co-crosslinking. Occurrence of such bonding and its role in amelioration of some of the blends’ properties are discussed in this paper. The effect of TM concentration and crosslinking system on vulcanization state and behaviour is studied by application of chemical, mechanical and thermal methods. © 1998 SCI.     

Swelling and mechanical properties of (acrylonitrile‐butadiene rubber)/(hydrogenated acrylonitrile‐butadiene rubber) blends with precipitated silica filled in gasohol fuels

This work studied the effects of hydrogenated acrylonitrile‐butadiene rubber (HNBR) and precipitated silica (PSi) loadings in acrylonitrile‐butadiene rubber (NBR) filled with 60 parts per hundred of rubber (phr) of carbon black (CB) for oil‐resistant seal applications in contact with gasohol fuel. The cure characteristics, mechanical properties, and swelling behavior of HNBR/NBR blends reinforced with PSi before and after immersion in ethanol‐based oils (E10, E20, and E85) were then monitored. This work studied the effects of PSi loading in rubber compounds on the mechanical properties of the rubber blends. The results suggested that the scorch time of CB‐filled NBR/HNBR was not affected by HNBR loading, but the cure time, Mooney viscosity, and torque difference increased with HNBR content. The swelling of the blends in E85 oil were relatively low compared with those in E10 and E20 oils. The recommended NBR/HNBR blend ratio for oil‐resistant applications was 50/50. Tensile strength and elongation at break before and after immersion in gasohol oils increased with HNBR loading, and the opposite effect was found for tensile modulus and hardness. PSi filler had no effect on scorch time, but decreased the cure time of the blends. The swelling level of the blends slightly decreased with increasing PSi content. The recommended silica content for optimum reinforcement for black‐filled NBR/HNBR blend at 50/50 was 30 phr. The results in this work suggested that NBR/HNBR blends reinforced with 60 phr of CB and 30 phr of silica could be potentially used for rubber seals in contact with gasohol fuels. J. VINYL ADDIT. TECHNOL., 22:239–246, 2016. © 2014 Society of Plastics Engineers     

Improvement of the homogeneity of SBR/NBR blends using polyglycidylmethacrylate‐g‐butadiene rubber

Polyglycidylmethacrylate grafted butadiene rubber (PGMA‐g‐BR) was synthesized by a graft solution copolymerization technique. The PGMA content was determined through titration against HBr. The PGMA‐g‐BR was blended with styrene butadiene rubber/butadiene acrylonitrile rubber (SBR/NBR) blends with different blend ratios. The SBR/NBR (50/50) blend was selected to examine the compatibility of such blends. Compatibility was examined using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and viscosity measurements. The scanning electron micrographs illustrate the change of morphology of the SBR/NBR rubber blend as a result of the incorporation of PGMA‐g‐BR onto that blend. The T_gs of SBR and NBR in the blend get closer upon incorporation of PGMA‐g‐BR 10 phr, which indicates improvement in blend homogeneity. The intrinsic viscosity (η) versus blend ratio graph shows a straight‐line relationship, indicating some degree of compatibility. Thermal stability of the compatibilized and uncompatibilized rubber blend vulcanizates was investigated by determination of the physicomechanical properties before and after accelerated thermal aging. Of all the vulcanizates with different blend ratios under investigation, the SBR/NBR (25/75) compatibilized blend possessed the best thermal stability. However, the SBR/NBR (75/25) compatibilized blend possessed the best swelling performance in brake fluid. The effect of various combinations of inorganic fillers on the physicomechanical properties of that blend, before and after accelerated thermal aging, was studied in the presence and absence of PGMA‐g‐BR. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1559–1567, 2006     

Influences of trans‐polyoctylene rubber on the physical properties and phase morphology of natural rubber/acrylonitrile–butadiene rubber blends

The influence of trans‐polyoctylene rubber (TOR) on the mechanical properties, glass‐transition behavior, and phase morphology of natural rubber (NR)/acrylonitrile–butadiene rubber (NBR) blends was investigated. With an increased TOR level, hardness, tensile modulus, and resilience increased, whereas tensile strength and elongation at break tremendously decreased. According to differential scanning calorimetry and dynamic mechanical analysis, there were two distinct glass‐transition temperatures for a 50/50 NR/NBR blend, indicating the strongly incompatible nature of the blend. When the TOR level was increased, the glass transition of NBR was strongly suppressed. NBR droplets of a few micrometers were uniformly dispersed in the continuous NR phases in the NR/NBR blends. When TOR was added to a 50/50 NR/NBR blend, TOR tended to be located in the NR phase and in some cases was positioned at the interfaces between the NBR and NR phases. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 125–134, 2002     

氯醚橡胶/丁腈橡胶共混物的结构与性能

研究了不同并用比的氯醚橡胶（ECO）／丁腈橡胶（NBR）共混物的相态结构,力学性能,耐老化性能和耐油性能,透射电镜照片显示：ECO／NBR为70／30（质量份,下同）时共混物呈双连续相：为60／40和40／60时ECO都为分散相,且两相界面清晰。加入NBR降低了ECO的拉伸强度和看断伸长率,以及耐热空气老化性能,随着NBR用量的提高,共混物硫化胶在油中的体积变化率增加,ECO／NBR为70／30时硫化胶在100℃热油中的性能保持率最高,而且体积变化率与ECO的相当。     

Unsaturated polyester as compatibilizer for styrene–butadiene (SBR)/acrylonitrile–butadiene (NBR) rubber blends

The effect of the addition of 5 and 10 phr of unsaturated polyester resin (UPE) on the compatibility and physicomechanical properties of styrene–butadiene (SBR) and acrylonitrile–butadiene (NBR) rubber blends was studied. Differential scanning calorimetry (DSC), scanning electron microscopy (SEM), electrical, and ultrasonic techniques were used to determine the degree of the compatibility (DC). The results obtained revealed that, by the addition of 10 parts per hundred parts of rubber (phr) UPE as a compatibilizer for SBR/NBR blends, the degree of compatibility was greatly enhanced. The rheological and mechanical properties of the blends were also improved. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2314–2321, 2002