EPDM/CR共混物的研究

研究了橡胶共混比、硫化体系、高耐磨炭黑用量及共混工艺等对ＥＰＤＭ／ＣＲ共混物性能的影响,考察了共混物的力学性能、耐高温硝酸性能、热空气老化性能、耐辐射性能和相容性。试验结果表明,采用炭黑全部加入ＥＰＤＭ中然后与ＣＲ混合的共混工艺,所得硫化胶的力学性能超过两种橡胶硫化胶力学性能的加和值;共混胶中ＥＰＤＭ采用硫黄硫化才能得到比较好的力学性能。硫化动力学研究表明ＣＲ的硫化速度较ＥＰＤＭ的硫化速度对温度的依赖性小。ＤＳＣ和ＤＶＡ分析结果表明共混胶具有两个明显的玻璃化转变温度,为热力学不相容体系。研制的ＥＰＤＭ／ＣＲ共混物具有耐老化、耐高温硝酸、耐辐射、粘合好等优良性能。     

HNBR/NBR共混物的动态硫化

以硫黄（１．５份）、促进剂ＤＭ９１．５份）作为ＮＢ交联剂，在１００℃下动态硫化８ｍｉｎ，制得ＨＮＢＲ／ＮＢＲ共混物。考察了不同硫化体系及并用比对动态硫化共混物性能的影响。对比了动态硫化和静态硫化共混物在性能上的差异，并对其加工流动性和微观结构作了探讨。结果表明，随着ＨＮＢＲ含量的增加，动态硫化共混物性能提高，尤其是动态硫化共混物的耐热空气第化性能要优于静态硫化共混物，ＴＥＭ分析表明，ＨＮＢＲ／ＮＮ     

HNBR/NBR共混物的静态硫化

研究了混炼工艺、硫化体系、氢化丁腈橡胶（ＨＮＢＲ）的饱和度及并用比对ＨＮＢＲ／丁腈橡胶（ＮＢＲ）共混物性能的影响,并通过ＴＥＭ和ＤＭＡ考察了共混物的结构和相容性。结果表明,混炼工艺对性能的影响水大;采用质量份分别为过氧化二异丙苯４、硫黄０．３和促进剂ＣＺ１．５的硫化体系,选择饱和度为９５％的ＨＮＢＲ与ＮＢＲ共混,共混物有较好的物理机械性能和热空气老化性能;共混物物理机械性能随ＨＮＢＲ用量的增加面提     

氟橡胶/EPDM动态硫化共混物的研究

研究了动态硫化工艺条件和共混比对氟橡胶（ＦＫＭ）／ＥＰＤＭ共混物拉伸性能拉、热油老化性能和应力松弛性能的影响。结果表明：与直接静态硫化相比,动态硫化可避免两种硫化体系的相互影响;静态硫化共混物拉伸强度只有２ＭＰａ,而动态硫化共混物可达１０ＭＰａ以上;工艺条件对动态硫化共混物性能的影响不大;随共混物中ＥＰＤＭ用量的增大,共混物的热空气老化和热油老化性能均有所下降     

EPDM／PA增强共混的初步研究

在７０份三元乙丙橡胶（ＥＰＤＭ）与３０份三元共聚尼龙（ＰＡ）的共混体系中掺入１５份的氯化聚乙烯,采用过氧化物硫化体系,可作为耐热氧老化的高性能弹体的基础配方。实验结果表明,与未采用ＰＡ增强的ＥＰＤＭ过氧化物硫化胶相比,ＥＰＤＭ／ＰＡ共混物的撕裂强度及拉伸强度有大幅度提高,耐热氧老化性能优良,磨耗及动态生热有明显改善。初步探讨了共混体系的微观结构。     

动态硫化了腈橡胶／酚醛树脂共混型热塑性弹性体性能的研究

用动态硫化法制备了丁腈（ＮＢＲ）／酚醛树脂（ＰＦ）共混型热塑性弹性体。研究了ＮＢＲ中丙烯腈含量、ＰＦ品种、橡塑并用比和硫化体系对共混物性能的影响。研究结果表明：随ＮＢＲ中丙烯腈含量的增加，共混物的强度有所提高；随ＰＦ用量的增加，共混物的拉伸强度显著提高，耐油性能和老化性能均得到明显提高：硫磺硫化体系可使ＮＢＲ／ＰＦ并用体系硫化胶有较好的物理机械性能。     

NBR/EPDM共混物的研究

研究了胶料配方和加工工艺对ＮＢＲ／ＥＰＤＭ共混物性能的影响。试验结果表明,ＮＢＲ／ＥＰＤＭ以６０／４０比例共混,可以采用ＤＣＰ＋硫黄硫化体系,补强填料可以采用活性比较大的炭黑,如果采用白色或浅色填料,则要添加偶联剂;共混物混炼可采用ＮＢＲ和ＥＰＤＭ分别配合混炼,然后再按比例掺混的工艺;ＮＢＲ／ＥＰＤＭ以６０／４０比例共混,耐臭氧性优良,低温性能和耐热性能较好,耐油性能一般。     

稀土BR／SBR共混胶的性能

研究了４种共混比的ＬｎＢＲ／ＳＢＲ共混生胶、混炼胶及硫化胶的性能，并与ＮｉＢＲ／ＳＢＲ共混胶进行了对比。结果表明，共混生胶的ＭＬ均低于ＬｎＢＲ及ＳＢＲ；当ＬｎＢＲ／ＳＢＲ共混混炼胶的ＭＬ、剪切应力、出口膨胀及硫化速度均低于ＮｉＢＲ／ＳＢＲ共混胶，挤出物外观优于后者；共混硫化胶的拉伸强度、热空气老化、拉伸疲劳、湿滑、耐磨等性能均明显优于后者，生热和透气率高于后者。     

动态硫化丁腈橡胶／酚醛树脂共混型热塑性弹性体性能的研究

用动态硫化法制备了丁腈（ＮＢＲ）／酚醛树脂（ＰＦ）共混型热塑性弹性。研究了ＮＢＲ中丙烯腈含量、ＰＦ品种、橡塑并比和硫化体系对共混通用性能的影响。研究结果表明：随ＮＢＲ中烯腈含量的增加，共混物的强度有所提高：随ＰＦ用量的增加，共混物的拉伸强度显著提高，耐油性能和老化性能均得到明显的提高硫磺硫人体系可使ＮＢＲ／ＰＦ并用 化胶有较好的机理机械性能。     

氯化亚锡对BR/CPE共混物自硫化的影晌

在ＢＲ／ＣＰＥ自硫化共混物中加入少量氯化亚锡（０．５－２份）能显著促进自硫化反应，增大硫化速度和交联密度，共混物凝胶含量达到９８％，进一步增大氯化亚锡用量对共混物硫化和硫化胶性能无显著影响。ＢＲ／ＣＰＥ共混物用炭黑和白炭黑作补强剂较好，补强剂用量为３０份较合适；ＣＰＥ用量较大，共混物的物理性能较好。     

Cure characteristics and mechanical properties of styrene-butadiene rubber/hydrogenated acrylonitrile-butadiene rubber/silica composites

Composites of styrene butadiene rubber (SBR), hydrogenated acrylonitrile–butadiene rubber (HNBR) and silica were prepared. Sulfur (S), dicumyl peroxide (DCP) and a combination of S and DCP (M) were used as curing agents, respectively. The morphology of the composites with different blend ratio was examined to correlate with observations on mechanical properties by scanning electron microscopy. The effects of blend ratio and curing systems on the curing characteristics and mechanical properties, such as stress–strain behavior, tensile strength, elongation at break and hardness of SBR/HNBR/Silica composites, were studied. Composites prepared by M curing systems showed comparatively better mechanical properties, wet traction and rolling resistance than S and D curing systems. The tensile strength, tear strength, and elongation at break were improved by adding HNBR for M curing systems. The wet traction of the vulcanizates containing HNBR was better than that of the vulcanizates without HNBR. A relatively uniform dispersion of silica was observed for SBR/HNBR/silica compositions compared with SBR/silica composites.     

HNBR/EPDM blends: Covulcanization and compatibility

The covulcanization characteristics, mechanical properties, compatibility, and hot‐air aging resistance of hydrogenated nitrile‐butadiene rubber (HNBR)/ethylene‐propylene‐diene rubber (EPDM) blends cured with either sulfur or dicumyl peroxide (DCP) were studied. The difference between M_H and M_L (M_H ? M_L), rheometer graphs, selective swelling and a dynamic mechanical analysis of HNBR/EPDM blends confirmed that the peroxide curing system gives better covulcanization characteristics than the sulfur curing system and peroxide exhibited higher crosslink efficiency on EPDM while sulfur showed larger crosslink efficiency on HNBR. Dynamic mechanical analysis and morphology indicated that the compatibility between HNBR and EPDM is limited. Tensile strength and elongation at break of the sulfur‐cured blends are greater than those obtained with peroxide and increase with the HNBR fraction. The blends crosslinked with peroxide retain their tensile strength but not their elongation at break after hot air ageing better than blends vulcanized by sulfur. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

1,2-PBR和BR对EPDM硫化和力学性能的影响

考察了过氧化物硫化体系和硫黄硫化体系ＥＰＤＭ／１,２－聚丁二烯橡胶（１,２－ＰＢＲ）和ＥＰＤＭ／ＢＲ并用胶的硫化特性、交联密度和物理性质。结果表明：采用过氧化物硫化体系时,ＥＰＤＭ与１,２－ＰＢＲ和ＢＲ并用后,硫化胶的交联密度、１００％定伸应力、邵尔Ａ型硬度和撕裂强度增大,且前的增幅较大;采用硫黄硫化体系时,１,２－ＰＢＲ和ＢＲ均可提高ＥＰＤＭ的硫化速率,且随着１,２－ＰＢＲ用量的增大,硫化胶的     

助交联剂PDM和硫黄用量对CM/EPDM并用胶性能的影响

试验研究在过氧化物硫化体系下助交联剂N,N'-间亚苯基双马来酰亚胺(PDM)和硫黄用量对氯化聚乙烯橡胶(CM)/EPDM并用胶性能的影响.结果表明:在硫化剂DCP/助交联剂PDM硫化体系下,当硫化剂DCP用量为3份、助交联剂PDM用量为1.5～2份时,CM/EPDM并用胶的综合性能较好;在硫化剂DCP/硫黄硫化体系下,...     

EPDM硫化橡胶的热稳定性研究

对ＥＰＤＭ的过氧化物硫化、硫黄硫化和含硫化合物硫化以及两种不同硫化体系并用的硫化胶热稳定性进行比较，优选热稳定性较好的硫化体系用于产品的制造。采用过氧化二异丙苯（ＤＣＰ）硫化的硫化胶虽具有极好的热稳定性，但其耐撕裂性能较差，且价格较高。因此可考虑采用ＤＣＰ的并用硫化体系。当ＤＣＰ用量为５份，硫黄用量不超过１份时，硫化胶具有较好的热稳定性。     

硫化体系对EPDM／ACM共混胶性能的影响

研究了7种不同硫化体系对EPDM／ACM共混胶性能的影响。结果表明,采用DCP／TCY硫化体系硫化的共混胶,具有合适的正硫化时间和交联密度,拉伸强度接近最大值,为17．2MPa,撕裂强度最大,为38．5N／mm,压缩永久变形最小,为30．6％,耐热空气老化性能较好。DCP／TCY并用硫化体系为EPDM／ACM共混胶的最佳硫化体系。     

DMC补强EPDM/MVQ并用胶的性能研究

采用添加短纤维的不饱和聚酯（DMC）填充EPDM／基乙烯基硅橡胶（MVQ）并用胶。研究其物理性能和耐热老化性能。结果表明，添加DMC后。EPDM／MVQ并用胶的邵尔A型硬度和拉伸强度大幅提高，耐热老化性能较好，兼具EPDM，MVQ和DMC的优点。EPDM／MVQ并用胶的较优配方为：EPDM25，MVQ75，DMC80，白炭黑40，氧化锌5，防老剂D1，硫化剂DCP6，促进剂DM0．8。     

Morphology,rheology, and mechanical properties of dynamically cured EPDM/PP blend: Effect of curing agent dose variation

The structure development, rheological behavior, viscoelastic, and mechanical properties of dynamically cured blend based on the ethylene–propylene–diene terpolymer (EPDM) and polypropylene (PP) with a ratio of 60/40 by weight were studied. The variation of two‐phase morphology was observed and compared as the level of curing agent was increased. Meanwhile, as the level of curing agent increased, viscosity as a function of shear stress always increased at a shear stress range of 2.2 × 10⁴ to 3.4 × 10⁵ Pa at the temperature of 200°C, yet viscosity of the blend approached each other at high shear stress. Dynamic mechanical spectra at different temperatures show that dynamic modulus (E′) of the blend exhibits two drastic transitions corresponding to glass transition temperature (T_g) of EPDM and T_g of PP, respectively. In the blends T_gs of EPDM increase and T_gs of PP almost remain unchangeable with an increase in curing agent level. Tensile strength increased, yet elongation at break decreased as the level of curing agent is increased. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 357–362, 2004     

硫化体系对CM/EPDM共混胶性能的影响

研究了不同硫化体系及过氧化物硫化体系中硫化剂用量对CM/EPDM共混胶性能的影响。结果表明,过氧化物(DCP/S)硫化体系的胶料具有适宜正硫化时间和较好综合物理机械性能;采用RCAD配方优化设计中的均匀设计法进行了实验设计,并根据优选结果绘制了等高线图;在实验范围内,DCP比CAMV的影响显著;当DCP用量为2.8～4份且CAMV用量为3～5份时,共混胶硫化胶具有较高拉伸强度和撕裂强度、较低压缩永久变形和较好耐磨性能。