硅橡胶／三元乙丙橡胶共混研究

对甲基乙烯基硅橡胶（１１０－２）／三元乙丙橡胶共混的相容性和共硫化进行了研究，探讨了共混比例，填料、助剂，工艺条件等对共混胶力学性能的影响。结果表明，提高共混胶的相容性和共硫化是获得产品优异性能，从而使这一新型材料在新的领域广泛应用的关键。     

硫黄硫化体系对IIR/EPDM共混胶力学性能的影响

研究IIR/EPDM体系中共混比、硫黄硫化体系对其共混胶性能的影响。结果表明 ,IIR与EPDM共混相容性较好 ,可以达到共硫化 ;IIR/EPDM共混比为 75 /2 5时共混胶性能最好 ;用传统硫化体系 (CV)、有效硫化体系 (EV)和半有效硫化体系 (SEV)都能得到性能较好的共混胶 ,其中以CV体系的硫化胶性能最好。     

HNBR／NBR共混物性能研究

对ＨＮＢＲ／ＮＢＲ共混的相容性和硫化体系进行了研究,探讨了共混比、填料等对共混胶静态力学性能的影响以及不同共混比胶料的动态力学性能,并分析了共混胶的加工性能。结果表明：选择适当的硫化交联剂,提高共混胶的共硫化是获得优异性性能的关键。甲基丙烯酸镁（ＭＭＧ）对共混胶有明显的增硬作用,并可适当改善共混胶的物理机械性能和耐热老化性能。共混胶有着较好的加工性能,并可降低混炼胶料的成本     

氧化石墨烯增容及增强羧基丁腈橡胶/丁苯橡胶共混物（英文）

制备了氧化石墨烯/羧基丁腈橡胶/丁苯橡胶共混硫化胶,研究了氧化石墨烯对硫化胶的相容性和力学性能的影响。结果表明,氧化石墨烯可有效改善共混硫化胶的相容性,当氧化石墨烯用量为0.3份(质量)时,共混硫化胶的力学性能达到最佳,100%定伸应力、300%定伸应力、拉伸强度和撕裂强度分别提高了44%、107%、71%和94%。     

三元乙丙橡胶/丁腈橡胶共混胶的相容性和共硫化性研究进展

从如何提高相容性和共硫化性两方面总结了近年来三元乙丙橡胶/丁腈橡胶共混胶的研究进展。     

EPDM／甲基乙烯基硅橡胶共混工艺

提高ＥＰＤＭ的混炼温度，加入少量活性剂，再加入甲基乙烯基硅橡胶的共混工艺，与常温共混工艺相比，增加了ＥＰＤＭ与ＶＭＱ的相容性。实验结果表明，该工艺使共混胶胶相结合细微均匀，减小了ＥＰＤＭ与ＶＭＱ硫化速度的差距，降低了共混硫化胶的ｔｇδ，提高了硫化胶的拉伸强度、定伸应力和体积电阻率、降低了永久变形和压缩永久变形。     

HNBR/EPDM共混胶性能的研究

考察了过氧化二异丙苯（DCP）并用助交联剂三烯丙基异氰脲酸酯（TAIC）,三烯丙基氰脲酸酯（TAC）和N,N′-间苯撑双马来酰亚胺（HVA-2）和硫黄硫化体系对不同共混比的HNBR/EPDM共混胶力学性能的影响,并分析了两种橡胶的共硫化特性和相容性。结果表明,硫黄硫化胶的拉伸强度和拉断伸长率明显高于过氧化物硫化胶。过氧化物硫化EPDM时有较高硫化效率,而硫黄硫化HNBR时有较高硫化效率。在过氧化物硫化体系下,助交联剂TAIC,TAC和HVA-2对共混胶力学性能的影响差异不大;HNBR和EPDM为不相容体系,但在过氧化物硫化体系下有较好共硫化性。     

溴化丁基橡胶/氯化丁基橡胶并用胶的制备及性能

用差示扫描量热仪测定了溴化丁基橡胶/氯化丁基橡胶(BIIR/CIIR)共混胶的玻璃化转变温度,研究了不同并用比(质量比)共混胶的相容性、硫化特性以及力学性能和热稳定性。结果表明,不同并用比的BIIR/CIIR共混胶仅有1个玻璃化转变温度,表明BIIR和CIIR具有良好的相容性;BIIR的焦烧时间比CIIR短,共混胶的焦烧时间介于BIIR和CIIR之间,而正硫化时间比BIIR和CIIR都长;共混硫化胶的拉伸强度、撕裂强度均优于BIIR和CIIR硫化胶,热稳定性与BIIR相当;当BIIR/CIIR的并用比为80/20时,共混硫化胶的综合性能最好。     

相容剂对混炼型聚氨酯橡胶/丁腈橡胶共混胶性能的影响

以丙烯酸酯橡胶（ACM）和乙烯丙烯酸酯橡胶（AEM）作为相容剂,研究其对混炼型聚氨酯橡胶（MPU）/丁腈橡胶（NBR）共混胶性能的影响。结果表明：在MPU/NBR共混胶中加入相容剂ACM和AEM,可以促进MPU与NBR的共硫化,使二者的硫化特性更加匹配,提高了共混胶的相容性、物理性能、耐热性能和耐热氧老化性能,相容剂AEM对共混胶的性能改善效果优于相容剂ACM;当相容剂AEM用量为20份时,共混胶的两相已完全相容。     

硅橡胶/氟橡胶共混胶的硫化及热稳定性

采用机械共混法制备了质量比为10/90的硅橡胶/氟橡胶共混胶,研究了共硫化体系和硫化条件对其力学性能的影响,并通过傅里叶变换红外光谱分析了其化学组成,通过动态力学分析研究了其结构相容性,用热重法探讨了其热稳定性。结果表明,最佳的共硫化体系为过氧化二异丙苯/三烯丙基异三聚氰酸酯体系,一段硫化宜为温度170℃、压力10 MPa、时间30 min,二段硫化宜为温度200℃、时间6 h。在共混胶中硅橡胶与氟橡胶存在部分的相容性;少量硅橡胶的加入可以拓宽氟橡胶的使用温度,使其耐热性能有所提高,耐低温性能有所改善。     

Enhancing silica dispersion and interfacial interaction in styrene butadiene/silica rubber composites by using epoxidized styrene butadiene rubber as interfacial compatibilizer

It is usually desired but often challenging to improve the wet traction, and reduce the abrasion and rolling resistance simultaneously in tread rubber, which is referred to as “magic triangle” in tire industry. To fulfill this goal, the filler dispersion and interfacial interaction required to be improved, as they are two essential factors to concurrently govern the ultimate properties of rubber composites. Herein, we synthesized the epoxidized solution polymerized styrene butadiene rubber (ESSBR) with different epoxy level, and used them as interfacial compatibilizer to promote the silica dispersion and silica/rubber interfacial interaction. The epoxy of ESSBR would react with silanol on silica surface and co-crosslink with SSBR simultaneously, therefore build a strong bridge between rubber matrix and filler. By incorporation of 20 phr of ESSBR-15% (15% of double bonds on main chain was epoxidized), the wet grip was improved by 40%, and DIN abrasion and rolling resistance were reduced by 38% and 21%, respectively with hardly sacrifice the mechanical properties. We envisage that this study provides an approach for the fabrication of rubber composites with improved silica dispersion and strengthened interfacial interaction.     

再生丁基橡胶与非极性不饱和橡胶共混物的性能研究

对再生丁基橡胶(RIIR)与非极性不饱和橡胶共混物的性能进行了研究。结果表明,RIIR易以填料的形式加入到非极性不饱和橡胶中使用,当RIIR以填料的形式加入到NR、BR及SBR中时,不仅使它们的耐热氧老化性及耐屈挠龟裂性得到明显改善,而且使NR及BR的撕裂强度及扯断伸长率提高;RIIR作为生胶与BR及NR共混,可改善BR的耐热氧老化性,提高NR的撕裂强度;SBR与RIIR共混,均使拉伸强度及撕裂强度降低;非极性不饱和二烯类橡胶与RIIR共混后,均使耐磨性降低。     

白炭黑在NR/BR共混体系中的偏析

通过改变混炼工艺,研究了白炭黑在天然橡胶/顺丁二烯橡胶(NR/BR)共混体系中的偏析,结果表明:混炼工艺会导致白炭黑在NR/BR各相中出现偏析,进而导致并用胶的性能出现较大差异;采用先将白炭黑加入BR制成母炼胶,再与NR共混的混炼工艺,所得胶料中白炭黑主要偏析到BR相中,填料网络结构少,Payne效应低,白炭黑的分散性好,对胶料的补强效果较其它混炼工艺好。     

过氧化物交联聚烯烃弹性体的性能

采用过氧化物交联，讨论了交联剂、共交联剂、补强填充剂以及增地采用茂金属催化剂合成的乙烯－辛烯共聚物（ＰＯＥ）的物理机械性能的影响。和过氧化物交联后，ＰＯＥ的拉伸强度、扯断伸长率和扯断永久变形大幅度下降。加入共交联剂，可以提高交联程度，缩短硫化时间。加入炭黑，可以起到补强作用。提高１００％定伸应力、撕裂强度、伸强度和硬度，减小扯断伸长率和扯断永久变形。加入增塑剂降低了某些力学性能，但扯断伸长率增加，     

甲基丙烯酸锌与炭黑共同补强天然橡胶的研究

在开放式炼胶机上,分别以直接添加和原位生成2种方法向天然橡胶(NR)基体中添加甲基丙烯酸锌(ZDMA),制备了2种类型的ZDMA与炭黑共同补强的NR硫化胶,X射线衍射(XRD)分析证实,成功制备了ZDMA。扫描电镜(SEM)研究表明,原位生成ZDMA硫化胶的断面比直接添加ZD-MA硫化胶的粗糙很多,表现出更强的界面结合力。力学性能研究表明,用ZDMA部分替代炭黑,可以有效提高硫化胶的力学性能。在相同添加量下,原位生成ZDMA硫化胶的力学性能优于直接填充ZD-MA硫化胶的。     

低温耐油橡胶的研究进展

综述了低温耐油橡胶的研究进展,研究主要集中在对硅橡胶、氟橡胶、丁腈橡胶和氯醚橡胶等胶种进行化学改性和物理共混,改善橡胶的性能达到橡胶制品的性能要求。通过化学改性后得到的氟硅橡胶、氟醚橡胶、氟化磷腈橡胶、氢化丁腈橡胶、共聚氯醚橡胶等兼具良好的耐油和耐寒性能。此外,通过不同胶种的并用,可起到取长补短的作用,并选择合适的配合体系,也可满足一定制品的要求。     

4种网格结构模具用硅橡胶性能研究

分析了网格结构模具用4种不同的室温硫化硅橡胶的性能结果表明,该4种硅橡胶均具有较小的线收缩率及较长的凝胶时间,但加成型室温硫化硅橡胶较缩合型硅橡胶具有突出的室温力学性能、热稳定性及热线胀性能,完全满足用于制作网格模具的硅橡胶要求.     

Microwave absorbing rubber composites containing carbon black and aluminum powder

Natural rubber (NR), epoxidized natural rubber (ENR), and chlorosulfonated polyethylene (CSM) composites filled with conductive carbon black and aluminum powder have been prepared by using a two‐roll mill. An electromagnetic interference shielding effectiveness of those rubber composites was carried out in the frequency range of 8–12GHz (X‐band microwave). The increase of filler loading enhanced shielding effectiveness of the rubber composites. Conductive carbon black was more effective in shielding than aluminum powder. Binary filler‐filled rubber composites showed higher shielding effectiveness than that of single filler‐filled rubber composites. It has been observed that the shielding effectiveness of these rubber composites could be ranked in the following order: ENR ≥ CSM > NR, whereas the mechanical properties of the rubber composites were in the order of CSM > ENR > NR. The correlation between shielding effectiveness and electrical conductivity as well as mechanical properties of the rubber composites are also discussed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

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.     

Cure characteristics and mechanical properties of short nylon fiber‐reinforced nitrile rubber composites

Acrylonitrile butadiene rubber (NBR)‐based composites were prepared by incorporating short nylon fibers of different lengths and concentration into the matrix using a two‐roll mixing mill according to a base formulation. The curing characteristics of the samples were studied. The influence of fiber length, loading, and rubber crosslinking systems on the properties of the composites was analyzed. Surface morphology of the composites has been studied using Scanning Electron Microscopy (SEM). Addition of nylon fiber to NBR offers good reinforcement, and causes improvement in mechanical properties. A fiber length of 6 mm was found to be optimum for the best balance of properties. It has been found that at higher fiber loadings, composites show brittle‐type behavior. Composites vulcanized by the dicumyl peroxide (DCP) system were found to have better mechanical properties than that by the sulfur system. The swelling behavior of the composites in N,N‐dimethyl formamide has been analyzed for the swelling coefficient values. Composites vulcanized in the DCP system were found to have higher rubber volume fraction than that in the sulfur system, which indicates better rubber–fiber interaction in the former. The crosslink densities of various composites were also compared. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1023–1030, 2004