聚稳丁腈橡胶的研究

本文研究了丁二烯与丙烯腈聚合系统中,引入兼有防老和聚合双功能的化合物——苯胺基苯基甲基丙烯酰胺单体的工艺条件及共聚物(聚稳丁腈橡胶)的物理机械性能。实验结果表明,聚稳丁腈橡胶比普通丁腈橡胶具有较高的氧化稳定性和防老剂的不抽出性,并适应多种硫化,有良好的物理机械性能及卓越的耐老化性能。     

石墨/二硫化钼/丁腈橡胶复合材料的性能

采用机械共混法制备了石墨/二硫化钼(MoS2)/丁腈橡胶(NBR)复合材料,考察了石墨和MoS2用量对复合材料物理机械性能及摩擦性能的影响,并用扫描电子显微镜表征了填料在橡胶基体中的分散情况。结果表明,石墨/MoS2/NBR复合材料的拉伸强度、撕裂强度和邵尔A硬度均高于石墨/NBR复合材料和MoS2/NBR复合材料,当添加10份石墨和7份MoS2时,复合材料的物理机械性能最佳,且填料在橡胶基体中的分散性最好,摩擦因数达到最小值0.7。     

基于填料粒度对离合器摩擦材料性能影响的研究

本文提出采用丁腈乳胶改性酚醛树脂作粘结剂、采用玻璃纤维和复合包芯纱作为增强纤维、丁腈橡胶复合填料制备离合器摩擦材料的工艺方法。试验表,在相同配方和工艺条件下,复合填料的粒度对离合器摩擦材料的性能有很大影响。当复合填料粒度为20-60目左右时,摩擦材料具有较好的物理机械性能和良好的摩擦磨损性能。     

低门尼粘度Zhanber~ HNBR的对比试验研究

分别采用有机过氧化物硫化体系和有效硫化体系制备了低门尼粘度氢化丁腈橡胶(Zhanber,ZN35252、ZhanberZN35153和ZhanberZN43254)硫化试样,将其与市售低门尼粘度HNBR(牌号A和牌号B)进行了对比试验。结果表明,低门尼粘度氢化丁腈橡胶ZhanberHNBR的硫化工艺性能和物理机械性能可与后者相媲美,其混炼胶具有较低的门尼粘度和良好的加工性能。     

兰州石化NBR2805E结构与性能的对比研究

对比了丁腈橡胶NBR2805E与市场同类产品Nancar1043N、N41E、JSR 240S和Nancar2865的结构与性能关系。结果表明,NBR2805E与JSR240S、Nancar2865丙烯腈含量相当,顺式1,4-丁二烯结构含量低,反式1,4-丁二烯结构含量较高;玻璃化转变温度(Tg)从低到高的顺序依次是JSR240S、Nancar2865、NBR2805E、N41E、Nancar1043N,NBR2805E具有较好的耐低温性能和加工流动性能,硫化速度较慢,物理机械性能与JSR240S相当。     

开发新型的氢化丁腈橡胶

氢化丁腈橡胶 (HNBR)是在丁腈橡胶 (NBR)的碳 -碳双键中加氢产生氢化作用而得。氢化丁腈橡胶 (HNBR)的各项物理机械性能均要优于丁腈橡胶。该文通过对新开发的HNBR进行系统研究和开发 .阐述了HNBR的基本特性和与传统的NBR物理机械性能的对比优点。     

改性石墨/丁腈橡胶复合材料的性能

采用十六烷基三甲基溴化铵、硅烷偶联剂KH 570以及聚乙二醇分别对石墨表面进行了有机改性,通过机械共混法制备了改性石墨/丁腈橡胶复合材料,考察了改性剂种类以及改性石墨用量对复合材料物理机械性能及摩擦性能的影响,并用扫描电子显微镜表征了石墨在橡胶基体中的分散情况及复合材料磨损表面情况。结果表明,随着改性石墨用量的增加(20份以内),复合材料的物理机械性能有所上升,摩擦系数不断下降;3种改性剂中,KH 570改性石墨所制备复合材料的物理机械性能及摩擦性能较优,当添加20份KH 570改性石墨时,其在橡胶基体中分散较好,磨损表面最为光滑、平整,复合材料的物理机械性能最佳,摩擦系数达到最低值(0.7)。     

开发新型的氢化丁腈橡胶

氢化丁腈橡胶(HNBR)是在丁腈橡胶(NBR)的碳一碳双键中加氢产生氢化作用而得氢化丁腈橡胶(HNBR)的各项物理机械性能均要优于丁腈橡胶该文通过对新开发的HNBR进行系统研究和开发．阐述了HNBR的基本特性和与传统的NBR物理机械性能的对比优点。     

新型增塑剂Aflux25对氢化丁腈橡胶性能的影响

研究了新型增塑剂Aflux 25对氢化丁腈橡胶(HNBR)物理机械性能及耐热性能的影响.结果表明,与普通增塑剂TP-95相比,填充Aflux 25可在基本保持HNBR物理机械性能的同时,具有优异的热稳定性,且玻璃化转变温度几乎不受影响.     

丁腈橡胶/聚氯乙烯共沉胶与高温机械共混胶的性能对比

研究了并用聚氯乙烯对丁腈橡胶性能的影响,并对不同牌号丁腈橡胶/聚氯乙烯乳液共沉胶与高温机械共混方法生产的丁腈橡胶/聚氯乙烯共混胶的物理机械性能及工艺性能进行了对比。结果表明,丁腈橡胶并用聚氯乙烯可改善其耐臭氧及热空气老化等性能;乳液共沉胶与高温机械共混胶相比,共沉胶加工工艺简单,生产效率高,颜色较浅,适于制造浅色制品;高温机械共混胶物理机械性能稍优于乳液法生产的共沉胶。     

纳米二氧化锆增强丁腈橡胶力学性能的分子动力学模拟

采用分子动力学模拟的方法建立了纳米二氧化锆增强丁腈橡胶（NBR）复合材料的分子模型,对比分析了外部填充、原位填充以及原位填充且经过偶联化处理三种形态的二氧化锆对NBR力学性能的增强效果,从原子层面探讨了定子橡胶力学性能的内在增强机制。结果表明,相比于纯NBR,三种形态二氧化锆的引入均显著改善了NBR的力学性能。原位填充纳米二氧化锆的表面羟基与NBR形成氢键型偶极相互作用,表面活性偶联剂双-（3-三乙氧基硅烷丙基）四硫化物的加入进一步提供了与橡胶基质之间的化学桥接,从而大大提升了NBR基质的力学性能。与纯NBR体系相比,原位填充且经过偶联化处理的二氧化锆增强NBR的力学性能表现最佳,复合体系的杨氏模量、体积模量和剪切模量均提升得最多。通过界面结合能、非键合能、均方位移和扩散系数的计算,验证了纳米二氧化锆的添加改善了定子橡胶力学性能的结论。     

Acrylonitrile butadiene nanocomposites containing different clays by latex compounding method

Considering elastomers nanocomposites, most of the works are focused on natural rubber, styrene butadiene rubber and rubber blends, while few of them deal with nitrile butadiene rubber (NBR). This article presents the reinforcing effect of two raw sodic montmorillonites (Mts) and one organoclay on NBR matrix prepared by the latex compounding method. Raw Mts increase the mechanical properties of neat matrices. A pseudoplastic behavior is observed with the incorporation of clays into the NBR latex, indicating interactions between polymer chains and clay sheets, in agreement with the results of zeta potential analysis. X‐ray diffraction evaluates changes in the interlayer distance of the clay, indicating the NBR intercalation phenomenon in all cases. Matrices with different clay proportions present variations in the mechanical properties, depending if the aggregation phenomenon is promoted. Morphological analysis of clays and nanocomposites as well as thermal analysis were performed. The variation in mechanical properties after an aging process was studied, evaluating the effects on the tensile strength, ultimate strain and 300% modulus. POLYM. ENG. SCI., 59:736–744, 2019. © 2018 Society of Plastics Engineers     

Impacts of interfacial interaction on properties of melamine formaldehyde microsphere/rubber: I. filler dispersion and curing dynamic

Melamine formaldehyde microsphere (MF) was incorporated into nitrile butadiene rubber (NBR) and styrene butadiene rubber (SBR), respectively. The interaction between MF and rubber and effects of interfacial interaction on the dispersion of filler in rubber matrix, dynamic mechanical analysis, vulcanisation characteristics and kinetics were studied. The results showed that MF interacted with NBR through hydrogen bonds while there had no observed interaction between MF and SBR. The parameter b of MF/NBR calculated by the ratio of modulus and strains increased significantly, which demonstrated further the strong interaction between MF and NBR. For MF/SBR system, however, the parameter b changed slightly with little polymer–filler interaction. The Scanning Electron Microscope images released that strong polymer–filler interaction caused the uniform dispersion of MF in NBR matrix. The vulcanisation of MF/rubber was fitted by Ghoreishy’s model, and the addition of MF increased the rate of curing, shear modulus of compound and activity energy.     

Friction and wear properties of NBR/PVC composites

Acrylonitrial butadiene rubber (NBR)/Polyvinyl chloride (PVC) composites with different PVC content were prepared. The effect of PVC content on the mechanical strength and tribological properties of the NBR/PVC composites was investigated. The morphologies of the worn traces and debris of NBR/PVC composites and worn traces of mating ball were observed using a scanning electron microscope (SEM). It was found that the friction and wear of NBR/PVC was lower than that of NBR without PVC. The NBR/PVC composite with 30% PVC content showed the best synthetic mechanical and tribological properties. The inferior elastic properties and the lesser deformation under the applied load of composites with PVC resulted in hysteric force and adhesion force decrease, which leading to a lower friction and wear of NBR/PVC composites. The frictional failure unit of NBR70/PVC30 composite being smaller should be an important reason of the wear of the composite being lowest. The lubricating effect of PVC played an important role in decreasing the friction coefficient and wear of NBR/PVC composites. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Aluminum silicate fibers impregnated acrylonitrile butadiene rubber composites: Ablation,thermal transport/stability,and mechanical inspection

Variant concentrations of ceramic fibers (CerFs) were incorporated into acrylonitrile butadiene rubber (NBR) to fabricate elastomeric ablative composites for ultrahigh temperature applications. The CerFs introduction into the polymer matrix has enhanced the ablation resistance up to 59% and successfully reduced the backface temperature of the polymer composite up to 110^oC during the ultrahigh temperature ablation investigation. Thermal decomposition of the polymer composites was diminished up to 10% with increasing fiber concentration in the rubber matrix. Thermal conductivity was reduced equal to 63% while thermal impedance was enhanced up to 84% with the utmost fiber incorporation into the NBR matrix. The CerFs have adversely affected the mechanical properties of NBR matrix due to their brittle/inert nature and weak interface bonding with the host matrix. Scanning electron microscopy along with the energy dispersive x‐ray spectroscopy was used to examine the ablated specimens and the fiber dispersion within the host matrix. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4392–4400, 2013     

Characterization of barium titanate reinforced acrylonitrile butadiene rubber composites for flexible electronic applications: influences of barium titanate content

The aim of this study was to develop high dielectric constant flexible polymers with a highly efficient and cost‐effective approach using acrylonitrile butadiene rubber (NBR) as the polymer matrix and barium titanate (BT) as the high dielectric constant filler. The BT powder was synthesized with a solid‐state reaction and was characterized using a particle size analyzer, XRD, SEM and Fourier transform infrared spectroscopy. NBR/BT composites were fabricated using an internal mixer with various BT loadings up to 160 phr. The influence of BT loading on the cure characteristics and mechanical, dynamic mechanical, thermal, dielectric and morphological properties was determined. The incorporation of BT in the NBR matrix shortened scorch time and increased delta torque. The mechanical properties, thermal stability and dielectric constant were greatly improved and increased with BT loading. The results suggest that the reinforcement effect was achieved due to strong hydrogen bonding or polar–polar interactions between NBR matrix and BT filler. This is further corroborated by the good dispersion of BT filler in the NBR matrix observed with SEM imaging. These findings can be applied to produce high‐performance dielectric elastomers. © 2020 Society of Industrial Chemistry     

MWCNT/Hectorite hybrid filled acrylonitrile butadiene rubber/ ethylene-co-vinyl acetate blend nanocomposites: preparation and properties

Multiwalled carbon nanotube/hectorite hybrid filler (HMH) was prepared by simple dry grinding method. It was subsequently used for the reinforcement of technologically compatible acrylonitrile butadiene rubber (NBR)/ ethylene-co-vinyl acetate (EVA) blend through solution intercalation method. Analysis of the prepared blend nanocomposites confirms homogeneous dispersion of the constituent fillers in the polymer matrix and significant interaction between two types of constituent fillers. Mechanical properties of NBR/EVA blend are significantly improved with HMH content up to 4 wt.% followed by reversion. Maximum improvement observed in tensile strength, elongation at break and toughness are 106%, 37% and 171% respectively without significant rise in Young’s modulus. Results also show best dynamic mechanical and dielectric response at 4 wt.% and 3 wt.% HMH content respectively. Enhanced mechanical, dynamic mechanical and dielectric properties of the blend nanocomposites attained may be attributed to fair degree of compatibility between the two polymer matrices, homogeneous dispersion of fillers and improved polymer-filler interaction.     

Studies on conductivity of nitrile rubber and its blends with NR,EPDM, and PVC

Abstract

Nitrile/butadiene rubber has been made electrically conducting by the incorporation of acetylene black. The change in conductivity and mechanical properties with varying amounts of acetylene black was studied. Nitrile rubber was blended with NR, PVC, and EPDM and their conductivity and mechanical properties were determined after incorporation of acetylene black. On comparison it was found that NBR-NR blends are more conducting than NBR-PVC and NBR-EPDM blends. Blends of NBR-NR containing varying amounts of NR and NBR were prepared with the same amount of acetylene black, and their properties were also studied. A blend of 80:20 NBR/NR was studied in detail by varying the concentration of acetylene black. It was found that electrical conductivity depends on the degree of dispersion of acetylene black in the polymer matrix.     

温度对酚醛树脂/丁腈橡胶复合材料摩擦学性能的影响

采用机械共混法将酚醛树脂（PF）与丁腈橡胶（NBR）进行混合而制得PF/NBR复合材料,研究了PF用量对NBR的拉伸性能、撕裂性能及硬度的影响,使用多功能材料表面性能综合测试仪、三维表面形貌仪和扫描电子显微镜对力学性能最优的PF/NBR复合材料试样A 2（添加5份PF）在不同温度下的摩擦性能进行了探究,并与未添加PF的试样A 0进行了对比,此外还对PF/NBR复合材料的磨损机理进行了初步分析。结果表明,当温度超过75 ℃时,试样A 0的摩擦系数曲线整体呈持续上升的趋势,同时其表面有较多孔洞,分子间结合力下降,耐磨性变差,而试样A 2的摩擦系数则基本保持稳定,磨损行为表明其磨损机理由磨粒磨损逐渐转变为黏着磨损;相对于试样A 0而言,试样A 2在高温下仍能保持较好的摩擦性能。     

ETPI改性PVC性能的研究

研究了反式-1,4-聚异戊二烯(TPI)及环氧化反式-1,4-聚异戊二烯(ETPI)对聚氯乙烯(PVC)性能的影响,并与丁腈橡胶、粉末丁腈橡胶、氯化聚乙烯改性PVC做了比较。结果表明:不同环氧度的ETPI均对PVC有明显的增韧作用;与丁腈橡胶、粉末丁腈橡胶、氯化聚乙烯相比,环氧基摩尔分数为25%的ETPI对PVC的增韧效果最显著。