改善三元乙丙橡胶耐油性能的研究

研究氯化聚乙烯(CPE)、丁腈橡胶(NBR)与三元乙丙橡胶(EPDM)并用对共混胶力学性能和耐油性能的影响。结果表明,在EPDM/CPE共混胶中随CPE用量的增加,硫化胶的硬度、拉伸强度、撕裂强度和定伸应力呈现上升趋势、在ASTM3号油中浸泡后体积变化率变化不明显;在EPDM/NBR共混胶中随NBR用量的增加,硫化胶的拉伸强度、撕裂强度和定伸应力呈现下降趋势、在油中体积变化率明显减小;在EPDM/NBR/CPE共混胶中随NBR和CPE用量的增加,硫化胶的力学性能变化不明显,但在油中浸泡体积变化率明显降低,通过电镜照片对共混胶断面分析得知CPE的加入明显改善了EPDM和NBR之间的相容性。     

弹性体增容NR/EPDM共混胶性能的研究

采用动态硫化法制备NR/EPDM/POE热塑性弹性体来增容NR/EPDM共混胶,通过改变增容剂的含量研究NR/EPDM共混胶的力学性能、微观形态性能、耐热性能。结果表明,随着弹性体增容剂的增加,NR/EPDM共混胶的拉伸性能、撕裂性能、硬度都有上升趋势,拉断伸长率无明显变化;在NR/EPDM中添加20份弹性体增容剂,可以达到较高的力学性能和耐热空气、耐臭氧老化性能。     

原位生成甲基丙烯酸钠补强NBR/EPDM并用胶的性能研究

研究原位反应生成甲基丙烯酸钠(NaMAA)对采用不同共混方式混炼的NBR/EPDM并用胶性能的影响.结果表明,NBR与EPDM共混后,随着NaMAA理论生成量的增大,硫化胶的邵尔A型硬度、定伸应力和撕裂强度等均不断增大,拉伸强度在NaMAA理论生成量为40份时达到最大值,为31.8 MPa.与EPDM母胶法制备的并用胶相比,直接法NBR/EPDM并用胶共混性能较好,物理性能更佳.     

丁腈橡胶/三元乙丙橡胶共混胶的制备与性能

将不同质量比的丁腈橡胶(NBR)和三元乙丙橡胶(EPDM)制备共混胶,考察了增容剂碳纳米管(CNTs)和马来酸酐接枝三元乙丙橡胶(EPDM-MAH)、助交联剂三烯丙基异三聚氰酸酯(TAIC)、甲基丙烯酸锌(ZDMA)和三羟甲基丙烷三甲基丙烯酸酯(PL-500)对NBR/EPDM共混胶物理机械性能的影响,研究了共混胶的相容性。结果表明,随着EPDM用量的增加,共混胶的拉伸强度和撕裂强度均降低,邵尔A硬度提高,NRB/EPDM适宜质量比为70/30;分别加入助交联剂TAIC、PL-500、ZDMA和增容剂CNTs均可使NBR/EPDM共混胶的拉伸强度提高,加入EPDM-MAH对共混胶的拉伸强度没有影响,同时加入ZDMA和CNTs可使共混胶的相容性和综合性能提高幅度最大;分别加入ZDMA和CNTs可改善NBR与EPDM的相容性,NBR/EPDM共混胶中粒子分散均匀,界面未出现分层现象。     

NBR/CM并用胶性能的研究

研究了在过氧化物硫化体系和硫黄硫化体系下,丁腈橡胶(NBR)/氯化聚乙烯橡胶(CM)并用比对力学性能、老化性能和耐油性能的影响.结果表明,随着CM用量的增加,过氧化物硫化胶的拉伸强度、100%定伸应力及硬度均呈增大趋势,而拉断伸长率、撕裂强度和压缩永久变形都略有增大;硫黄硫化胶的拉伸强度、拉断伸长率和撕裂强度均变化不大...     

改善丁腈橡胶仨元乙丙橡胶并用胶相容性的研究

研究氯化聚乙烯（CPE）和甲基丙烯酸锌（ZDMA）对丁腈橡胶（NBR）／三元乙丙橡胶（EPDM）并用胶相容性和物理陛能的影响。结果表明：随着CPE用量增大,NBR／EPDM并用胶的硬度、100％定伸应力、拉伸强度和撕裂强度呈增大趋势;随着ZDUA用量增大,NBR／EPDM并用胶的硬度、100％定伸应力和撕裂强度呈增大趋势,ZDMA用量过大导致胶料的拉伸强度等物理陛能下降,ZDMA用量以5～10份为宜;添加CPE或ZDMA,EPDM／NBR并用胶的相容性得到明显改善,zDMA在NB眦PDM并用胶中起补强和增容的作用。     

增容剂对CR/BR共混物相容性及性能的影响

本论文主要通过将4种增容剂CPE、NBR、BIIR、CIIR分别与CR/BR共混物制成混炼胶裁样、硫化、测性能的方式研究了增容剂对CR/BR共混物的相容性及其硫化胶性能的影响。结果表明：CR/BR共混物微观形态的SEM照片表明增容剂很好的改善了CR/BR共混物形态均匀性;其混炼胶焦烧时间延长,硫化速度加快,胶料流动性变好,但交联密度降低;硫化胶力学综合性能得到提升,拉伸强度、拉断伸长率和撕裂强度增加,定伸应力下降,硬度减小,弹性增加,耐热老化性提高。但尤以增容剂CIIR增容效果最好,有效的改善了共混橡胶的加工性能和使用性能。     

NBR/CM并用胶料的性能及相容性研究

主要研究了NBR/CM不同配比共混胶料的力学性能、耐老化性能、耐高温性能和二者相容性。结果表明,随着CM含量的增加,NBR/CM硫化胶的拉伸强度、撕裂强度、拉断伸长率、100%定伸应力、硬度和压缩永久变形都有小幅度增加;耐老化性能得到改善;热失重分析表明,CM的加入改善了NBR的高温热稳定性;SEM和DMA分析都表明了NBR/CM具有良好的相容性。     

无机填料对CM/NBR共混胶性能的影响

研究了陶土、碳酸钙、高岭土及蒙脱土对CM/NBR共混胶性能的影响。结果表明,加入陶土可导致共混胶焦烧时间缩短,正硫化时间延长,拉伸强度、拉断伸长率和撕裂强度均增大;当陶土用量超过10份时,填料与橡胶结合形成填料网络,共混胶耐油性能提高。RPA分析结果表明,碳酸钙、高岭土和蒙脱土分别填充的CM/NBR共混胶Payne效应依次增强。随着碳酸钙、高岭土及蒙脱土用量的增大,共混胶硬度、门尼粘度、磨耗体积和定伸应力均增大,拉伸强度和撕裂强度却下降。高岭土填充的CM/NBR共混胶物理机械性能下降最小。     

氯化聚乙烯用量对三元乙丙橡胶/尼龙共混胶性能的影响

研究了增容剂氯化聚乙烯（CPE）的用量对三元乙丙橡胶/尼龙（EPDM/PA）硫化胶热空气老化前后和用非极性油处理后力学性能及耐磨性能、耐油性能的影响。结果表明,随着CPE用量的增大,EPDM/PA硫化胶热空气老化后拉伸强度和100%定伸应力呈上升趋势,扯断伸长率和永久变形均缓慢下降,邵尔A硬度保持不变。用非极性油处理后EPDM/PA硫化胶的拉伸强度和扯断伸长率随CPE用量的增大呈上升趋势,100%定伸应力基本不变。CPE的加入对硫化胶的拉伸强度、撕裂强度、扯断伸长率等性能有一定的提高,说明EPDM和PA两相的相容性改善,在用量为6份时硫化胶的力学性能较佳。随着CPE用量的增大,DIN磨耗呈下降趋势,耐磨性能提高;质量变化率和体积变化率略有降低,耐油性能有所提高。     

Nanomodified fillers in chloroprene‐rubber‐compatibilized natural rubber/acrylonitrile–butadiene rubber blends

Because of the structural dissimilarity, natural rubber (NR) and acrylonitrile–butadiene rubber (NBR) are immiscible, and compatibilizers are used during their blending. Neoprene or chloroprene rubber (CR) has a polar chlorine part and a nonpolar hydrocarbon part. Also, it has many advantageous properties, such as oil resistance, toughness, a dynamic flex life, and adhesion capacity. Hence, it is not less scientific to use CR as a compatibilizer in the blending of NBR with NR. Because many fewer studies on the use of neoprene as a compatibilizer in NR–NBR blend preparation are available, efforts were made to prepare 20:80 NR–NBR blends with CR with the aim of studying the effect of poly(ethylene oxide) (PEO)‐coated nano calcium silicate along with nano N‐benzylimine aminothioformamide and stearic acid coated nano zinc oxide in the sulfur vulcanization of the blends. The optimum dosage of the compatibilizer was derived by the determination of the tensile properties, tear resistance, abrasion resistance, compressions set, and swelling values. The tensile strength, tear resistance, and abrasion resistance of the gum vulcanizates of the blend were improved by the compatibilizing action of CR up to 5 parts per hundred parts of rubber (phr). In the case of the filled vulcanizates, the tear resistance, 300% modulus, hardness, and abrasion resistance increased with increasing dosage of nano calcium silicate. The elongation at break percentage decreased as expected when there was an increase in the modulus. Scanning electron microscopy was used to study the phase morphology of the blends. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Ethylene vinyl acetate as compatibilizer on cure characteristics and mechanical properties of (natural rubber)/(Recycled acrylonitrile‐butadiene rubber) blends

Ethylene vinyl acetate (EVA) has been used as a compatibilizer for (natural rubber)/(recycled acrylonitrile‐butadiene rubber) (NR/NBRr) blends, vulcanized by sulfur. EVA offers excellent heat, ozone, and weather resistance, whereas the vinyl acetate groups provide oil resistance to the blend. It exhibits good tear resistance and may be crosslinked. However, EVA exhibits poor low‐temperature flexibility. NBR gloves have excellent resistance to punctures, tears, and many types of chemicals, while NR has good physical and mechanical properties. NR/NBRr blends were prepared with various compositions with the EVA content fixed. Tensile properties, hardness, and swelling behavior tests were performed to determine the compatibility of NR/NBRr blends in the presence of EVA. Results indicated that incorporation of EVA into NR/NBRr blends improved tensile strength, modulus, and elongation at break compared with NR/NBRr blends without EVA. The improvement in hardness and reduction in resilience on compatibilization are due to an increase in crosslink density, which gives NR/NBRr blends better swelling resistance. Scanning electron microscopy of the fracture surfaces indicates that, with the addition of EVA in NR/NBRr blends, better adhesion between NR and NBRr was obtained, thus improving the compatibility of NR/NBRr blends. J. VINYL ADDIT. TECHNOL., 23:135–141, 2017. © 2015 Society of Plastics Engineers     

Cure characteristics,morphology, and mechanical properties of ethylene–propylene–diene–monomer rubber/acrylonitrile butadiene rubber blends

Blends based on ethylene–propylene–diene monomer rubber (EPDM) and acrylonitrile butadiene rubber (NBR) was prepared. Sulfur was used as the vulcanizing agent. The effects of blend ratio on the cure characteristics and mechanical properties, such as stress–strain behavior, tensile strength, elongation at break, hardness, rebound resilience, and abrasion resistance have been investigated. Tensile and tear strength showed synergism for the blend containing 30% of NBR, which has been explained in terms of morphology of the blends attested by scanning electron micrographs. A relatively cocontinuous morphology was observed for 70 : 30, EPDM/NBR blend system. The experimental results have been compared with the relevant theoretical models. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

超临界二氧化碳发泡EPDM/LDPE热塑性弹性体微孔泡沫

本文通过熔融共混制得了EPDM/LDPE热塑性弹性体,压制标准试样,然后使用超临界二氧化碳作为发泡剂在高压反应釜中进行物理发泡。通过万能拉力机测试了弹性体力学性能,用扫描电镜观察了拉伸断面和泡孔的微观结构。结果表明：DCP硫化体系的热塑性弹性体的综合力学性能要优于硫黄硫化体系,随着硫化剂用量的增多,拉伸强度和撕裂强度有一个最大值,硬度上升;橡塑比在4:6时,力学性能达到最佳,最大拉伸强度为7.5MPa,最大撕裂强度为27.6MPa。扫描电镜观察其拉伸断面形貌,表明EPDM橡胶相与LDPE塑料相呈现“海-岛”两相微观结构;泡孔大小均匀性较好,成功制备了微米级微孔泡沫且泡孔大小分布均匀。     

官能化高乙烯基聚丁二烯橡胶与丁腈橡胶共混胶的性能

以氢化钠为活性剂、马来酸酐为改性剂,通过负离子反应对高乙烯基聚丁二烯橡胶(HVBR)进行官能化改性制备了官能化HVBR(FHVBR)。考察了FHVBR与丁腈橡胶(NBR)共混的质量比对FHVBR/NBR共混胶硫化特性、力学性能、耐热氧老化性能和电性能的影响,并通过差示扫描量热仪和扫描电子显微镜探讨了共混胶的两相相容性。结果表明,随着NBR用量的增加,FHVBR/NBR共混胶的硫化时间缩短、硫化效率提高,定伸应力和硬度增大,耐老化性能得以改善。NBR用量的增加使得FHVBR/NBR共混胶对不同频率下的微波吸收能力增强,共混胶的电阻率下降,导电性增强。然而,NBR用量增加导致共混胶的拉伸强度略有下降。     

用回归分析法研究乙丙橡胶的性能及应用

用回归分析方法研究了快压出炭黑(FEF)和石蜡油两因素三变量对EPDM胶料性能的影响。结果表明,在实验范围内随着FEF用量的增加,拉伸强度、硬度、100%和300%定伸应力均呈增加的趋势,撕裂强度先增大后减小;回弹性、拉断伸长率和压缩永久变形均减小。随着石蜡油用量的增加,拉伸强度、100%和300%定伸应力、撕裂强度均减小,拉断伸长率和压缩永久变形增大,回弹性没有明显变化。采用回归分析法建立的数学模型可以准确地预测胶料的各项物理性能以及与配合剂用量之间的关系。     

A study on the compatibility and physical properties of chlorinated polyethylene rubber/nitrile rubber blends

The miscibility and some physicomechanical characteristics of chlorinated polyethylene rubber (CPE) and nitrile rubber (NBR) blends have been investigated. Calculation of the heat of mixing, differential scanning calorimetry, and scanning electron microscopy analysis showed that CPE was miscible with NBR in all proportions. The cure and scorch times decreased with the increase in NBR content, whereas the maximum torque increased. The tensile strength, 100% modulus, elongation at break, tear strength, and compression set decreased with increasing of NBR content. After aging, hardness and tensile strength increased, and there was no drastic change in elongation at break on aging. The thermal aging resistance and the abrasion resistance of NBR are improved after blending with CPE, but the oil resistance decreased. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011