石墨烯在6~35kV乙丙绝缘橡胶电缆可剥离外屏蔽材料中的应用

研究了不同组分和不同预分散方法下,石墨烯对电压等级6~35 kV乙丙绝缘橡胶电缆可剥离外屏蔽料电性能、物理性能以及加工性能的影响。结果表明,在EVM/NBR屏蔽料中加入石墨烯,胶料的导电性能、门尼黏度和剥离性能最佳。石墨烯的混炼采用常规工艺即可。     

三元乙丙橡胶/氯磺化聚乙烯橡胶并用胶的性能研究

研究相容剂氯化聚乙烯(CPE)和乙烯-乙酸乙烯酯(EVM)以及助交联剂甲基丙烯酸锌(ZDMA)和三(甲基丙烯酸)三羟甲基丙烷酯(TMPTMA)对三元乙丙橡胶(EPDM)/氯磺化聚乙烯橡胶(CSM)并用胶性能的影响。结果表明:随着CSM用量增大,EPDM/CSM并用胶的拉伸强度减小,EPDM与CSM相容性变差;加入相容剂CPE或EVM以及助交联剂ZDMA或TMPTMA后,并用胶的物理性能提高,EPDM与CSM相容性改善,其中,助交联剂ZDMA的改善效果最佳。     

氯化聚乙烯/丁腈胶并用的研究

研究了硫化体系、并用比和填料对NBR/CPE并用胶性能的影响,也研究了CPE的稳定。结果表明:使用给硫体(TMTD)硫化体系的并用胶具有较好的物理机械性能,硫黄(S) NA—22硫化体系的并用胶则有较佳的耐热氧老化性能;并用体系中,随着CPE含量的增加,并用胶的强度和硬度增加,永久变形增大,耐油性能改善,但耐热氧老化性能变差;使用氧化镁和白炭黑作填料,可提高并用胶的耐热氧老化性能;氧化镁可作CPE的有效的稳定剂。     

三元乙丙/氯磺化聚乙烯共混胶相容性研究

本文主要研究了三元乙丙橡胶(EPDM)/氯磺化聚乙烯(CSM)共混胶性能,通过添加增容剂氯化聚乙烯(CPE)和乙烯-醋酸乙烯酯(EVM)、交联助剂甲基丙烯酸锌(ZDMA)和三(甲基丙烯酸)三羟甲基丙烷酯(TMPTMA)来改善EPDM/CSM共混胶的相容性,对比分析EPDM/CSM共混胶的物性、动态力学性能和微观相态。结果表明,随着CSM用量的增加,CSM/EPDM共混胶拉伸强度明显下降,EPDM与CSM相容性不良;加入CPE、EVM、ZDMA、TMPTMA后,共混胶拉伸强度、撕裂强度都增加,硬度也都不同程度增大,加入ZDMA的共混胶拉伸强度提高最大;加入CPE、EVM、ZDMA、TMPTMA后,EPDM 与CSM共混胶的相容性稍有改善,共混胶阻尼曲线中间的“平台区”都有所下降;ZDMA改善EPDM/CSM共混胶相容性要比其它组分好。     

丁腈橡胶/乙烯-乙酸乙烯酯共聚物并用比对并用胶性能的影响

研究丁腈橡胶(NBR)/乙烯-乙酸乙烯酯共聚物(EVM)并用比对并用胶物理性能、耐老化性能、耐油性能和耐热性能的影响。结果表明:随着EVM用量的增大,NBR/EVM并用胶的100%定伸应力、拉伸强度、撕裂强度和压缩永久变形增大,脆性温度和拉断伸长率变化很小,耐老化和耐热性能改善,耐油性能小幅下降。NBR与EVM具有良好的相容性。     

HVBR/EVM共混胶制备及阻尼性能的研究

将高乙烯基聚丁二烯橡胶(HVBR)与玻璃化转变温度在20℃左右的乙烯-醋酸乙烯酯橡胶(EVM)共混以拓宽HVBR的有效阻尼温域,研究共混方式(原位共混、机械共混)和并用比(HVBR/EVM800/EVM900=100/10/10、100/15/15、100/20/20)对共混胶阻尼性能的影响。结果表明,原位共混的HVBR/EVM共混胶与传统机械共混的共混胶相比,两相分散更加均匀,分散性更好,相容性好,阻尼性能和耐磨性能得以明显改善。当HVBR/EVM800/EVM900=100/20/20时,共混胶的阻尼性能达到最佳。     

增容剂对EVM/PLA阻尼材料相容性的影响

采用过氧化二异丙苯(DCP)为交联剂,三聚异氰酸三烯丙酯(TAIC)为助交联剂,使用动态粘弹谱仪(DMA)对乙烯醋酸乙烯酯橡胶(EVM)/聚乳酸(PLA)阻尼材料的相容性进行了研究。考察了氯化聚乙烯(CPE,氯质量分数35%)、丁二烯-丙烯腈-甲基丙烯酸缩水甘油酯三元共聚物(NBR-GMA,GMA质量分数约为5%)两种增容剂对相容性和力学性能的影响。结果表明,当CPE和NBR-GMA用量分别为10份时,共混物相容性较好,CPE增容效果较优。加入CPE,能促进PLA在EVM/PLA共混物中的异相成核结晶。加入两种增容剂使材料的拉伸性能稍有降低,但撕裂性能有所提高,拉伸永久变形降低,用量为10份时,综合力学性能较好。     

无卤阻燃EVM/EPDM并用胶的性能研究

试验研究乙烯-乙酸乙烯酯橡胶（EVM）/EPDM并用胶的性能。结果表明,随着EPDM用量的增大,EVM/EPDM并用胶的物理性能变化不大,热空气老化后并用胶的邵尔A型硬度和拉伸强度增大,拉断伸长率减小,耐低温性能提高；EVM或EVM/EPDM并用胶的阻燃性能明显优于EPDM；添加阻燃剂和增塑剂的EVM/EPDM并用胶的相容性较未添加阻燃剂和增塑剂的并用胶有所改善。     

增韧改性剂对ABS/DBDPE/Sb_2O_3共混体系性能的影响

研究了苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)、氯化聚乙烯(CPE)、ABS粉料、甲基丙烯酸甲酯-丁二烯-苯乙烯共聚物(MBS)和聚硅氧烷几种改性剂对ABS/DBDPE/Sb2O3体系的增韧作用。结果表明,SBS、CPE、ABS粉料、MBS和聚硅氧烷对阻燃ABS复合材料有很好的增韧作用,可获得具有良好阻燃性能和物理机械性能的复合材料,其中加入CPE、MBS及聚硅氧烷并不影响复合材料的阻燃性能。     

不同熔融焓氯化聚乙烯对PVC改性的影响

采用不同熔融焓增韧改性剂CPE对PVC进行了改性,研究了 CPE对PVC/CPE共混料的影响.结果表明:不同熔融焓的增韧改性剂CPE对PVC/CPE共混料的流变性能、缺口冲击强度、拉伸冲击强度和焊接强度都有较大的影响;含氯质量分数为36％左右、熔融焓(DSC法)≤1.4 J/g的CPE比较适合作为PVC材料的冲击改性剂...     

原位生成甲基丙烯酸钠增强EVM硫化胶的性能

通过氢氧化钠（NaOH)和甲基丙烯酸（MAA）的中和反应，在乙烯－乙酸乙烯酯橡胶（EVM）中原位生成甲基丙烯酸钠（NaMAA)，研究了NaMAA原位增强EVM的流变特性，应力软化和应力松弛以及老化前后的力学性能，并与炭黑（N330）增强的硫化胶进行对比，结果表明：NaMAA的引入对EVM混炼胶的门尼粘度几乎没有影响，但在硫化过程中提高了混炼胶的硫化速度，缩短了焦烧时间，与HAF相比，NaMAA对EVM硫化胶具有更好的增强效果，较好的耐老化性能，NaMAA增强的EVM硫化胶具有更明显的应力软化效应，应力松弛程度更大。     

Study on the damping of EVM based blends

The mechanical and damping properties of blends of ethylene‐vinyl acetate rubber(VA content >40 wt %) (EVM)/nitrile butadiene rubber (NBR) and EVM/ethylene‐propylene‐diene copolymer (EPDM), both with 1.4 phr BIPB (bis (tert‐butyl peroxy isopropyl) benzene) as curing agent, were investigated by DMA. The effect of polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), and dicumyl peroxide (DCP) on the damping and mechanical properties of both rubber blends were studied. The results showed that in EVM/EPDM/PVC blends, EPDM was immiscible with EVM and could not expand the damping range of EVM at low temperature. PVC was miscible with EVM and dramatically improved the damping property of EVM at high temperature while keeping good mechanical performance. In EVM/NBR/PVC blends, PVC was partially miscible with EVM/NBR blends and remarkably widened the effective damping temperature range from 41.1°C for EVM/NBR to 62.4°C, while CPVC mixed EVM/NBR blends had an expanded effective damping temperature range of 63.5°C with only one damping peak. Curing agents BIPB and DCP had a similar influence on EVM/EPDM blends. DCP, however, dramatically raised the height of tan δ peak of EVM/NBR = 80/20 and expanded its effective damping temperature range to 64.9°C. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

橡胶型乙烯-醋酸乙烯酯共聚物与热塑性聚氨酯弹性体共混物耐油性能研究

将2种乙烯-醋酸乙烯酯共聚物（EVM400，EVM700）和2种热塑性聚氨酯弹性体（聚酯型TPU385E和聚醚型TPU8685）按不同并用比进行交叉共混，考察了共混体系的耐油性能。结果表明，3#标准油较1#标准油对EVM／TPU共混胶性能影响大，且VA含量低的EVM400共混胶比VA含量高的EVM700共混胶受3#标准油的影响大；EVM700／TPU385E共混胶具有最好的耐油性；EVM／TPU共混胶并用比为50／50时．浸油前后性能变化最大，即耐油性最差。     

Properties of EVM vulcanizates reinforced by in situ prepared sodium methacrylate

Ethylene–vinyl acetate copolymer (EVM) vulcanizates with good mechanical properties and high transparency were obtained using sodium methacrylate (NaMAA) as a reinforcing agent. Sodium methacrylate was in situ prepared through the neutralization of sodium hydroxide (NaOH) and methacrylic acid (MAA) in an EVM and used to reinforce the EVM cured by dicumyl peroxide (DCP). Different factors such as the DCP content, NaMAA content, and the mol ratio of NaOH/MAA were included to study their effects on the mechanical properties, optical properties, stress‐relaxation behavior, and crosslink structure of the EVM vulcanizates. The rheological behavior of the EVM compounds was also investigated and compared with that of the high abrasion furnace carbon black (HAF)/EVM compounds. The experimental results show that with an increase of the NaMAA content the curing rate index (C_R) of the EVM compounds is greatly speeded up, while the Mooney viscosities of the compounds remain nearly unchanged. The mechanical properties and optical properties of the NaMAA‐reinforced EVM vulcanizates depend on the NaMAA content and the mol ratio of NaOH/MAA. The formulation of DCP of 3 phr and a NaOH/MAA mol ratio of 1.0 is recommended for the EVM vulcanizate with high mechanical properties. At a given NaOH/MAA mol ratio of 1.0, all the EVM vulcanizates are transparent and the light transmission is over 76% in the NaMAA content range of 10–50 phr. The NaMAA/EVM vulcanizates show faster stress relaxation and more obvious stress‐softening effects than those of the HAF/EVM vulcanizates. Crosslink density analysis indicated that the EVM vulcanizates contain both covalent and ionic bonds. The ionic crosslink densities greatly increase with an increasing NaMAA content. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2192–2200, 2003     

不同共混比的CM／EVM共混胶共硫化的研究

研究了不同共混比的氯化聚乙烯（CM）／乙烯-醋酸乙烯酯（EVM）共混胶的物理机械性能、两相溶胀度及两相交联密度;并研究了共混胶中CM相和EVM相产生相间交联的特征、动态力学性能、CM硫化胶与乙酸乙酯溶剂的相互作用参数及EVM硫化胶与丁酮溶剂的相互作用参数。结果表明,当m（CM）／m（EVM）-30／70时,共混胶的拉伸强度较大;共混胶中CM相与EVM相的交联密度比较匹配;两相间有相间交联。     

DMA analysis of the damping of ethylene–vinyl acetate/acrylonitrile butadiene rubber blends

The mechanical and damping properties of blends of ethylene–vinyl acetate rubber (VA content > 40% wt) (EVM)/acrylonitrile butadiene rubber (NBR), with 1.4 phr BIPB [bis (tert‐butyl peroxy isopropyl) benzene] as curing agent, were investigated by DMA and DSC. The effect of chlorinated polyvinyl chloride (CPVC), silica, carbon black, and phenolic resin (PF) as a substitute curing agent, on the damping and mechanical properties of EVM/NBR blends were studied. The results showed that 10 phr CPVC did not contribute to the damping of EVM700/NBR blends; Silica could dramatically improve the damping of EVM700/NBR blends because of the formation of bound rubber between EVM700/NBR and silica, which appeared as a shoulder tan δ peak between 20 and 70°C proved by DMA and DSC. This shoulder tan δ peak increased as the increase of the content of EVM in EVM/NBR blends. The tensile strength, modulus at 100% and tear strength of the blend with SiO₂ increased while the elongation at break and hardness decreased comparing with the blend with CB. PF, partly replacing BIPB as the curing agent, could significantly improve the damping of EVM700/NBR to have an effective damping temperature range of over 100°C and reasonable mechanical properties. Among EVM600, EVM700, and EVM800/NBR/silica blend system, EVM800/NBR/silica blend had the best damping properties. The EVM700/NBR = 80/10 blend had a better damping property than EVM700/NBR = 70/20. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Morphology and mechanical properties of ethylene‐vinyl acetate rubber/polyamide thermoplastic elastomers

High performance thermoplastic elastomers based on ethylene‐vinyl acetate rubber (EVM) and ternary polyamide copolymer (tPA) were prepared through a dynamic vulcanization process in the presence of dicumyl peroxide (DCP). The morphology, crystallization, and mechanical properties of the EVM/tPA blends were studied. A phase transition of EVM/tPA blend was observed at a weight ratio of 60/40. The presence of EVM increased the melting enthalpy at the high temperature of tPA, ascribing to the heterogeneous nucleating effect of EVM. The tensile strength of EVM/tPA (70/30) blends was increased up to 20.5 MPa as the DCP concentration increased to 3.5 phr, whereas the elongation at break of the blends kept decreasing as the DCP concentration increased. The addition of ethylene‐acrylic acid copolymer (EAA) or maleic anhydride‐grafted EVM (EVM‐g‐MAH) to the EVM/tPA blends both induced finer dispersion of the EVM particles in the tPA phase and improvement in the tensile strength and elongation at break of the blends, which were ascribed to the compatibilization of EAA or EVM‐g‐MAH. Finally, a high performance EVM/tPA (70/30) thermoplastic elastomer with Shore A hardness of 75, tensile strength of 24 MPa, elongation at break of 361%, and set at break of 20% was obtained by adding 5 wt % of EVM‐g‐MAH and 3.5 phr DCP. It has great potential in automotive and oil pipeline applications. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

EVM改性硅橡胶耐油性和耐热性的研究

采用乙烯-醋酸乙烯酯橡胶(EVM)共混改性硅橡胶,研究了其共混比对胶料耐油性和耐热性的影响。结果表明,随着EVM用量的增加,共混胶料的力学性能得到改善。在ASTM 1#和ASTM 3#油中浸泡后,体积变化率和硬度变化呈现下降趋势,提高了硅橡胶的耐油性能。热分析表明,随着EVM用量的增加,硫化胶的分解温度下降,耐热性有所降低。DMA数据显示,加入EVM后共混胶料的低温性能下降,损耗因子变大。