ECO/NBR共混胶的性能

考察二元共聚氯醚橡胶(ECO)与不同丙烯腈质量分数的NBR共混胶的物理性能、耐老化性能及耐油性能。结果表明，共混胶的物理性能提高，ECO／NBR-4l共混胶的耐热老化性能优于ECO／NBR-35和ECO／NBR-26共混胶．NBR-4l的耐油性能最好。共混比为60／40的ECO／NBR-4l共混物具有优异的耐油性能，玻璃化温度范围为-46～-43℃，可满足耐寒制品的使用要求。     

动态硫化丁腈橡胶/二元共聚氯醚共混胶的制备与性能

采用动态硫化法制备了丁腈橡胶(NBR)／二元共聚氯醚(ECO)共混胶,研究了动态硫化温度、时间及不同丙烯腈含量的NBR对动态硫化胶性能的影响,对比了动态硫化胶和常规共混胶在性能上的差异。结果表明,当动态硫化温度为150℃．动态硫化时间为NBR的正硫化时间时,NBR／ECO共混胶中内聚能密度大的ECO为连续相。与常规共混胶相比,动态硫化胶具有低压缩永久变形及良好的力学性能、耐老化性能和耐油性能。     

氯醚橡胶/NBR并用胶的性能研究

研究了不同并用比的氯醚橡胶（ECO）与NBR-26,NBR-33和NBR-41并用胶的力学性能、耐老化性能和耐油性能。结果表明,NBR-26,NBR-33和NBR-41的用量在10～40份的范围内,对胶料的拉伸强度和扯断伸长率的影响不大;随着NBR-26的用量增大,硫化胶在油中的体积变化率增大,而且在100℃油中的体积变化率尤为明显,随着NBR-23的用量增大,硫化胶在100℃油中的体积变化率呈上升的趋势;随着NBR-41的用量增大,硫化胶在100℃油中的体积变化率明显下降。     

共混比对丁腈橡胶/氯醚橡胶性能的影响

研究了共混比时常规共混及动态硫化共混丁腈橡胶(NBR)／氯醚橡胶(ECO)的力学性能及加工流变性能的影响。结果表明,共混比对NBR／ECO胶料的力学性能及加工流变性能影响显著。NBR经动态硫化后,压缩永久变形及挤出胀大明显减小,拉伸强度提高,表现黏度随ECO用量的增大而减小。共混比对常规共混胶的表观黏度影响不大。动态硫化有利于改善NBR／ECO胶料的加工性能。     

氯醚橡胶/丁腈橡胶共混物的结构与性能

研究了不同并用比的氯醚橡胶（ECO）／丁腈橡胶（NBR）共混物的相态结构,力学性能,耐老化性能和耐油性能,透射电镜照片显示：ECO／NBR为70／30（质量份,下同）时共混物呈双连续相：为60／40和40／60时ECO都为分散相,且两相界面清晰。加入NBR降低了ECO的拉伸强度和看断伸长率,以及耐热空气老化性能,随着NBR用量的提高,共混物硫化胶在油中的体积变化率增加,ECO／NBR为70／30时硫化胶在100℃热油中的性能保持率最高,而且体积变化率与ECO的相当。     

TCY/TMTD硫化体系对CO/ECO共混物性能的影响

研究了三聚硫氰酸（TCY）/二硫化四甲基秋兰姆（TMTD）复合硫化体系对CO/ECO共混物的力学性能、耐热老化性能和高温压缩永久变形性能的影响。结果表明：适当的TCY用量可以获得较好力学性能的CO/ECO共混胶。增加TCY用量可以显著提高共混胶的耐热老化性能和高温压缩永久变形性能;而增加TMTD用量会导致CO/ECO共混胶耐热老化性能和高温压缩永久变形性能下降;二段硫化可以降低共混胶的压缩永久变形。     

TCY/TRA复合硫化体系对ACM/ECO共混胶性能的影响

分别采用TCY/TRA和TCY/NA-22两种硫化体系硫化 ACM/ECO共混胶.研究了不同硫化体系、TCY用量和TRA用量对ACM/ECO共混胶的硫化特性,力学性能、耐热老化性能、耐油性能和高温压缩xxx永久变形性能的影响.结果表明,TCY/TRA硫化体系能使ACM/ECO共混胶实现共硫化;其用量为1.5份/1.5份...     

ECO/NBR共混橡胶的共硫化性能

研究了二元共聚氯醚橡胶（ECO）与丙烯腈质量分数为41%的丁腈橡胶（NBR）的共硫化性以及共硫化剂用量对ECO/NBR物理机械性能，耐老化性能，耐油性能的影响。结果表明，促进剂TT可以作为ECO/NBR的共硫化剂。当ECO采用NA-22/TT/Pb3O4/MgO并用硫化体系，NBR采用DCP/TAIC/TT/MgO，且促进剂TT用量为1.5份时，ECO/NBR共混胶的物理机械性能，耐老化性能及耐油性能达到最佳平衡。     

二段硫化的均聚型/共聚型氯醚共混胶的性能

研究了二段硫化对均聚型(CO)／共聚型(ECO)氯醚共混胶的力学性能以及高温压缩永久变形的影响：结果表明，采用NA-22硫化体系硫化的CO／ECO共混胶，在合适的二段硫化条件下，可增加硫化胶的拉伸强度，但降低了其扯断伸长认；而采用TCY硫化的共混胶．二段硫化后，硫化胶的拉伸强度基本不变，扯断伸长率减小，二段硫化能明显减少CO／ECO共混胶的高温压缩永久变形，而且在一定范围内．二段硫化时间的延长有利于减少硫化胶的高温压缩永久变形。     

NBR-26/木质素树脂硫化胶的结构与性能

考察了用木质素树脂作填充剂制备的NBR-26/木质素树脂硫化胶的硫化特性、力学性能及结构形态。结果表明,随着木质素树脂用量(50～150质量份)的增加,达到正硫化时对硫化略有延迟作用,但硫化胶仍具有优异的耐热、耐热油老化性能及良好的力学性能。适当控制NBR-26与木质素树脂的共混比可降低基础胶的T_g值,有助于解决NBR-26制品的耐低温性。通过扫描电镜、差示扫描量热及动态粘弹谱表征,NBR-26与木质素树脂之间可达分子级混合,且两组分间存在协同效应。     

超细全硫化粉末丁腈橡胶/二元共聚氯醚橡胶共混物的结构与性能

采用熔融共混工艺制备了超细全硫化粉末丁腈橡胶(UFPNBR)/二元共聚氯醚橡胶(ECO)共混物,研究了共混物的相态结构、动态力学性能、物理机械性能及老化性能,并与丁腈橡胶(NBR)/ECO共混物进行了对比.透射电镜观察表明,在UFPNBR/ECO体系中,UFPNBR为分散相,ECO为连续相;而在NBR/ECO体系中,ECO为分散相,NBR为连续相.动态力学性能分析结果显示在共混质量比不超过50/50时,UFPNBR/ECO共混物只存在1个玻璃化转变温度;当共混质量比超过50/50时分散相尺寸较大,出现2个玻璃化转变温度,而NBR/ECO始终存在2个玻璃化转变温度.加入适量的UFPNBR(不超过50份,质量)能降低UFPNBR/ECO共混物的压缩永久变形.与NBR/ECO共混物相比,UFPNBR/ECO共混物的脆性温度较低,耐老化性能更好,但物理机械性能稍差.     

Mechanical properties of PVC/SBR blends compatibilized by acrylonitrile-butadiene rubber and covulcanization

The mechanical properties of poly(vinyl chloride) (PVC)/styrene-butadiene rubber (SBR) blends compatibilized by acrylonitrile-butadiene rubber (NBR) were studied. A sulfur curing system was employed to crosslink the rubber of the blends. In the case of the blends without any curing agents, an increase in NBR content did not improve the tensile strength and elongation-at-break. However, a significant improvement in the mechanical properties was observed when NBR was added as a compatibilizer and the blend was vulcanized. In the PVC/NBR/SBR (50/10/40) blends, the tensile strength and elongation-at-break increased with an increase in sulfur concentration. This improvement was attributed to covulcanization between NBR and SBR. The fracture toughness of PVC/NBR/SBR (50/10/40) blends was characterized by the critical strain energy release rate, G_c. In the case of the PVC/NBR-29/SBR (50/10/40) blends, an increase in sulfur concentration resulted in a dramatic increase in G_c. However, the G_c value of PVC/NBR-40/SBR (50/10/40) blends decreased with an increase in sulfur concentration owing to the brittle behavior of one of the blend components—the PVC/NBR-40 (50/10) phase.     

Effect of anhydride‐modified ethylene–propylene–diene rubber and ethylene–vinyl acetate copolymers on the compatibilization of nitrile rubber/ethylene–propylene–diene rubber blends

The effects of maleic anhydride modified ethylene–propylene–diene rubber (EPDMMA) and maleic anhydride modified ethylene–vinyl acetate (EVAMA) on the compatibilization of nitrile rubber (NBR)/ethylene–propylene–diene rubber (70:30 w/w) blends vulcanized with a sulfur system were investigated. The presence of EPDMMA and EVAMA resulted in improvements of the tensile properties, whereas no substantial change was detected in the degree of crosslinking. The blend systems were also analyzed with scanning electron microscopy and dynamic mechanical thermal analysis. The presence of EVAMA resulted in a blend with a more homogeneous morphology. The compatibilizing effect of this functional copolymer was also detected with dynamic mechanical analysis. A shift of the glass‐transition temperature of the NBR phase toward lower values was observed. The presence of EPDMMA and EVAMA also increased the thermal stability, as indicated by an improvement in the retention of the mechanical properties after aging in an air‐circulating oven. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2408–2414, 2003     

顺丁橡胶/天然胶并用胶在中长途轮胎胎面中的应用

研究天然橡胶（NR）/顺丁橡胶（BR）并用胶的硫化特性、物理性能及动态力学性能,确定适用于中长途载重轮胎胎面胶的NR/BR最佳并用比。结果表明：并用20phrBR为一个临界值,超过20phrBR时,硫化胶的抗裂口增长性能急剧下降;当NR/BR并用比为80/20时,并用胶的综合物理性能较好,损耗因子tanδ低,压缩永久变形小,耐磨性好,更适合应用于载重轮胎胎面。     

配方因素对均聚型/共聚型氯醚橡胶共混物耐热老化性能的影响

采用机械共混方法制备了均聚型/共聚型氯醚橡胶(CO/ECO)共混物,考察了配方因素对共混物耐热老化性能的影响。结果表明,CO和ECO二者的共混比对共混物耐热老化性能影响不大。增强剂的种类对耐热老化性能影响较为显著,以填充沉淀法白炭黑和气相法白炭黑共混物的耐热老化性能较好;以炭黑为增强剂时,其用量以40~50份为佳。以三聚硫氰酸为硫化体系硫化的共混物,其热稳定性优于以1,2-亚乙基硫脲为硫化体系硫化的共混物。添加各种软化剂,均会导致共混物耐热老化性能下降;而各种防老剂中,以防老剂NBC、4010 NA和RD对共混物的防老化效果为最好。     

The morphology and property of ultra‐fine full‐vulcanized acrylonitrile butadiene rubber particles/EPDM blends

A novel UFNBRP/EPDM blend was prepared by compounding ultra‐fine full‐vulcanized acrylonitrile butadiene rubber particles (UFNBRP) with ethylene–propylene–diene monomer (EPDM) matrix. The morphology, dynamic property, and curing property of the blend were discussed in detail. TEM and SEM observations showed that, no matter how high the blend ratio of UFNBRP to EPDM matrix was, UFNBRP particles always kept being in the dispersion phase because of its extremely high viscosity resulting from self‐crosslinking, but were not dispersed as nanosize units, as expected. Dynamic properties, illustrated by DMTA, further demonstrated that two phases exhibited two separate glass transition temperatures, indicating distinct phase separation and weak phase interaction. Rubber processing analyzer results showed that inorganic filler as well as UFNBRP particles in EPDM matrix formed a network and blocked the flow properties of the compound. At the same time, the introduction of UFNBRP particles evidently affected the vulcanization of EPDM, when sulfur was used as a vulcanizing agent, and improved the mechanical properties of EPDM. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3673–3679, 2006     

共混橡胶的共硫化研究

探讨了多种共混橡胶的共硫化体系及其对共混橡胶性能的影响。其中采用共硫化剂硫化CO/ECO、CSM/NBR、IIR/EPDM、IIR/CIIR共混胶,采用复合硫化剂硫化PUR/CR、ACM/ECO、ACM/NBR、CR/CIIR、CR/SBR共混胶,研究了硫化体系品种和用量对几种共混胶的硫化特性和力学性能的影响,为共混橡胶的硫化提供研究方案和理论指导。