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。     

TCY硫化体系对均聚氯醚橡胶性能的影响

研究了硫化剂TCY和促进剂TT、D用量对均聚型氯醚橡胶(CO)性能的影响。结果表明,随着硫化剂TCY用量的增大,CO胶料的t10,t90减小,拉伸强度、硬度和定伸应力增加,压缩永久变形、拉断伸长率和撕裂强度减小;在TCY/TT体系中,TCY用量为0.8～1.2份、TT用量为1.0份时,在TCY/D体系中,TCY用量为0.8～1.0份、D用量为0.5份时,CO的物理机械性能较好。     

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。     

硫化剂TCY对CO/ECO共混物性能的影响

研究了硫化剂TCY对均聚型氯醚橡胶(CO)供聚型氯醚橡胶(ECO)共混物性能的影响。随着硫化剂TCY用量的增大，CO/ECO共混物的t10,t90、最大转矩以及邵尔A型硬度增大，扯断伸长率和撕裂强度减小；硫化剂TCY用量为0．8份时，CO/ECO共混物的综合物理性能较好；适当增大硫化剂TCY用量，可提高CO/ECO共混物的耐热老化性能和压缩水久变形性能。     

不饱和聚醚型聚氨酯橡胶／氯丁橡胶共混物耐热老化性能的影响因素

研究了不饱和聚醚型聚氨酯橡胶(PUR)和氯丁橡胶(CR)的共混比、硫黄用量、炭黑种类及用量、软化刺种类及用量以及防老剂诸因素对PUR/CR共混物耐热老化性能的影响.结果表明,当PUR与CR的质量比20/80、硫黄用量1.0~1.5份、炭黑选用N220且其用量40份、软化荆选用古马隆树脂且用量5份以及选用防老荆RD时,可以得到耐热老化性能较好的PUR/CR共混物.     

促进剂TMTD对CO/ECO并用胶性能的影响

研究促进剂TMTD用量对均聚型氯醚橡胶 (CO) /共聚型氯醚橡胶 (ECO )并用胶硫化特性、物理性能、耐热老化性能和高温压缩永久变形的影响。结果表明 ,在CO/ECO并用胶中加入促进剂TMTD ,胶料的t1 0 延长 ,t90 缩短 ,硫化胶的耐热老化性能下降 ;硫化胶的物理性能在促进剂TMTD用量为 1份时较好 ;在合适的二次硫化条件 (160℃× 2h)下 ,添加适量的促进剂TMTD ,可以减小并用胶的高温压缩永久变形。     

配方因素对氯醚橡胶老化性能的影响研究

研究了吸酸剂氧化镁用量、填料配比和防老剂配比对共聚型氯醚橡胶(ECO)力学性能和老化性能的影响。结果表明,氧化镁用量为10 phr、白炭黑用量为30 phr、炭黑用量为10 phr、防老剂N,N-二丁基二硫代氨基甲酸镍(NBC)用量为2 phr时,胶料综合性能最好。拉伸强度为13.9 MPa,断裂伸长率为644%,100%定伸应力为2.6 MPa,硬度为71。125℃老化1 000 h后,拉伸强度保持率为100%,断裂伸长率保持率为26.4%。     

氯醚橡胶／氟橡胶共混物性能的研究

初步研究了具有不同共混比的氟橡胶（FKM）／氯醚橡胶（CO）共混物的硫化特性、物理机械性能、耐老化性能和压缩永久变形性能。结果表明：CO用量少于20份时,共混胶拉伸强度、100％定仲应力及压缩永久变形性能与纯FKM相当;当CO用量为20-40份时．共混胶拉伸强度和压缩永久变形性能均急剧下降;当用量高于40份时,趋于缓慢。FKM／CO共混胶耐老化性能保持率达到85％。     

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。     

影响氯磺化聚乙烯/丁腈橡胶共混物耐热老化性能的因素

研究了氯磺化聚乙烯(CSM)和丁腈橡胶(NBR)的共混比、硫黄用量、炭黑、防老剂及软化剂诸因素对CSM/NBR共混物耐热老化性能的影响。结果表明,将CSM与NBR共混,可以改善NBR的耐热老化性能,当CSM/NBR共混比(质量比)为50/50时,耐热老化性能得到显著提高。适当减少硫黄用量,有利于保持较高的耐热老化性能,硫黄用量以0.25~0.75份为宜。炭黑用量对共混物的耐热老化性能有影响,随着炭黑N 550用量的增加,老化后的力学性能保持率先增加后减小。防老剂NBC的耐热老化效果较好。软化剂选用邻苯二甲酸二丁酯或邻苯二甲酸二辛酯时,CSM/NBR共混物具有较好的耐热老化性能。     

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。     

不同硫化体系对氟橡胶/氯醚橡胶共混物性能的影响

在固定氟橡胶(FKM)硫化体系(双酚AF)的条件下,研究了改变氯醚橡胶(CO)硫化体系对FKM/CO共混物硫化特性以及硫化胶的物理机械性能、耐老化性能、耐油性能及热稳定性的影响。结果表明,采用促进剂NA-22/MgO体系时,FKM/CO共混物具有较好的硫化特性,硫化胶的综合物理机械性能较好,但耐老化性能仍需改善;采用促进剂TCY/MgO/CaCO3体系时需要较长的硫化时间,且焦烧性能较差;并用促进剂TMTD或促进剂DTDM后混炼胶的交联效果变差;FKM/CO共混物具有较好的热稳定性且热失重起始温度高于300℃。     

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.     

酸受体对氯醚橡胶性能的影响

考察了几种酸受体(ZnO,MgO,CaO,PbO,Pb3O4)与1,2-亚乙基硫脲(NA-22)组成的硫化体系对氯醚橡胶性能的影响。结果表明,加入酸受体后,硫化胶的邵尔A型硬度、拉伸强度、100％定伸应力和压缩永久变形提高,其中以添加PbO,Pb3O4的效果最为显著。含ZnO硫化胶的耐热氧稳定性较差,而含CaO,PbO,Pb3O4硫化胶的耐热氧稳定性良好,且添加PbO,Pb3O4的效果最佳。除ZnO外,其他酸受体均使硫化胶的起始热分解温度和微分热重分析(DTG)峰值对应的温度提高,350℃时的热失重率减小,而含ZnO硫化胶的起始热分解温度虽提高,但DTG峰值温度降低,350℃时的热失重率增大。     

Durability studies of aluminium/ aluminium joints bonded by chlorobutyl rubber-carboxylated nitrile rubber and epichlorohydrin rubber-carboxylated nitrile rubber blends

Two novel rubber blends based on chlorobutyl rubber ( )-carboxylate nitrile rubber ( ) and epichlorohydrin rubber (ECO)-carboxylated nitrile rubber ( ) can be used as adhesives for aluminium/aluminium bonding. Incorporation of silica filler in the blend and carbon black in the blend improves joint strength. The adhesives show remarkable water and salt water resistance. The adhesives based on show remarkable heat and water resistance. Heat stability of the adhesives based on is not satisfactory but can be improved by the application of silane primer on the aluminium surface. Silane primer also improves the paraffin oil resistance. The increase in joint strength resulting from the application of silane primer is due to the formation of Si-O-Al linkages at the aluminium/primer interface.     

Mechanical properties,oil resistance,and thermal aging properties in chlorinated polyethylene/natural rubber blends

The use of natural rubber (NR) for partly substituting elastomeric chlorinated polyethylene (CPE) was determined. Mechanical and thermal aging properties as well as oil resistance of the blends were also investigated. The amount of NR in blends significantly affected the properties of the blends. The blends with NR content up to 50 wt % possessed similar tensile strength to that of pure CPE even after oil immersion or thermal aging. Modulus and hardness of the blends appeared to decrease progressively with increasing NR content. These properties also decreased in blends after thermal aging. After oil immersion, hardness decreased significantly for the blends with high NR content, whereas no change in modulus was observed. The dynamic mechanical properties were determined by dynamic mechanical thermal analysis. NR and CPE showed damping peaks at about ?40 and 4 °c, respectively; these values correlate with the glass‐transition temperatures (T_g) of NR and CPE, respectively. The shift in the T_g values was observed after blending, suggesting an interfacial interaction between the two phases probably caused by the co‐vulcanization in CPE/NR blends. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 22–28, 2002; DOI 10.1002/app.10171     

Influence of silica loading on the mechanical properties and resistance to oil and thermal aging of CR/NR blends

Blends of 75/25 chloroprene rubber(CR)/natural rubber (NR) filled with various loadings of precipitated silica were prepared and their processability and mechanical properties as well as their resistance to thermal aging and oil were determined. The blend morphology was also studied using the atomic force microscopy technique. The results reveal that the mixing energy and the Mooney viscosity of the compound are increased continuously with increasing silica loading. It is also found that both scorch and optimum curing times are shortened while the total crosslink density is increased with increasing silica loading. The positive effect on cure could be explained by the chemical reaction between the allylic chlorine atom of CR and the silanol group on silica surface. The tensile strength, modulus, and hardness of the blend vulcanizate are noticeably improved while the compression set at elevated temperature is impaired with increasing silica loading. The results also reveal that both thermal aging resistance and oil resistance of the blend vulcanizates, as represented by the relative properties, are enhanced with the addition of silica. The resistance enhancement is believed to arise from the combination of the dilution effect, the increased crosslink density and also the reduction of NR dispersed phase size. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

氟橡胶/三元乙丙橡胶并用胶的性能

研究了不同并用比(质量比)时氟橡胶(FKM)/三元乙丙橡胶(EPDM)并用胶动态硫化和静态硫化后的低温性能、物理机械性能、耐老化性能和热稳定性,并用扫描电子显微镜表征了并用胶.结果表明,当并用比为30/70时,并用胶有较好的相容性;EPDM可以改善FKM的低温性能;随着EPDM用量的增加,并用胶的拉伸强度及邵尔A硬度降低;动态硫化FKM/EPDM并用胶比静态硫化FKM/EPDM并用胶具有更好的耐老化性能,但老化前前者的拉伸强度稍低于后者;FKM/EPDM并用胶的热稳定性优于纯EPDM;静态硫化FKM/EPDM并用胶中片层现象严重,动态硫化FKM/EPDM并用胶的EPDM包覆在FKM中,但相畴偏大.