影响ACM／FKM硫化胶耐热老化性能的配方因素

研究了共混比、炭黑品种及用量、软化剂和防老剂种类等配方因素对丙烯酸酯橡胶（ACM）／氟橡胶（FKM）硫化胶耐热老化性能的影响。结果表明,经180℃×48h热老化后,ACM／FKM硫化胶的力学性能保持率随ACM用量的增加而降低;加入0～50质量份炭黑补强的硫化胶耐热老化性能随炭黑用量增加而提高;使用软化剂硅油的硫化胶的耐热老化性能较好;添加防老剂可提高共混硫化胶的耐热老化性能,其中防老剂RD和A效果较好。     

ACM/FKM并用胶的性能研究

研究了不同并用比的氟橡胶（FKM）和丙烯酸酯橡胶（ACM）并用胶的硫变特性、物理机械性能、耐老化性、热稳定性和压缩永久变形性能。实验结果表明：ACM与FKM可以很好地混合并且各自交联,从而制备综合性能优异的并用胶;并用比为30/70的ACM/FKM并用胶综合性能较佳,二段硫化后其物理机械性能和压缩永久变形性能明显改善,且耐热空气老化性能优异;热重分析结果表明,并用胶有很好的热稳定性。     

FKM/ACM并用胶的结构及性能研究

对采用双酚AF/促进剂BPP硫化体系的氟橡胶(FKM)/丙烯酸酯橡胶(AcM)并用胶的各项性能进行研究.结果表明:以双酚AF/促进剂BPP为硫化体系,FKM和ACM可以实现共硫化,制得的FKM/ACM并用胶物理性能优良,耐热氧、耐紫外光和耐臭氧老化性能以及热稳定性较好,压缩永久变形性能优异}扫描电子显微镜显示FKM和ACM具有较好的相容性.     

氟橡胶与聚偏氟乙烯并用研究

研究了聚偏氟乙烯对氟橡胶力学性能、动态力学性能和形态结构的影响。随着聚偏氟乙烯含量的增加，氟橡胶／聚偏氟乙烯并用胶的拉伸强度、撕裂强度、硬度、压缩永久变形随之增加。同时拉断伸长率有所下降；动态力学分析（DMA）结果表明：随着PVDF含量的增加，FKM／PVDF并用胶的储能模量在低温区域内有所减小，但在相对高温区域内有增大的趋势，FKM的了童无明显偏移，PVDF的了1g不明显；扫描电子显微镜（SEM）结果表明：FKM／PVDF并用胶中，PVDF为分散相，FKM为连续相，分散相尺寸小于1μm，提高PVDF含量，PVDF有转变为连续相的趋势。     

共混比对ACM／FKM共混胶性能的影响

采用硫化剂TCY为共硫化剂,研究了共混比对丙烯酸酯橡胶／氟橡胶共混胶的硫化特性、力学性能、耐热老化性能和耐油性能的影响。结果表明：TCY可以同时硫化两种橡胶;ACM／FKM共混比为20／80时．硫化胶具有较好综合力学性能和耐热老化性能;随着ACM用量的增加,硫化胶耐油性能逐渐下降。     

硅橡胶/丙烯酸酯橡胶并用胶的加工与性能

研究了甲基乙烯基硅橡胶（MVQ）／丙烯酸酯橡胶（ACM）并用胶中MVQ与ACM的配比，补强剂，加工工艺及其它添加剂对并用胶性能的影响，结果表明：MVQ与ACM并用后，其耐油性得到较大提高，且随着CM用量的增大，并用胶的耐油性逐步提高；补强剂对提高并用胶耐油性有一定作用，补强剂用量越多，并用胶的耐油性越好；补强剂的加入顺序对并用胶的各项性能有一定影响；加入羟基硅油可降低并用胶的扯断永久变形。     

ACM/FKM并用胶的性能研究

研究了不同并用比的氟橡胶和丙烯酸酯橡胶并用胶的硫化特性、物理机械性能、耐老化性、热稳定性和压缩永久变形性能.结果表明: ACM与FKM可以很好地混合并各自交联,从而制备综合性能优异的并用胶;并用比为30/70时,ACM/FKM并用胶综合性能较佳,二段硫化后其物理机械性能和压缩永久变形性能均明显改善,且耐热空气老化性能优异;热重分析结果表明,并用胶具有很好的热稳定性.     

耐高温耐老化龟裂氟橡胶/三元乙丙橡胶并用胶的制备与性能研究

研究硫化体系、氟橡胶（FKM）/三元乙丙橡胶（EPDM）并用比、相容剂马来酸酐接枝三元乙丙橡胶（MA-g-EPDM）对FKM/EPDM并用胶物理性能以及耐高温和耐老化龟裂性能的影响。结果表明：随着硫化剂DCP用量的增大,FKM/EPDM并用胶的邵尔A型硬度和拉伸强度提高,拉断伸长率降低;随着FKM/EPDM并用比的增大,FKM/EPDM并用胶的拉伸强度和拉断伸长率均降低,但耐老化龟裂性能提高;FKM/EPDM并用比为30/70、硫化剂DCP用量为3份时,FKM/EPDM并用胶具有较好的综合性能;添加相容剂MA-g-EPDM不能提高FKM/EPDM并用胶的物理性能。     

FKM/EPDM耐高温抗老化龟裂橡胶材料的制备

三元乙丙橡胶（EPDM）常被用于制备耐高温橡胶制品,但是随着使用时间的延长或者环境温度的升高, EPDM橡胶制品容易老化龟裂而降低产品的使用寿命。本文研究了硫化体系、FKM/EPDM并用比、相容剂马来酸酐接枝的乙丙橡胶（MA-g-EPDM）对FKM/EPDM并用胶的力学性能、耐老化性能、抗龟裂性能的影响。结果表明：硫化剂过氧化二异丙苯（DCP）用量在为3份,FKM/EPDM并用比为30/70时并用胶的力学性能较好;随着并用胶中FKM比例的增加,并用胶的抗老化龟裂性能提高,当并用胶中FKM比例超过50份时,并用胶经280℃×4h的老化之后,表面无裂纹产生;相容剂MA-g-EPDM与FKM之间虽然可以产生氢键,但由于接枝率低、分子量低,对FKM/EPDM力学性能的提高无效果,反而会降低并用胶的力学性能。     

新型耐热性ACM与FKM复合弹性体

1前言鉴于汽车发动机输出功率增大,效率提高以及环保措施和无维修化的趋势,发动机周围部件亟待提高耐热性和延长使用寿命,日益要求改善丙烯酸酯橡胶（ACM）的耐热性。另一方面,为提高发动机油的性能日益广泛使用胶系添加剂,这使发动机周围使用的氛橡胶（FKM）受到不良影响令人担忧,例如其使用时硬度增大,伸长率下降,出现细微裂纹等。因此,在以汽车上的用途为中心的应用领域迫切需要开发能克服ACM和FKM的上述缺点,具有介于两者之间的平衡特性的材料。很久以前就已开始试图将liXM与ACM共混制得具有中间特性的硫化胶的尝试,…     

Viscoelastic properties of ternary in situ elastomer composites based on fluorocarbon, acrylic elastomers and thermotropic liquid crystalline polymer blends

Dynamic mechanical analysis was performed to characterize the viscoelastic properties of binary and ternary blends of fluorocarbon elastomer (FKM), acrylic elastomer (ACM) and liquid crystalline polymer (LCP). The results showed that the storage and loss modulus of all the blends increased significantly with the weight percentage of the LCP. The glass transition temperature evaluated at the loss modulus peak, were in the range of −10-+5 °C for all the blends. The time temperature superposition principle was applied for the FKM/ACM and 20% LCP filled FKM/ACM blend in order to evaluate the changes in the viscoelastic properties of FKM/ACM blend by the addition of LCP. The Arrhenius and William-Landel-Ferry (WLF) equations were used to quantify the viscoelastic behaviour at the glass transition region. Both the blends exhibited a single relaxation, which is glass transition, observed as a peek in the loss modulus at 1 Hz. The glassy moduli of these two systems were found to be comparable, but the rubbery moduli of the LCP filled FKM/ACM was much higher than the LCP unfilled system. However, the viscoelastic behaviour of these two systems and their sensitivity to time temperature may be considered to be quite similar.     

丙烯酸酯橡胶的研究与应用

采用丙烯酸酯类单体通过乳液聚合制备了丙烯酸酯橡胶（ＡＣＭ）。试验研究了ＡＣＭ硫化胶的性能。结果表明,ＡＣＭ引入—ＣＯＯＨ基团,用环氧树脂作硫化剂,可以实现高温快速硫化,且其硫化胶性能良好;增大带有柔性基团的单体（增塑剂）的比例,可以改善ＡＣＭ硫化胶的耐低温性;增大极性大的单体（丙烯腈）的比例,可以改善ＡＣＭ硫化胶的耐油性和耐热性。ＡＣＭ与氟橡胶（ＦＫＭ）并用初步研究结果显示,ＦＫＭ的用量在５０份以上时,并用硫化胶性能接近ＦＫＭ     

Influence of interactions on the mechanical,morphological and thermal properties of in situ ternary composites based on fluorocarbon elastomer,acrylic elastomer and liquid crystalline polymer blends

The mechanical, morphological and thermal properties of the binary and ternary blends of a fluorocarbon elastomer (FKM), an acrylic elastomer (ACM) and a liquid crystalline polymer (LCP) were investigated. The ternary blends were prepared by varying the amount of the LCP but fixing the ratio of the FKM and ACM. Addition of a third component, a polyacrylic rubber which interacted with the LCP, facilitated the structural development of the LCP phase by acting at the interface. The mechanical properties of the ternary blends were substantially improved because of both the fibril generation and adhesion of rubber particles on the LCP fibrils, which were attributed to the ACM interaction. Morphological investigations suggest that the fine fibrillation of the LCP domains is more apparent in the ternary blends than in the binary blends of FKM and LCP prepared under the same processing conditions. Thermogravimetric analysis (TGA) revealed an improved thermal stability of the FKM in the presence of the LCP for the binary blends, but a lower thermal stability for the ternary blends. Copyright © 2005 Society of Chemical Industry     

Acrylic rubber‐fluorocarbon rubber miscible blends: Effect of curatives and fillers on cure,mechanical, aging,and swelling properties

The cure characteristics and mechanical properties of gum and filled acrylic rubber (ACM), fluorocarbon rubber (FKM), and their blends of varying compositions were studied both under unaged and aged conditions. The rheometric study showed that optimum cure properties were obtained using a mixed curing system of blocked diamine, hexamethylenediamine carbamate (Diak #1), and ammonium benzoate. From varying the curing agents, the optimum levels of Diak #1 and ammonium benzoate were found to be 1.5 and 2.5 phr, respectively. The addition of different fillers and their loading influenced the cure properties, with increased torque and reduced scorch safety. The gum and filled 50:50 (w/w) ACM‐FKM showed overall performance in strength properties. Postcuring improved the strength of all the systems, especially the systems with a higher proportion of FKM. None of the properties changed significantly during aging of the blends. FKM and the blends containing a higher proportion of FKM were affected least by aging. Swelling of the blends was reduced by the addition of fillers. Dynamic mechanical thermal analysis showed a single tan δ peak corresponding to a single phase transition for both cured and filled blends. The storage modulus of the blend increased from the gum blend to the filled blend, indicating the presence of polymer‐filler interaction. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1442–1452, 2003     

氟橡胶/甲基乙烯基硅橡胶共混弹性体的性能

通过机械共混法制备了氟橡胶(FKM)/甲基乙烯基硅橡胶(MVQ)弹性体,研究了二者的质量比对共混弹性体力学性能、耐油性能和动态力学性能的影响.结果表明,当FKM/MVQ(质量比,下同)为80/20时,共混弹性体具有较好的综合力学性能.随着FKM所占比例的增加,共混弹性体的耐油性能提高.当振动频率为1 Hz时,共混弹性体中MVQ相的玻璃化转变温度(Tg)比MVQ的Tg提高了约5.0 ℃,而FKM相的Tg改变不大;当FKM/MVQ为60/40时,随着振动频率由1 Hz增大到50 Hz,FKM相的Tg升高了12.9 ℃,而MVQ相的Tg变化不大.     

炭黑对丙烯酸酯橡胶／氟橡胶共混物性能的影响

研究了炭黑品种和用量对丙烯酸酯橡胶／氟橡胶（ACM／FKM）共混物硫化特性、硫化橡胶力学性能及耐热老化性能的影响。结果表明：当丙烯酸酯橡胶和氟橡胶共混比为30／70时,加入炭黑后共混物焦烧时间t10和正硫化时间t90都减小,硫化橡胶力学性能有不同程度提高。随N660用量的增加．硫化橡胶力学性能先上升后下降。当炭黑用量为20份时,效果最好。