有机蒙脱土对天然橡胶/丁苯橡胶的补强及增容作用

采用机械混炼法制备了天然橡胶(NR)/丁苯橡胶(SBR)/有机蒙脱土(OMMT)纳米复合材料,采用TEM和XRD对复合材料的亚微观结构进行了表征,并对复合材料的表观交联密度、静态力学性能、动态力学性能和硫化热效应进行了研究。结果表明,复合材料为剥离型纳米复合材料;OMMT能够明显提高纳米复合材料的交联密度和静态力学性能;OMMT导致NR/SBR共混胶动态损耗因子降低,并且能够促使NR和SBR玻璃化转变温度更为接近,起到了增容作用;OMMT实现了NR和SBR两相的同步硫化。     

聚丙烯／有机改性蒙脱土复合材料的流变特性及动态力学性能

用ARES流变仪研究了聚丙烯／有机改性蒙脱土复合材料的流变特性与扭转模式下的动态力学性能，并用X射线衍射研究了动态力学测试过程中复合材料的结构变化。结果表明：复合材料的储能模量G’、损耗模量G”及剪切粘度η随着蒙脱土含量的增加而增大，并且改性聚丙烯增加了基体与蒙脱土片层之间的作用力，使G’、G”、η进一步提高。另外，动态力学测试结果表明：复合材料在65℃左右，损耗角tan δ出现峰值，并且随着蒙脱土含量的增加，峰值右移，X射线衍射结果表明，这是由于加热过程中在张力作用下晶型转变引起的。     

聚酰亚胺/有机蒙脱土/丁苯橡胶复合材料性能的研究

将聚酰亚胺(PI)与有机蒙脱土(OMMT)混合,制备了PI/OMMT粉状材料;将粉状材料与丁苯胶乳(SBR)混合,制备了颗粒状PI/OMMT/SBR复合材料.SEM照片显示,有机蒙脱土可改善聚酰亚胺与丁苯橡胶的相容性.X射线衍射(XRD)结果表明,聚酰亚胺分子链与丁苯橡胶分子链一起插入有机蒙脱土层间,使层间距变大;有机蒙脱土作为交联点存在.动态力学性能测试结果表明,在频率扫描下,加入PI/OMMT后丁苯橡胶的G′最高,但tanδ较低.     

乳液插层法制备丁苯橡胶/有机蒙脱土纳米复合材料

对蒙脱土(MMT)进行了有机化改性,采用乳液插层法制备了丁苯橡胶(SBR)/有机蒙脱土(OMMT)纳米复合材料,用透射电子显微镜、X射线衍射法对OMMT及复合材料进行了表征,研究了复合材料的物理机械性能及动态力学性能.结果表明,MMT的层间距为1.47 nm,OMMT的层间距增大到2.94 nm;OMMT片层均匀分散在SBR基体中,具有良好的界面相容性;随着OMMT用量的增加,SBR/OMMT纳米复合材料的物理机械性能明显改善,且具有低填充量高增强效果的特点;SBR/OMMT纳米复合材料具有与SBR/炭黑N 330复合材料相当的抗湿滑性能,同时具有更小的滚动阻力.     

环氧树脂/有机蒙脱土复合材料的制备与力学性能研究

利用插层聚合法制备了环氧树脂/有机蒙脱土(EP/OMMT)复合材料.采用XRD对复合材料进行了表征,并研究了复合材料力学性能.实验表明:环氧树脂/有机蒙脱土形成了剥离型的纳米复合材料结构;环氧树脂中加入适量的有机蒙脱土,可以提高环氧树脂的拉伸强度和冲击强度.当经过改性的OMMT质量分数为5%时,EP/钛酸酯偶联剂(Coupler)-OMMT复合材料的拉伸强度达到51.21 MPa,提高了40.26%;当OMMT质量分数为3%时,EP/Coupler-OMMT复合材料冲击强度达25.31 kJ/m2,提高了34.56%.     

复合插层有机蒙脱土的制备及表征

以钠基蒙脱土、十六烷基三甲基溴化铵(CTAB)和己内酰胺为原料,制备了复合插层有机蒙脱土。红外光谱分析(IR)、热重分析(TGA)和X-射线衍射分析(XRD)表明,有机插层剂已进入蒙脱土的层间,CTAB/己内酰胺复合插层有机蒙脱土的层间距大于单阳离子CTAB插层有机蒙脱土的层间距。Molau实验结果表明,这种有机蒙脱土在有机介质中表现出很好的分散性。     

改性蒙脱土对EPDM/蒙脱土纳米复合材料性能的影响

研究了3种表面改性剂三甲基十八烷基氯化铵、2-羟乙基甲基十二烷基氯化铵和二甲基苄基十八烷基氯化铵处理的蒙脱土对EPDM/蒙脱土纳米复合材料物理机械性能和动态力学性能的影响.结果表明,以含有羟乙基的表面活性剂处理的蒙脱土增强EPDM的纳米复合材料具有最佳的物理机械性能和动态力学性能.     

有机蒙脱土用量对溴化丁基橡胶/炭黑复合材料结构与性能的影响

采用共混插层工艺制备了溴化丁基橡胶(BIIR)/炭黑(CB)/有机蒙脱土(OMMT)复合材料,并考察了OMMT用量对复合材料的微观结构、力学性能、动态力学性能、气密性及热氧老化性能的影响。结果表明,随着OMMT用量的增加,BIIR/CB/OMMT复合材料的气密性显著提高,当OMMT用量为5份(质量)时透气系数下降了28.9%。OMMT能明显改善复合材料的热氧老化性能,抗张积保持率达到0.90左右,最大可提高15.9%。OMMT的加入使得复合材料在0~60℃的损耗因子下降,降低了其动态生热。     

木质素/蒙脱土复合物在丁苯橡胶中的应用研究

通过絮凝沉降法制备了木质素/蒙脱土复合物(CLM),将其跟丁苯橡胶(SBR)机械共混制备了SBR/CLM复合材料,并对其微观结构、硫化特性、交联密度、力学性能、热氧老化性能以及热稳定性进行研究。结果表明:木质素与蒙脱土的相互作用提高了CLM与SBR相容性;随着CLM用量的增加,焦烧时间与正硫化时间逐渐增加,复合材料的力学性能逐渐增大,老化性能及热稳定性也得到改善。     

有机蒙脱土／硅橡胶膜的制备及吸水性能研究

采用不同碳链长度的季铵盐作为插层剂改性钠蒙脱土,以硅橡胶为基体,用溶液插层法制备有机蒙脱土／硅橡胶纳米复合材料。系统分析了有机蒙脱土对硅橡胶吸水性能的影响,包括胶膜吸水性和吸水后的力学性能。通过X射线、红外表征了有机蒙脱土的结构。实验结果袁明,烷基碳原予数越多,所制备的有机蒙脱土／硅橡胶纳米复合材料对水的阻隔性越好;当蒙脱土质量分数为3％时,吸水性最低,吸水后力学性能下降幅度最小。     

Effect of Silane Coupling Agent on the Mechanical Properties of Clay Filled Styrene Butadiene Rubber

Abstract

The effect of treatment of coupling agent [Bis (3-triethoxy-silyl-propyl) tetrasulphide] on mechanical properties of composites made from styrene butadiene rubber and clay is reported in this paper. The coupling agent in the form of solution (1.0%) was used for treatment of the filler. The treatment resulted in enhancement of mechanical properties of composites when compared with composites containing untreated clay. The properties under consideration were tensile strength, modulus at 100% and 400%, Young's modulus, hardness, etc. Good reinforcement was observed due to treatment of 1% coupling agent. Tensile strength was improved by 11%, modulus at 400% was found to improve by 237%, elongation at break was improved by 250%, while Young's modulus also was improved by 298% for treated clay composites, respectively, at 0.41 volume fraction when compared with untreated clay composites.     

石墨烯/丁苯橡胶复合材料性能研究

以湿法制备的石墨烯/丁苯橡胶(SBR)母粒作为添加助剂,研究不同用量石墨烯/SBR母粒对SBR性能的影响。结果表明:添加少量湿法石墨烯/SBR母粒可以改善SBR胶料的加工性能;石墨烯的用量和分散性对胶料性能有明显影响,当石墨烯用量较小(0. 125份)时,石墨烯在胶料中的分散性较好,胶料的耐磨性能好,生热和滚动阻力低;石墨烯用量越大,胶料的抗切割性能越好。     

Homogeneous Styrene Butadiene/Acrylonitrile Butadiene Rubber Blends

The graft copolymerization of acrylonitrile (AN) onto butadiene rubber (BR) was carried out in toluene at 80°C, using dibenzoyl-peroxide (BPO) as initiator. The synthesized poly acrylonitrile-grafted-butadiene rubber (AN-g-BR) was characterized by N% elemental analysis and Fourier-transform infrared (FT-IR) spectroscopy. Styrene butadiene rubber/acrylonitrile butadiene rubber (SBR/NBR) blends were prepared with different blend ratios in presence and absence of AN-g-BR, where the homogeneity of such blends were examined with intrinsic viscosity (η) measurements, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The scanning electron micrographs illustrate disappearance of the macro-scale phase separation of SBR/NBR rubber blend as a result of the incorporation of AN-g-BR into that blend. Viscosity measurements confirm homogeneity of that blend. Differential Scanning Calorimetry traces exhibit shifts in glass transition temperatures (T _g's) of SBR and NBR in their blend, indicating some degree of homogeneity. Physico-mechanical properties of the rubber blend vulcanizates with different blend ratios, in presence and absence of AN-g-BR, were investigated before and after accelerated thermal aging. The SBR/NBR (25/75) homogeneous blend possessed the best physico-mechanical properties after thermal aging, together with the best swelling behavior in motor oil. The physico-mechanical properties of SBR/NBR (25/75) filled blend with different types of inorganic fillers during thermal aging were studied.     

不同牌号丁苯橡胶的耐低温性能研究

研究3种牌号丁苯橡胶(SKMS-10,SL-4525-0,SBR1502)的硫化特性、物理性能和耐低温性能。结果表明:SKMS-10具有优异的耐低温性能,生胶的玻璃化转变温度(T_g)为-73.3℃,硫化胶的T_g为-59.8℃,适于在极寒条件下使用;SL-4525-0胶料的F_max-FL较大,硫化胶的拉伸强度为19.3 MPa,撕裂强度为53 kN·m^-1,T_g为-48.6℃,具有优异的综合性能;SBR1502硫化胶的拉伸强度高达24.9 MPa,撕裂强度为49 kN·m^-1,但T_g为-38.4℃,耐低温性能较差,适用于载荷较大且耐低温性能要求不高的橡胶减振制品。     

丁腈橡胶对白炭黑炭黑补强溶聚丁苯橡胶性能的影响

研究丁腈橡胶（NBR）用量对白炭黑-炭黑补强溶聚丁苯橡胶（SSBR）性能的影响。结果表明：随着NBR用量的增大,白炭黑-炭黑补强SSBR混炼胶的t10和t90缩短,硫化速度提高;硫化胶的拉伸强度略有下降,压缩生热和压缩永久变形增大;NBR用量为4份时可以同时优化胶料的抗湿滑性能、滚动阻力和耐磨性能。     

Curing Characteristics and Mechanical and Morphological Properties of Styrene Butadiene Rubber/Virgin Acrylonitrile-Butadiene Rubber (SBR/vNBR) and Styrene Butadiene Rubber/Recycled Acrylonitrile-Butadiene Rubber (SBR/rNBR) Blends

Curing characteristics and mechanical and morphological properties of styrene butadiene rubber/virgin acrylonitrile-butadiene rubber (SBR/vNBR) and styrene butadiene rubber/recycled acrylonitrile-butadiene rubber (SBR/rNBR) were investigated. Results indicated that the curing characteristics, such as scorch time, t₂, and cure time, t₉₀, of SBR/vNBR and SBR/rNBR blends decreased with increasing vNBR and rNBR content. At similar blend ratios, particularly up to 15 phr, SBR/rNBR blends exhibited higher t₂ and t₉₀ compared with SBR/vNBR blends. Minimum torque (ML) and maximum torque (MH) of SBR/vNBR blends significantly increased with increasing vNBR content. For SBR/rNBR blends, ML increased with increasing rNBR content, but MH exhibited the opposite trend. Tensile strength, elongation at break (E_b), resilience, and fatigue decreased with increasing virgin and recycled NBR content in both blends. Up to 15 phr, the tensile strength, E_b and fatigue life (Kc) of SBR/rNBR blends were higher than in SBR/vNBR blends. The M100 (stress at 100% elongation), hardness, and cross-linking density of both blends also showed an increasing trend with increasing vNBR and rNBR content. The scanning electron microscopy study indicates that rNBR exhibited a weak rNBR-SBR matrix interaction particularly when more than 15 phr of rNBR was used, thus decreasing the mechanical properties of SBR/rNBR blends.     

OMMT对PET薄膜力学性能的影响

本文用双十八烷基氯化铵、双十八烷基溴化铵、咪唑、聚醚胺、咪唑啉和羧基季鏻盐等6种改性剂制备了有机蒙脱土(OMMT),并用其对聚对苯二甲酸乙二醇酯(PET)进行复合改性,探究了OMMT影响PET拉伸性能的主要因素.采用TG-DTG、SEM、DSC和XRD等方式,对OMMT和改性PET薄膜进行性能表征,实验结果表明,OMM...     

Effect of Silica on Uncompatibilized and Compatibilized Styrene Butadiene Rubber and Nitrile Rubber Blends

The present paper investigates the interaction of silica filler in uncompatibilized and compatibilized styrene butadiene rubber/nitrile rubber (SBR/NBR) blends of varying compositions. The use of a dynamic mechanical analyzer as a tool for confirming the compatibility by the addition of dichlorocarbene modified styrene butadiene rubber (DCSBR) in these blends has been described. The addition of silica in uncompatibilized as well as compatibilized blends has been found to be increasing the rheometric-processing characteristics such as maximum viscosity and rate of cure. The magnitude of these values has been found to be higher for compatibilized blends and for 50/50 composition. The optimum cure time has been found to be decreasing with silica loading regardless of the presence of the compatibilizer. The magnitude of optimum cure time has been found to be higher for uncompatibilized system and for the composition with higher SBR content. Enhancement in mechanical properties with the addition of silica has been observed for compatibilized blends, more intensely than uncompatibilized samples. A good correlation between mechanical properties and solvent sorption behavior has also been observed.     

丁苯橡胶的合成工艺及发展

通用合成橡胶可代替天然橡胶,其中丁苯橡胶是产量最大的,也是工业化生产最早的橡胶之一,它由丁二烯单体和苯乙烯共聚生成。介绍了丁苯橡胶的结构特点、合成原理、应用和它的改性、发展前景等,并且以低温乳液聚合和溶液聚合法生产丁苯橡胶为例,对它的生产工艺和条件控制进行详细描述,最后对其发展前景做出简单描述。