原位法制备聚甲基丙烯酸钐/丁腈橡胶纳米复合材料及其反应过程

采用Sm(OH)3和甲基丙烯酸(MA)经原位反应合成Sm(MA)3,以过氧化物为硫化体系制备了聚甲基丙烯酸钐[ Poly -Sm( MA)3]/丁腈橡胶(NBR)纳米复合材料,利用扫描电子显微镜、透射电子显微镜、傅里叶变换红外光谱以及广角X射线衍射分析研究了复合材料制备中的原位聚合过程.结果表明,有机稀土盐单体在原位分...     

新型核壳纤维增韧聚丙烯的研究

采用同轴静电纺丝技术制备聚碳酸酯为壳层,三元乙丙橡胶为核层的直径为300～600 nm的同轴纤维.将不同份数的核壳纤维与聚丙烯经过单螺杆混合,注塑后得到PP/核壳纤维复合材料.研究发现,核壳纤维用量在3份以下时,其在PP基体中的分散均匀,界面良好;核壳纤维的加入使PP的结晶速率提高,β晶含量先增大后减少;核壳纤维的用量为3份时,冲击性能较纯PP相比提高了22.17%.     

二氧化硅纤维/聚丙烯结晶性能及力学性能的研究

结合正硅酸乙酯(TEOS)溶胶-凝胶反应原理,通过静电纺丝技术制备了表面附有SiO<,2>粒子(硅球)的纳米SiO<,2>纤维.纤维经γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)预处理后(n-SF),首次与等规聚丙烯(iPP)通过单螺杆挤出机制得复合材料(n-SF/iPP).电子扫描显微镜表明,n-SF在iPP基体中分布均匀,界面结合良好,偏光显微镜(PLM)显示,n-sF的加入使得iPP晶粒细化,XRD计算知卢晶型相对含量约为空白样的2倍,冲击性能大幅上升.     

环保水溶性无铬封闭剂对金属/天然橡胶热硫化粘接剥离强度的影响

研究金属表面处理工艺对金属/天然橡胶（NR）热硫化粘接剥离强度的影响。结果表明：对金属进行脱脂、磷化和硅烷化处理能够有效增大金属/NR热硫化粘接剥离强度,3种处理工艺中对金属进行2次环保水溶性无铬密封剂GardoleneD6890浸渍可增大金属/NR热硫化粘接剥离强度;合理调控金属磷化时间、GardoleneD6890质量分数及其浸渍温度和浸渍后金属烘干温度能增大金属/NR热硫化粘接剥离强度;金属磷化时间为90 s、Gardolene D6890质量分数为5%及其浸渍温度为55℃时金属/NR热硫化粘接剥离强度最大,而提高GardoleneD6890浸渍后金属烘干温度能进一步增大金属/NR热硫化粘接剥离强度。     

一个橡胶补强的新观点

提出一个观点:在橡胶中填料之间相互作用的强弱可直观地用填料粒子间作用距离的不同来表示,同一种填料体系中,颗粒间存在着由强到弱的多级相互作用,这种多级相互作用距离服从正态分布,橡胶在外力作用下的应力-应变行为和动态性能均与填料颗粒间作用距离在外界应力作用下的变化有关。以此观点为基础,可细致分析并很好地解释应力-应变曲线中应力上翘现象、不同粒径的填料对橡胶材料模量的影响、填充橡胶的伸长率比纯胶大的现象、橡胶材料的疲劳生热问题、周期应力作用下滚动阻力测试中的温升现象以及炭黑补强橡胶的Payne效应。     

稀土防老剂对轮胎胎面胶的老化防护研究

研究稀土防老剂对轮胎胎面胶热氧和臭氧老化前后主要性能的影响,并与防老剂4010NA进行对比。结果表明:稀土防老剂对胶料热氧老化和臭氧老化的防护效果均优于防老剂4010NA;加入稀土防老剂Ⅰ的胶料具有较好的耐切割性能,热氧老化后撕裂强度保持率最大,对臭氧老化的防护效果最优;加入稀土防老剂Ⅱ的胶料经热氧老化后拉伸强度保持率最大,耐磨性能提高。     

Luminescent properties of Eu（OA）3（TTA）/NBR composites prepared by in-situ reaction

Eu(OA)3(TTA) (OA=cis-9-octadecenoic acid, TTA=4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione) complexes (Eu- complexes) containing the ligand OA with long molecular chains were synthesized. The Eu(OA)3(TTA) complexes and peroxide were added into nitrile-butadiene rubber (NBR) by mechanical shearing to get the uncured composites. The cured composites were obtained by vulcanizing the uncured composites at high temperature. The in-situ reaction including polymerization and grafting of Eu-complex took place at the curing process, which was verified by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations showed the fine dispersion of Eu(OA)3(TTA) complex (Eu-complex) in the cured composites compared with the uncured ones. Fluorescent spectra and Judd-Ofelt parameters analysis revealed that the fluorescent intensity increased approximate linearly with the content of Eu- complex increasing due to the in-situ reaction and long molecular chains of OA. The fluorescent lifetime of composites was longer than that of original Eu-complexes.     

Self-polymerization of Eu（TTA）3AA in rubber and their fluorescence effect

A simple europium complex,Eu（TTA）3 AA（TTA=4,4,4-trifluoro-1-（2-thienyl）-1,3-butanedione,AA=acrylic acid） was synthesized by a simple solution method.Then,two kinds of rubber matrix,nitrile-butadiene rubber（NBR） and silicone rubber（SiR） were used as the substrate for Eu（TTA）3 AA to prepare fluorescence composites.The neat Eu（TTA）3 AA complex showed the ability of self-polymerization when it was heated at 145 °C.It was found that the fluorescence intensity of the neat Eu（TTA）3 AA decreased over 70% when the polymerization time was over 25 min at 145 °C.The results also revealed that the polymerizated Eu（TTA）3 AA could be dispersed in nano-scale in two matrices and the luminescent intensities decreased 52% in NBR matrix,and 95% in SiR matrix compared with two relative compounds without crosslinking.To optimize the luminescence intensity of the composites,the Eu（TTA）3 AA polymerization kinetic process in matrix was investigated in detail by controlling the temperature,the crosslinking agent,etc.The results showed that the peroxide could accelerate Eu（TTA）3 AA self-polymerization in the rubber matrix,and therefore improved the dispersion,but not be helpful for the luminescence intensity enhancement.In addition,the relatively higher luminescence intensity in Eu（TTA）3 AA/NBR in comparison to that of Eu（TTA）3 AA/SiR might contribute to the interaction between nitrile group（–CN） in NBR and Eu-complexes,suggesting that the luminescence intensity of the composites also depended on the matrix characteristics.     

离子液体改性石墨烯在橡胶中的应用进展

综述了离子液体改性石墨烯的改性方法,及离子液体改性石墨烯在改善橡胶力学性能、热稳定性、导电性能、导热性能及气体阻隔性能等方面的应用现状及进展.     

炭黑和白炭黑增强NR的微观网络结构及动态性能

采用"填料粒子相互作用距离"的新观点,研究了炭黑和白炭黑增强的NR的填料网络结构和动态性能。结果表明,当白炭黑和炭黑填充份数相同时,由于白炭黑尺寸较小,在NR基体中相互作用距离小,易形成相互作用较强的填料网络。动态测试发现,白炭黑填充混炼胶比炭黑填充混炼胶具有更明显的Payne效应;白炭黑填充硫化胶具有更低的滞后损失和更小的生热。