橡胶材料加速老化试验与寿命预测方法研究进展

简要概述了橡胶材料加速老化试验方法,并总结了橡胶材料寿命预测方法在动力学、计算机仿真及本构模型领域的新进展。     

橡胶疲劳性能研究进展

综述了动态载荷下疲劳对橡胶物理机械性能的影响、影响橡胶疲劳的因素、橡胶疲劳性能的研究方法及橡胶疲劳的机理。指出橡胶制品的疲劳寿命取决于橡胶的抗疲劳断裂性能 ,研究橡胶的疲劳特性对于结构抗疲劳设计和疲劳寿命预报模型的建立是极其重要的。     

Interaction Between Fumed-Silica and Epoxidized Natural Rubber

Epoxidized natural rubber (ENR)/fumed silica vulcanizates were prepared by mechanical mixing method. Fumed silica content can affect mechanical properties of the composites, and ten parts per hundreds of rubber (phr) fumed silica lead to the best tensile strength. The interaction between ENR and fumed silica was characterized by Kraus equation, crosslink density (tested by NMR), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and scanning electron microscope (SEM). The results showed that the dispersion of silica in ENR was better than in natural rubber (NR), hydrogen bond was produced between ENR and fumed-silica in ENR/silica blends, and glass transition temperature of ENR/silica vulcanizate was higher than pure ENR vulcanizate. TGA and DMA confirmed that there was intense interaction between ENR and silica.     

喷雾干燥设备设计的数学模拟法

系统论述了喷雾干燥器内粒子的运动状态与风场流动特性及其数学模型的建立过程,在传递理论的基础上根据马歇尔方程计算了干燥过程中粒子与干燥介质之间的传质传热,通过求解粒子在干燥室内的运动方程而进行喷雾干燥设备设计的粒子运动轨迹法及设计计算程序的计算机实现过程,并用实验数据及理论解对程序的可靠性进行了论证。     

Reinforcing mechanisms of carbon nanotubes and high structure carbon black in natural rubber/styrene‐butadiene rubber blend prepared by mechanical mixing − effect of bound rubber

The reinforcing effect of high structure carbon black (HSCB) and multi‐walled carbon nanotubes (MWCNTs) on natural rubber/styrene‐butadiene rubber blend processed using mechanical mixing was comparatively investigated. In‐depth analysis by dynamic mechanical analysis, the Eggers ? Schummer model and Medalia's relationship showed that HSCB aggregates provided large internal pores leading to significant immobilized macromolecules in filled rubber. Additionally, a tubular immobilized rubber layer with a thickness of 8 nm was estimated for the rubber/MWCNT system based on dynamic mechanical analysis data. The mechanical performance of the HSCB filled blend was higher than that of the MWCNT filled blend at the same loading which was correlated to its higher bound rubber content. Both bound rubber content and filler anisotropy were found to govern the overall mechanical properties of rubber/MWCNT composites. Stress softening was correlated with rupture energy suggesting hysteretic failure mechanisms in both MWCNT and HSCB filled rubbers. © 2015 Society of Chemical Industry     

配合剂用量对橡／塑发泡鞋材性能的影响

采用“旋转组合试验设计方法”研究白炭黑、白艳华、树脂及发泡剂AC的用量对“橡/塑发泡鞋（底片）材”的密度、硬度、弯折回弹性及热收缩性能的影响,借助计算机“橡胶配方设计CAR”软件处理数据,拟合了相应的数学表达式。结果表明,这些性能同配合用量存在线性关系,白炭黑与AC用量对这些性能起着关键作用。     

Modeling the vulcanization reaction of silicone rubber

Characterization of the vulcanization process of silicone rubber was achieved through the modeling of dynamic DSC tests. The Kissinger equation and the Kamal‐Sourour model were used to determine kinetic parameters that fit the experimental data. The technique allows for the determination of the activation energy through Kissinger's model, which is then used to mathematically determine the other five parameters for the Kamal‐Sourour model. This novel technique finds a physically meaningful activation energy. The method generates a single set of parameters that accurately models all scanning rates tested (1, 2.5, 5, and 10 K/min). Five formulations of liquid silicone rubber as well as one solid silicone rubber were tested and modeled. For each material, the models generated fitting parameters that were in agreement with the dynamic DSC scans. The models were used to compare the processing of the liquid and solid silicone rubber. The characterization of both materials demonstrates the lower processing time, temperatures, and energy consumption when processing liquid silicone rubber, as compared to processing of hard silicone rubber. POLYM. ENG. SCI., 47:675–683, 2007. © 2007 Society of Plastics Engineers.     

21世纪的计算机辅助橡胶配方设计

分析了计算机辅助橡胶配方设计实现信息化所面临的问题，指出建立适合橡胶工业特点的数据库积极采用并改进橡胶配方优化设计的各种方法，结合神经网络技术及计算机软件工业的软件开发工具和思想，最络实现配方设计的智能化，网络化，是现代配方优化设计的发展方向。     

回归分析法在橡胶配方试验中的应用

应用均匀设计法设计橡胶配方,研究胶粉、白炭黑、炭黑和棕色树脂粉4种填料对SBR胶料密度、硬度、弯曲屈挠、耐磨耗等7项性能的影响。采用回归分析法拟合试验数据,得到优选的定量描述性能与填料变量之间关系的诸回归方程,利用它们优化和预测配方。验证试验表明,所优的配方密度小、硬度高、其它性能基本达到要求。全面显示了回归分析法在橡胶配方试验中应用的全过程,着重说明了使用回归分析法时不能忽略的几个问题：试验总数、回归模型、回归方程和回归系数的显性检验、剩余标准离差、回归方程的优选和验证试验。     

On the Role of Both Polypropylene Fibers and Silica Nanoparticles on the Viscoelastic Behavior of Silicone Rubber Nanocomposites

In the present study, silica nanoparticles and polypropylene fibers were added to silicone rubber matrix and their effect was investigated on the viscoelastic behavior of silicone rubber composites by dynamic mechanical analysis and compression set test. Bonding of the reinforcements with silicone rubber matrix was studied by Fourier transform infrared spectroscopy (FTIR). The results proved that the role of silica particles on the elastic modulus of silicone rubber was more effective than that of polypropylene at room temperature because of higher stiffness and also partial interaction of polypropylene with matrix.