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机构地区:[1]四川大学高分子科学与工程学院,四川成都610065
出 处:《塑料工业》2016年第2期96-100,132,共6页China Plastics Industry
摘 要:为改善填充体系的混炼和分散效果,采用自行研制的强剪切混炼装置对环氧树脂(EP)/有机改性蒙脱土(OMMT)体系进行共混试验。通过对制得的试样进行冲击、拉伸、耐疲劳性能、动态力学性能测试以及X射线衍射仪(XRD)分析,来对比经过充分混炼与普通搅拌两种工艺下的复合体系中蒙脱土的分散状态以及改性效果。研究表明,通过圆锥式混炼器混炼得到的EP/OMMT复合材料与普通搅拌得到的复合材料相比,其冲击强度达到37.8 k J/m^2、拉伸强度达到89.97 MPa、循环拉伸次数达到1.37×10~5次,分别提高了26.9%、3.6%以及12.3%;其储能模量和玻璃化转变温度(T_g)高于普通搅拌得到的复合材料;其体系中的蒙脱土以完全剥离的状态分散在环氧树脂基体中,形成了性能优异的剥离结构。A home-made intensive shear and disperse mixer with the shape of conical was developed to improve the effects of mixing and dispersing of epoxy resin/organic modified montmorillonite blends. To compare the dispersion state and modification effect of the montmorillonite in the two composites system respectively mixed by the powerful shear mixer and common mechanical stirring, the impact strength, stress strength, fatigue performance and dynamic mechanical performance of the samples were investigated. Furthermore, the lamellar structure of montmorillonite in the matrix was characterized by X-ray diffraction. It is demonstrated that comparing to the composites mixed by common mechanical stirring, the impact and tensile strength, cycle tensile number of the samples mixed by the powerful shear mixer respectively reached 37.8 kJ/m^2, 89.97 MPa and 1.37×10^5, which respectively were 26.9%, 3.6%, 12. 3% higher than those of the composites mixed by common mechanical stirring; the storage modulus and glass transition temperature are higher than those of the samples mixed by common mechanical stirring; the montmorillonite in the composite mixed by the powerful shear mixer is dispersed uniformly in the matrix in the exfoliated state, forming the exfoliated structure with excellent performance.
关 键 词:环氧树脂 有机改性蒙脱土 混炼器 剪切 分散 疲劳性能
分 类 号:TB332[一般工业技术—材料科学与工程]
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