Effect of MUF/Epoxy Microcapsules on Mechanical Properties and Fractography of Epoxy Materials

5th Annual International Conference on Material Science and Engineering

Ni, Zhuo^1 ; Lin, Yuhao^1 ; Du, Xuexiao^1

College of Chemistry and Chemical Engineering, Shenzhen University Shenzhen, China^1

关键词: Average diameter;    Bending properties;    Dynamic mechanical;    Interface morphologies;    Interfacial bonding;    Melamine urea formaldehydes;    Microcapsule content;    Toughening effects;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/275/1/012017/pdf
DOI  :  10.1088/1757-899X/275/1/012017

来源: IOP

【 摘 要 】

Melamine-urea-formaldehyde (MUF) microcapsules were synthesized, morphology, shell thickness, average diameter and interface morphology were studied by scanning electron microscope (SEM). The spherical MUF microcapsules are size normal distribution without adhesion and accumulation, being compact, rough and uneven with a thickness of 3.2μm and a core contents is approximate 70%. A latent imidazoleas the curing agent for a cross-linking chemical reaction for cracking repairing. A good dispersion of MUF microcapsules and a good interfacial bonding are obtained. Effects of MUF microcapsule size and content on bending property and dynamic mechanical propertywere investigated. Both bending strength and storage modulus of the composite are considerably reduced with an increasing addition of the microcapsules whereas the glass transition temperatures are almost not influenced. Significant toughening effects of MUF microcapsules on the epoxy composites are observed at the conditions of different content and size of microcapsule especially at low microcapsule contents and small microcapsule sizes.