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以不同种类的偶联剂对空心玻璃微球表面改性,改性后的微球填充酚醛树脂制备了酚醛复合泡沫塑料。研究了空心微球改性前后的表面性能和酚醛复合泡沫塑料的弯曲强度、断裂韧性以及动态力学性能的变化。结果表明:经过偶联剂处理后的空心微球,降低了空心微球之间的团聚,增加了表面疏水性,改善了与基体间的相容性和界面性能,提高了复合材料的各项性能。不同种类偶联剂中,钛酸酯偶联剂以物理缠结的方式同酚醛基体聚合物链连接,硅氧烷偶联剂除部分与甲阶酚醛中的羟甲基有化学键合作用,大部分仍以物理缠结为主,戊二醛和硅氧烷协同改性通过形成缩醛结构将微球与基体连接起来,因此,在酚醛基复合材料中以戊二醛和硅氧烷偶联剂协同改性的效果最为明显。
Different types of coupling agent on the surface of hollow glass microspheres modified phenolic resin modified microspheres prepared phenolic composite foam. The surface properties of the hollow microspheres before and after modification and the flexural strength, fracture toughness and dynamic mechanical properties of the phenolic composites were studied. The results showed that the hollow microspheres treated with coupling agent reduced the agglomeration of hollow microspheres, increased the surface hydrophobicity, improved the compatibility with the matrix and the interfacial properties, and improved the properties of the composites performance. Different types of coupling agent, the titanate coupling agent is physically entangled with the phenolic matrix polymer chain, except for part of the silicone coupling agent and the phenolic hydroxyl methyl group has a chemical bond, large Some are still mainly physical entanglement, synergistic modification of glutaraldehyde and siloxane microspheres and matrix by the formation of acetal structure, so in the phenolic composite with glutaraldehyde and siloxane coupling Synergistic agent synergistic effect of the most obvious.