有机改性蒙脱土增强环氧/酚醛树脂力学性能研究

Study on Mechanical Properties of OMMT Modified Epoxy/Phenol Resin

通过原位聚合法制备了蒙脱土/环氧/酚醛纳米复合材料。通过DSC研究了催化剂TPP用量和固化温度的关系。结果表明:增加TPP用量可以有效地降低纳米复合材料的固化温度,确定了不同蒙脱土用量体系所需的最佳催化剂(TPP)用量。在此基础上,研究了纳米复合材料的力学性能和机械性能。研究表明:加入少量的蒙脱土(质量分数为2%)能够提高体系的拉伸强度,进一步增加蒙脱土的用量,拉伸强度降低但依然高于纯环氧酚醛体系;蒙脱土的加入可以有效地提高玻璃化转变温度和储能模量。

The nano-composite based on epoxy/phenol/montmorillonite （MMT） was prepared by means of in- situ polymerization. The relationship between catalyst TPP and curing temperature was studied by means of DSC. The result showed the increase of the content of TPP could effectively drop the curing temperature of the composite, and the optimum TPP content for the composites having different MMT contents was determined. The mechanical properties of the composite were studied. The results showed the tensile strength of the composite was improved greatly at the low MMT loading （2wt %）; with further increase of MMT content, the tensile strength was decreased, but still higher than that of the composite having no MMT. The result of DMA showed both glass transition temperatures and storage modulus of the composite increased with the incorporation of MMT.