改进的微乳液聚合制备的聚甲基丙烯酸甲酯的力学和光学性能研究

Mechanical and Optical Properties of PMMA Prepared by Modified Microemulsion Polymerization

研究了改进的微乳液聚合方法制备的聚甲基丙烯酸甲酯(PMMA)的力学和光学性能,并与本体聚合制备的PMMA相比较.研究结果表明,由改进的微乳液聚合制备的PMMA具有较高的Tg和富间规度,在较宽的温度范围内具有较高的力学模量.此外,它的拉伸强度、拉伸模量及断裂伸长率均比本体聚合制备的PMMA样品高.PMMA的折光率与制备方法关系不大,但由改进的微乳液聚合制备的PMMA样品消光系数更小,更加透明.这说明由改进的微乳液聚合方法制备的PMMA具有更广泛的应用前景.

The mechanical and optical properties of PMMA prepared by modified microemulsion polymerization （PMMA-MMP） have been investigated, and compared with those of PMMA prepared by bulk po- lymerization （PMMA-BP）. The results show that PMMA-MMP possesses higher Tg, tacticity, and higher mechanical modulus in a wide temperature range than PMMA-BP. Furthermore, the tensile strength, tensile modulus and elongation at break of PMMA-MMP are higher than those of PMMA-BP. The refractive index of PMMA is little concemed with the preparation method, however, the extinction coefficient of PMMA-MMP is smaller than that of PMMA-BP, i.e. PMMA-MMP is more transparent. These results indicate that PMMA-MMP has greater potential in application.