采用分步控温、结合种子乳液共聚法，合成了MMA/BA/AA/HEMA无皂乳液共聚物．对共聚物的应力-应变行为和动态力学性能分别进杆了研究．实验结果反映出MMA/BA、AA、HEMA以及外加助剂含量对共聚物相结构、力学性能有显著的影响．随着MMA含量增加，共聚物出现微相分离，断裂强度升高，伸长率降低．随着体系极性基因的增多，相分离趋势加大．这些实验结果揭示了共聚物宏观性能与微观结构间的内在联系． MMA / BA / AA / HEMA soap-free emulsion copolymer was synthesized by stepwise temperature control and seed emulsion copolymerization. The stress-strain behavior and dynamic mechanical properties of the copolymer were studied separately. The experimental results show that the content of MMA / BA, AA, HEMA and additives have a significant influence on the phase structure and mechanical properties of the copolymer. With the increase of MMA content, the copolymer appeared micro-phase separation, the breaking strength increased, the elongation decreased. With the increase of polar genes in the system, the trend of phase separation increased. These experimental results reveal the intrinsic relationship between the macroscopic properties of the copolymer and the microstructure.