本文测定了甲基丙烯酸甲酯、丙酯、丁酯、庚酯、十六酯和乙酸乙烯酯共聚合作用中的竞聚率,其数值分别为r_1=22.21±0.89;73.3±7.4;62.1±3.8;60.4±0.4;68.3±3.2 r_2=0.072±0.026;0.186±0.038;0.127±0.015;0.271±0.039;0.135±0.055。其中自丙酯至十六酯的r_1、r_2值均在65及0.18左右说明酯族自三个碳原子增加十六个後竞聚率的变化仍然很小,这说明醇基的大小对单体活泼度的影响不大。 The copolymerization rates of methyl methacrylate, propyl ester, butyl ester, heptyl ester, hexadecyl ester and vinyl acetate were measured in this paper. The values ​​were r1 = 22.21 ± 0.89; 73.3 ± 7.4; 62.1 ± 3.8; 60.4 ± 0.4; 68.3 ± 3.2 r_2 = 0.072 ± 0.026; 0.186 ± 0.038; 0.127 ± 0.015; 0.271 ± 0.039; 0.135 ± 0.055. Among them, the values ​​of r_1 and r_2 from propyl ester to hexadecyl ester are both about 65 and 0.18, indicating that the change of the reactivity ratio of the ester group from the three carbon atoms is still small, Little effect of activity.