Abstract: The acetylene functionalized monomer 1-etynylcyclohexylmethacrylate（ECMA） was used to synthesis ethynyl functionalized emulsion polymers with BA and MMA. And their structures were characterized by FT-IR， 1H NMR，GPC，etc. The emulsion formed a crosslinked latex film via thiol-yne click reaction. The changes of mechanical properties and heat resistance of the film before and after photocrosslinking were measured to evaluate the possibility of being used as the binder of waterborne coatings. The results showed that the retention percentage of
etynylwashigherthan 95% on ECMA during polymerization. The size of emulsion was lower than 50 nm and the distribution was even. The temperature at 5% weight loss of the crosslinked film was 60 ℃ higher than uncrosslinked film，indicating the significantly improved thermal stability. After cross-linking，the tensile strength of latex film increased，the elongation at break decreased，and the tensile strength increased by 3 times with the increase of ECMA content. In conclusion，the ethynyl functionalization provided a new and convenient way for crosslinking modification，and also provided a new method for the preparation of waterborne coatings.

Key words: acetylenefunctionalized, methacrylate, clickable, photo-crosslinking, latex film

摘要： 将乙炔基功能化的甲基丙烯酸酯单体 1-乙炔基环己基甲基丙烯酸酯（ ECMA）与丙烯酸丁酯、甲基丙烯酸甲酯进行三元乳液共聚，制备出炔基功能化的乳液，利用三羟甲基丙烷三（ 3-巯基丙酸酯）与炔基的巯 -炔光“点击”反应制得交联乳胶膜。采用 1H NMR、FT-IR、GPC等对聚合物的结构进行表征，并测试了光交联前后胶膜的力学性能及耐热性能的变化，从而评估其是否可以作为水性涂料基料。结果表明：在聚合过程中 ECMA上的乙炔基保留率在 95%以上；乳液平均粒径均小于 50 nm，且分布均匀；对于 ECMA-1，交联后失质量率为 5%时的温度比交联前升高 60 ℃，热稳定性显著提高；并且随 ECMA比例增大，交联后乳胶膜的拉伸强度逐渐提高， ECMA-3光交联后乳胶膜拉伸强度比未交联的提高 3倍，断裂伸长率有所减小。炔基功能化为甲基丙烯酸酯聚合物的交联改性提供了一种新的、方便的手段，也为制备水性涂料提供了一种新的方法。

关键词: 炔基功能化, 甲基丙烯酸酯, “点击”, 光交联, 乳胶膜

CLC Number: 

• TQ630.4