乙烯-丙烯酸乙酯共聚物的水解反应及产物表征

Hydrolysis Reaction of Ethylene-ethyl Acrylate Copolymer and Characterization of the Hydrolysis Product

研究了乙烯-丙烯酸乙酯共聚物(EEA)的高分子化学反应.在强碱条件下水解EEA,得到具有两亲性质的乙烯-丙烯酸乙酯-丙烯酸(E-EA-AA)三元共聚物.研究了不同反应温度、反应时间、NaOH和丙烯酸乙酯(EA)单元摩尔比、甲苯和乙醇添加量等条件下EEA的水解度,对水解产物进行了傅里叶变换红外光谱(FT-IR)和核磁共振(NMR)表征.通过FT-IR和NMR测试,建立了EEA中EA含量的FT-IR标准工作曲线,可进行快速定量测试.对不同水解度的EEA水解产物进行了与水的接触角测试,以及作为热熔胶使用时对聚乙烯(PE)材料的黏结强度测试.结果表明:随着水解度增大,羧基含量增加,与水的接触角减小,亲水性增加;当水解产物EA和丙烯酸(AA)质量分数分别在22.6%和4.6%左右时,对PE的黏结强度最高.

In this paper, macromolecule chemical reaction of ethylene-ethyl acrylate copolymer （EEA） was studied. Ethylene-ethyl acrylate copolymers were hydrolyzed in strong alkaline conditions to ethylene-ethyl acrylate-acrylate acid （E-EA-AA） terpolymers, which are amphiphilic.The effects of different reaction temperature, reaction time, molar ratio of sodium hydroxide （NaOH） and ethyl acrylate （EA） unit,the amount of toluene and ethanol on the hydrolysis degree of EEA were studied. And the hydrolysis prod- uct was characterized using Fourier transform infrared （FT-IR） spectrometer and nuclear magnetic resonance （NMR） spectrometer. The FT-IR standard working curve of the composition of EA in EEA was established through FT-IR and NMR measurements, which can be used for quick and quantitative tests. Contact angle with water and the adhesive strength to polyethylene （PE） of the hydroly- sis product were measured.The results showed that with the increasing degree of hydrolysis,carboxyl content increased,and contact angle with water decreased,which indicated improved wettalility of the resin surface.When the mass fraction of EA and acrylate acid （AA） were around 22.6% and 4.6% respectively,the hydrolysis product had the highest adhesive strength to PE.