摘要
采用半连续种子乳液聚合法合成稳定的自交联核壳型苯丙乳液。考察了软硬单体配比、N-羟乙基丙烯酰胺(HEMAA)用量对乳液及涂膜性能的影响,初步探讨了HEMAA的改性机理。结果发现,当软硬单体配比m(St)∶m(BA)=2∶1,HEMAA添加量占主单体1%时,合成乳液聚合稳定性高,涂膜耐水性和热稳定性良好。傅里叶变换红外光谱、扫描电镜及透射电镜分析表明,HEMAA接枝到共聚物分子上且有明显的核壳结构;涂膜接触角及热重分析表明,涂膜的疏水性及热稳定性增强,水在涂膜上的接触角较改性前提高了5.26°,苯丙乳胶膜在实验条件下失重5%时,分解温度提高了58.03℃。
Self crosslinkable stable core-shell styrene-acrylic emulsion was synthesized by semi-continuous seed emulsion polymerization. Effects of the ratio of soft to hard monomer, N-hydroxyethyl amide （HEMAA） amount on the properties of emulsion and film were investigated. The HEMAA modification mechanism was preliminary studied. Results show that when the mass ratio of soft to hard monomer is 2∶1 （St∶BA）, the content of HEMAA is 1%, the emulsion polymerization stability is good, as well as the water-resistance and thermal stability of the film. The results of Fourier transform infrared spectroscopy （FT-IR）, scanning electron microscopy （SEM） and transmission electron microscopy（TEM） analysis indicate that the HEMAA is grafted to the copolymer and the obtained particles show obvious core-shell structure. Contact angle of the film and thermogravimetric analysis（TG） show that hydrophobicity and thermal stability of the film are enhanced and the contact angle of water on the film is improved by 5.26°, the thermal decomposition temperature of styrene-acrylic latex film is increased by 58.03 ℃, under the experimental conditions of 5% mass loss.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2017年第6期12-17,共6页
Polymer Materials Science & Engineering
关键词
N-羟乙基丙烯酰胺
核壳结构
苯丙乳液
涂膜性能
N-hydroxyethyl amide
core-shell structure
styrene-acrylic emulsion
film performance
