Synthesis and analysis of properties of a new core-shell silicon-containing fluoroacrylate latex
Synthesis and analysis of properties of a new core-shell silicon-containing fluoroacrylate latex
复制标题
新型核壳型含硅氟丙烯酸酯乳液的合成及性能分析
DOI：
10.1002/pi.2660
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发表时间：
2009-11-01
影响因子：
3.2
通讯作者：
Luo Hongjie
中科院分区：
文献类型：
--
作者：
Liang Junyan;He Ling;Luo Hongjie
背景：含硅含氟丙烯酸酯共聚物是一种很有潜力的石质古建筑保护材料。本文通过将含氟丙烯酸酯共聚乳液与聚硅氧烷接枝，制备了一种新型的核壳型含硅氟丙烯酸酯乳液。采用种子乳液聚合和八甲基环四硅氧烷（D-4）开环聚合的方法，在非离子型乳化剂和新型氟-丙烯酸酯的混合乳化剂存在下，成功地合成了核壳型含硅氟丙烯酸酯乳液。含有阴离子乳化剂全氟辛烷磺酸钠。透射电子显微镜、X射线光电子能谱、静态接触角测量和扫描电子显微镜-能量色散X射线分析表明，当D-4含量控制在2.84- 4.36wt%时，含硅氟丙烯酸酯乳液呈现均匀的球形核，由于氟和硅原子在乳胶膜表面的缔合作用，使乳胶膜具有较强的疏水疏油特性。薄膜横截面呈现均匀致密的微观结构，无任何相偏析。此外，热重分析和拉伸测试结果表明，所有含硅氟丙烯酸酯共聚物均表现出更好的热稳定性和更高的柔韧性。结论：合成的核壳含硅氟丙烯酸酯乳液具有优异的表面性能、热稳定性和柔韧性，作为防护涂层具有令人鼓舞的应用前景。(C)2009年化学工业学会
BACKGROUND: Silicon-containing fluoroacrylate copolymers are potential materials for use in the protection of ancient stone buildings. In the work reported in this paper, a new core-shell silicon-containing fluoroacrylate latex was prepared through grafting of a fluoroacrylate copolymer latex with polysiloxane.RESULTS: The core-shell silicon-containing fluoroacrylate latex was successfully synthesized by seed emulsion polymerization and octamethylcyclotetrasiloxane (D-4) ring-opening polymerization in the presence of a mixed emulsifier consisting of a non-ionic emulsifier and a novel fluorine-containing anionic emulsifier sodium perfluoro-octane sulfonate. Transmission electron microscopy, X-ray photoelectron spectroscopy, static contact angle measurements and scanning electron microscopy-energy dispersive X-ray analysis showed that when the D-4 content was controlled at 2.84-4.36 wt%, the silicon-containing fluoroacrylate latex presented a uniform sphere core-shell structure and had strong hydrophobic and oleophobic characters due to the association of both fluorine and silicon atoms on the latex film surface. The film cross-section exhibited uniform and dense microstructure without any phase segregation. Additionally, thermogravimetric analysis and tensile test results indicated that all the silicon-containing fluoroacrylate copolymers displayed better thermal stability and higher flexibility.CONCLUSION: The synthetic core-shell silicon-containing fluoroacrylate latex showed excellent surface properties, thermal stability and flexibility, and has encouraging prospects in application as a protective coating. (C) 2009 Society of Chemical Industry