文献类型：期刊文献

英文题名：Facile hydrophobic modification of hybrid poly(urethane-urea)methacrylate aqueous dispersions and films through blending with novel waterborne fluorinated acrylic copolymers

作者：Yang, Chengcheng[2];Castelvetro, Valter[1,3];Zhang, Yongming[1,2];Hu, Chunpu[4]

机构：[1]Univ Pisa, Dipartimento Chim & Chim Ind, I-56126 Pisa, Italy;[2]Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China;[3]CNR, IPCF, Area Ric, I-56124 Pisa, Italy;[4]E China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat, Minist Educ,Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：290

期号：6

起止页码：491

外文期刊名：COLLOID AND POLYMER SCIENCE

收录：;EI(收录号：20122615185249);WOS:【SCI-EXPANDED(收录号:WOS:000303511000002)】；

语种：英文

外文关键词：Fluorinated latex; Latex blend; Hybrid film; Hydrophobic surface; Poly(urethane-urea); Perfluorononenyloxyethyl methacrylate

摘要：Aqueous dispersions of fluorinated particles (PBF) based on copolymers of butyl acrylate with 2-(perfluorononenyloxy)ethyl methacrylate (FNEMA), 2,2,3,3-tetrafluoropropyl acrylate, and 2,2,3,3,4,4,5,5-octafluoropentyl acrylate, respectively, were synthesized by emulsion polymerization in the presence of unfluorinated and fluorinated anionic surfactant binary mixtures. These fluorinated dispersions showed good to excellent colloidal stability, as determined by freeze-thaw, centrifugation, and critical coagulation concentration measurements. Blending of small amounts (1-10 wt.%) of PBF latex particles with a waterborne hybrid poly(urethane-urea)-methacrylate (PUUA) resulted in a series of slightly fluorinated modified PUUA with good film-forming properties and low surface energy. The precursor PUUA had been synthesized separately by simultaneous chain extension of a poly(ester-urethane)-diisocyanate with ethylenediamine and soapless free radical polymerization of methyl methacrylate swelling the resulting branched or slightly cross-linked poly(urethane-urea) self-dispersible ionomer particles. The results of dynamic light scattering and zeta potential measurements suggest that the merging of PUUA and PBF particles and either engulfing or interdiffusion of the incompatible macromolecular phases occurred to some extent already in the colloidal state. Highly hydrophobic films with surface energy as low as 17 mJ/m(2) were obtained upon the hybridization of PUUA with the FNEMA copolymer. Thermal annealing allowed minimizing the effects of fast surface dynamics, leading ultimately to water absorption, and promoting synergistic enhancement of the resulting hybrid film hardness, as required for coating applications.