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

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Abstract

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/m2 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.

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Acknowledgments

The GC-MS analyses were kindly performed by Dr. Alessia Andreotti at the Analytical Chemistry lab of the Department of Chemistry and Industrial Chemistry, the University of Pisa.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240, Shanghai, China

    Chengcheng Yang & Yongming Zhang

  2. Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126, Pisa, Italy

    Chengcheng Yang & Valter Castelvetro

  3. Istituto per i Processi Chimico-Fisici, Consiglio Nazionale delle Ricerche (IPCF-CNR), Area della Ricerca, Via G. Moruzzi 1, 56124, Pisa, Italy

    Valter Castelvetro

  4. Shanghai Key Laboratory of Advanced Polymeric Materials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, People’s Republic of China

    Chunpu Hu

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  1. Chengcheng Yang
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  2. Valter Castelvetro
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Correspondence to Valter Castelvetro.

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Yang, C., Castelvetro, V., Zhang, Y. et al. Facile hydrophobic modification of hybrid poly(urethane-urea)methacrylate aqueous dispersions and films through blending with novel waterborne fluorinated acrylic copolymers. Colloid Polym Sci 290, 491–506 (2012). https://doi.org/10.1007/s00396-011-2565-y

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  • DOI: https://doi.org/10.1007/s00396-011-2565-y

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