Hydrophobic modification of cellulose fibres by cationic-modified polyacrylate latex with core-shell structure
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ORIGINAL PAPER
Hydrophobic modification of cellulose fibres by cationicmodified polyacrylate latex with core–shell structure Yuanfeng Pan • Huining Xiao • Zhaoping Song
Received: 13 September 2012 / Accepted: 22 November 2012 / Published online: 4 December 2012 Ó Springer Science+Business Media Dordrecht 2012
Abstract In cellulose fibre-based green packaging, the poor resistance or barrier against water or water vapour has remained as one of the key challenges. In this work, cationic polymer latex, butyl acrylate-costyrene/2-ethylhexylacrylate-co-methyl methacrylate (BA-co-St/EHA-co-MMA), with core–shell structure was especially synthesized and used as a wet-end additive to render the fibre or paper hydrophobic. TEM observation confirmed that the latex particles obtained indeed possessed desired characteristic of core–shell structure. The experimental results showed that the cationic polymer was especially suitable for use in papermaking processes due to its high retention with cellulose fibres. The surface modification of the natural fibre by the adsorption of cationic latex on the fibre surfaces potentially created the thin films of polymers on fibre surfaces. The resulting paper is highly hydrophobic with improved barrier property, as demonstrated by the high contact angles and relatively low WVTR value. Moreover, the mechanical properties of paper were maintained or even
Y. Pan H. Xiao (&) Z. Song Department of Chemical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada e-mail: [email protected] Y. Pan Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
improved in the presence of an appropriate level of the latex. Keywords Cellulose fibre Hydrophobic modification Barrier properties Nanosized latex Core–shell
Introduction Food packaging has become significantly more complex during recent years, mainly due to increased demands on product safety, shelf-life extension, cost efficiency, environmental issues and consumer convenience. In order to improve the performance of packaging to meet these varied demands, innovativemodified and controlled packaging materials have been developed and optimized for potential commercial use (Rhim and Ng 2007; Hult et al. 2010; Rodionova et al. 2011; Garcia-Ubasart et al. 2012). Currently these materials are largely produced from fossil-derived synthetic plastics, but with increasing environmental concerns, the materials derived from renewable resources are being extensively investigated as potential replacements. It is advantageous to replace the synthetic and metal packaging with natural cellulose fibre due to its green features (e.g., sustainable, biodegradable and environmental friendly). However, the barrier properties of unmodified cellulose fibre network or paper products
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are far insufficient for high-barrier applications, moisture barrier in particular. Surface treatment of paperboard for the im
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