Alteration of the Surface Energy of Wood Using Lignin-(1-Phenylethene) Graft Copolymers

Autor:	Meng-Jiu Chen, Douglas J. Gardner, David W. Gunnells, John J. Meister
Rok vydání:	1995
Předmět:	chemistry.chemical_classification Birch wood General Chemical Engineering General Chemistry Polymer engineering.material Surface energy Contact angle chemistry.chemical_compound chemistry Coating Polymer chemistry engineering Copolymer Lignin General Materials Science Wetting
Zdroj:	Journal of Wood Chemistry and Technology. 15:287-302
ISSN:	1532-2319 0277-3813
DOI:	10.1080/02773819508009512
Popis:	Graft copolymers of lignin, made by free radical graft copolymerization of 1-phenylethene on lignin, increased the contact angle of water on birch wood (Betula papyrifera) and decreased the critical surface tension of the wood when coated onto the wood surface from an N, N-dimethylformamide solution. The coating of copolymer changed the wood from hydrophilic (∼50°) to hydrophobic (110°). The most pronounced change in contact angle was produced by benzene-soluble extracts of the reaction product. These extracts contained lignin with long poly(1-phenylethylene) sidechains and pure poly(1-phenylethylene). They produced surfaces with the numerically highest contact angles with water and changed the wetting behavior of the surface more than physical mixtures of lignin and poly(1-phenylethylene) or either of the pure polymers. Despite coating weights of less than 100 mg/cm, the critical surface tension of the birch wood coated with the various lignin-(1-phenylethylene) graft copolymers ranged from 26.9...
Databáze:	OpenAIRE
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