期刊
BIOMACROMOLECULES
卷 12, 期 4, 页码 942-948出版社
AMER CHEMICAL SOC
DOI: 10.1021/bm200101b
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada
- BASF Canada
- Canada Foundation for Innovation
Described is a new greener approach to increasing adhesion between wet cellulose surfaces. Polyvinylamine (PVAm) with grafted TEMPO spontaneously adsorbs onto cellulose and oxidizes the C6 hydroxyl to aldehyde. groups that react to form covalent bonds with primary amines on PVAm. Grafted TEMPO offers two important advantages over solutions of low-molecular-weight water-soluble TEMPO derivatives. First, the oxidation of porous cellulose wood fibers is restricted to the exterior surfaces accessible to high-molecular-weight PVAm. Thus, fibers are not weakened by excessive oxidation of the interior fiber wall surfaces. The econd advantage of tethered TEMPO is that the total dose of TEMPO required to oxidize dilute fiber suspensions is much less than that required by water-soluble TEMPO derivatives. PVAm-TEMPO is stable under oxidizing conditions. The oxidation :activity of the immobilized TEMPO was demonstrated by the conversion of methylglyoxal to pyruvic acid.
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