Allyl, glycidyl methacrylate and cyclodextrin-modified nanocelluloses. Preparation, characterisation and adsorption-release specific properties

resumo

Oxidized (ONC) and hydrolyzed (HNC) nanocelluloses were prepared from high-grade pure cotton fibers (CFT), too short to be spun. They maintained the CFT crystallinity (IC=0.59). ONC and HNC were fully O-allylated affording ONC-ALL and HNC-ALL, respectively. ONC-ALL and HNC-ALL became completely amorphous. Bacterial nanocellulose (BNC) and ONC were graphted with glycidyl methacrylate (GMA) affording BNC-GMA and ONC-GMA, respectively. Substitution degree (DS=GMA residue versus glucose unit) range in BNC-GMA and ONC-GMA is 0.4-0.6. As GMA grafting forms a new C-C bond between cellulose and GMA and keeps OH cellulose groups unchanged, GMA nanocellulose maintains the cristallinity of the starting nanocellulose. The non polar allyl and GMA appendages decrease the hydrophilicity of cellulose. ONC-ALL and HNC-ALL were further functionalized by mono 6-[(mercaptotetramethylene) thiol]-_-cyclodextrin (CySH). GMA epoxide group was opened by water and by _-cyclodextrin (Cy) affording BNC-GMA-OH and BNC-GMA-Cy. GMA and allyl appendages induce nanocellulose capability to adsorb 2-naphthol (2N) and amoxicillin (A).

palavras-chave

Acrylic monomers; Cyclodextrins; Hydrophilicity; Spinning (fibers); Allyl chlorides; Amoxicillin; Beta-cyclodextrin; Crystallinities; Glycidyl methacrylate; Nano-cellulose; Specific properties; Substitution degree; Cellulose

autores

Vismara E., Zarattini M., Bemardi A., Nanni D., Bertini S., Freire C.

nossos autores

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".