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 ONCGMA, 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. ONCALL and HNC-ALL were further functionalized by mono 6-[(mercaptotetramethylene) thiol]-β-cyclodextrin (CySH). GMA epoxide group was opened by water and by β- cyclodextrin (Cy) affording BNC-GMA-OH and BNCGMA-Cy. GMA and allyl appendages induce nanocellulose capability to adsorb 2-naphthol (2N) and amoxicillin (A).
Elena, V., Marco, Z., Andrea, B., Daniele, N., Sabrina, B., Carmen, F. (2016). Allyl, Glycidyl Methacrylate and Cyclodextrin-modified Nanocelluloses. Preparation, Characterisation and Adsorption-release Specific Properties. Washington D.C. : TechConnect.
Allyl, Glycidyl Methacrylate and Cyclodextrin-modified Nanocelluloses. Preparation, Characterisation and Adsorption-release Specific Properties
Daniele Nanni;
2016
Abstract
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 ONCGMA, 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. ONCALL and HNC-ALL were further functionalized by mono 6-[(mercaptotetramethylene) thiol]-β-cyclodextrin (CySH). GMA epoxide group was opened by water and by β- cyclodextrin (Cy) affording BNC-GMA-OH and BNCGMA-Cy. GMA and allyl appendages induce nanocellulose capability to adsorb 2-naphthol (2N) and amoxicillin (A).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
