Journal
CARBOHYDRATE POLYMERS
Volume 75, Issue 1, Pages 22-31Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2008.06.005
Keywords
Wood pulp; Cellulose modification; Surface initiated ATRP; Ethyl acrylate polymerization
Categories
Funding
- MIUR-NANOPACK FIRB 2003 program
- project D.D.2186 Prot.N.RBNE03R78E (Italy)
Ask authors/readers for more resources
Wood pulp cellulose fibers were functionalized by partial esterification of the superficial -OH groups with alpha-bromoisobutyryl bromide (BIBB) under mild (room temperature and THF as solvent) and harsh (85 degrees C and pyridine as solvent) conditions. Samples were characterized by ATR spectroscopy, EDXS, elemental analysis and SEM. Functionalization degrees was varied up to 2% mol Br/OH (by elemental analysis) by varying reaction time and method, without affecting the fiber morphology, except for the highest modification degree, where external cell-wall was partially degraded. The BIBB-functionalized wood pulp cellulose was used as initiator for surface-initiated ATRP of ethyl acrylate in the presence or not of free-sacrificial initiator. Poly(ethyl acrylate) (PEA) modified fibers were characterized by ATR spectroscopy, SEM, thermogravimetric (TGA) and calorimetric (DSC) analyses. while ungrafted polymer was characterized by SEC. A direct correlation was found between the function-alization degree by BIBB and the amount of grafted polymer; products from 3% to 80% wt of grafted poly (ethyl acrylate) were obtained. Thermal destabilization of wood pulp fibers occurred because of the BIBB functionalization, which was recovered by the successive PEA grafting. Moreover, an increase of the glass transition temperature of the grafted polymer with respect to ungrafted one was observed. (C) 2008 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available