Strong surface treatment effects on reinforcement efficiency in biocomposites based on cellulose nanocrystals in poly(vinyl acetate) matrix
2015 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 16, no 12, 3916-3924 p.Article in journal (Refereed) Published
In this work, the problem to disperse cellulose nanocrystals (CNC) in hydrophobic polymer matrices has been addressed through application of an environmentally friendly chemical modification approach inspired by clay chemistry. The objective is to compare the effects of unmodified CNC and modified CNC (modCNC) reinforcement, where degree of CNC dispersion is of interest. Hydrophobic functionalization made it possible to disperse wood-based modCNC in organic solvent and cast well-dispersed nanocomposite films of poly(vinyl acetate) (PVAc) with 1-20 wt % CNC. Composite films were studied by infrared spectroscopy (FT-IR), UV-vis spectroscopy, dynamic mechanical thermal analysis (DMTA), tensile testing, and field-emission scanning electron microscopy (FE-SEM). Strongly increased mechanical properties were observed for modCNC nanocomposites. The reinforcement efficiency was much lower in unmodified CNC composites, and specific mechanisms causing the differences are discussed.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2015. Vol. 16, no 12, 3916-3924 p.
Biochemistry and Molecular Biology Polymer Technologies
IdentifiersURN: urn:nbn:se:kth:diva-131466DOI: 10.1021/acs.biomac.5b01245ISI: 000366616700021ScopusID: 2-s2.0-84949844757OAI: oai:DiVA.org:kth-131466DiVA: diva2:656542
QC 201601152013-10-162013-10-162016-04-27Bibliographically approved