Influence of nanocellulose on mechanics and morphology of polyvinyl alcohol xerogels

TitleInfluence of nanocellulose on mechanics and morphology of polyvinyl alcohol xerogels
Publication TypeJournal Article
Year of Publication2019
AuthorsPramanik, R, Ganivada, B, Ram, F, Shanmuganathan, K, Arockiarajan, A
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume90
Pagination275-283
Date PublishedFEB
Type of ArticleArticle
ISSN1751-6161
KeywordsMechanics, Morphology, Nanocellulose, Xerogels
Abstract

Xerogels are porous networks of crosslinked polymers that are useful for biomedical applications such as drug delivery, scaffold engineering, tissue regeneration, cell culture and wound dressing. However, inferior mechanical properties curtail their applications to a considerable extent. Nanocellulose fibers and crystals are often added into the polymer matrix to improve their mechanical strength. Here, nanocellulose in the mass ratios of 7%, 13% and 18% are loaded into polyvinyl alcohol (PVA) matrix followed by thermo-morpho-mechanical characterization. With increase in nanocellulose content, thermal degradation occurs at a lower temperature. It is observed that addition of higher quantity of nanocellulose crystals leads to the formation of weak cellulose rich regions causing xerogel rupture. This is predominantly observed for xerogel loaded with 18% nanocellulose crystals. Similarly, addition of higher quantity of nanocellulose fibers increase brittleness of the xerogels causing fracture. This is predominantly observed for xerogel loaded with 18% nanocellulose fibers. Creep strain and stress relaxation is observed to decrease with addition of nanocellulose loading owing to molecular chain restriction and polymer chain immobility.

DOI10.1016/j.jmbbm.2018.10.024
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

3.239

Divison category: 
Polymer Science & Engineering