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Ternary PVA nanocomposites containing cellulose nanocrystals from different sources and silver particles: part II.

Carbohydrate polymers (2013-08-06)
E Fortunati, F Luzi, D Puglia, A Terenzi, M Vercellino, L Visai, C Santulli, L Torre, J M Kenny
ABSTRACT

Cellulose nanocrystals (CNC) extracted from three different sources, namely flax, phormium, and commercial microcrystalline cellulose (MCC) have been used in a polyvinyl alcohol (PVA) matrix to produce anti-bacterial films using two different amounts of silver nanoparticles (0.1 wt% and 0.5 wt%). In general, CNC confer an effect of reinforcement to PVA film, the best values of stiffness being offered by composites produced using phormium fibres, whilst for strength those produced using flax are slightly superior. This was obtained without inducing any particular modification in transition temperatures and in the thermal degradation patterns. As regards antibacterial properties, systems with CNC from flax proved slightly better than those with CNC from phormium and substantially better than those including commercial MCC. Dynamic mechanical thermal analysis (DMTA) has only been performed on the ternary composite containing 0.1 wt% Ag, which yielded higher values of Young's modulus, and as a whole confirmed the above results.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Poly(vinyl alcohol), Mw 89,000-98,000, 99+% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), Mw 9,000-10,000, 80% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), 87-90% hydrolyzed, average mol wt 30,000-70,000
Sigma-Aldrich
Mowiol® 4-88, Mw ~31,000
Sigma-Aldrich
Poly(vinyl alcohol), Mw 13,000-23,000, 87-89% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), Mw 146,000-186,000, 99+% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), Mw 85,000-124,000, 99+% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), Mw 31,000-50,000, 98-99% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), average Mw 13,000-23,000, 98% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), average Mw 85,000-124,000, 87-89% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), Fully hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), average Mw 31,000-50,000, 87-89% hydrolyzed
Sigma-Aldrich
Mowiol® 10-98, Mw ~61,000
Sigma-Aldrich
Mowiol® 18-88, Mw ~130,000
Sigma-Aldrich
Poly(vinyl alcohol), average Mw 146,000-186,000, 87-89% hydrolyzed
Sigma-Aldrich
Poly(vinyl alcohol), average Mw 130,000, 99+% hydrolyzed
Sigma-Aldrich
Mowiol® 40-88, average Mw ~205,000 g/mol
Sigma-Aldrich
Mowiol® 4-98, Mw ~27,000
Sigma-Aldrich
Mowiol® 8-88, Mw ~67,000
Sigma-Aldrich
Mowiol® 28-99, Mw ~145,000
Sigma-Aldrich
Mowiol® 20-98, Mw ~125,000
Sigma-Aldrich
Mowiol® 56-98, Mw ~195,000
Sigma-Aldrich
Mowiol® 6-98, Mw ~47,000