Cellulose nanocrystals/polyurethane nanocomposites. Study from the viewpoint of microphase separated structure

► Well dispersed nanocrystals in polyurethane due to hydrogen bonding interactions. ► Low nanocrystals content in polyurethane nanocomposites leads to tough material. ► An increase in nanocrystals content induced soft and hard segment crystallization. ► Cellulose network formation can be affected wi...

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Bibliographic Details
Published in:Carbohydrate polymers 2013-01, Vol.92 (1), p.751-757
Main Authors: Rueda, L., Saralegui, A., Fernández d’Arlas, B., Zhou, Q., Berglund, L.A., Corcuera, M.A., Mondragon, I., Eceiza, A.
Format: Article
Language:English
Subjects:
Applied sciences
Atomic force microscopy
Cellulose - chemical synthesis
Cellulose - chemistry
Cellulose nanocrystals
Composites
Crystallization
Elasticity
Exact sciences and technology
Forms of application and semi-finished materials
Hard and soft segments
Nanocomposites - chemistry
Nanoparticles - chemistry
Polymer industry, paints, wood
Polymers - chemistry
Polyurethane
Polyurethanes - chemical synthesis
Polyurethanes - chemistry
Spectroscopy, Fourier Transform Infrared
Technology of polymers
Temperature
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Summary:► Well dispersed nanocrystals in polyurethane due to hydrogen bonding interactions. ► Low nanocrystals content in polyurethane nanocomposites leads to tough material. ► An increase in nanocrystals content induced soft and hard segment crystallization. ► Cellulose network formation can be affected with polyurethane microstructure. Cellulose nanocrystals (CNC) successfully obtained from microcrystalline cellulose (MCC) were dispersed in a thermoplastic polyurethane as matrix. Nanocomposites containing 1.5, 5, 10 and 30wt% CNC were prepared by solvent casting procedure and properties of the resulting films were evaluated from the viewpoint of polyurethane microphase separated structure, soft and hard domains. CNC were effectively dispersed in the segmented thermoplastic elastomeric polyurethane (STPUE) matrix due to the favorable matrix–nanocrystals interactions through hydrogen bonding. Cellulose nanocrystals interacted with both soft and hard segments, enhancing stiffness and stability versus temperature of the nanocomposites. Thermal and mechanical properties of STPUE/CNC nanocomposites have been associated to the generated morphologies investigated by AFM images.
ISSN:0144-8617
1879-1344
1879-1344
DOI:10.1016/j.carbpol.2012.09.093