Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 7, Pages 4118-4126Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5081056
Keywords
shape memory; water-responsive; thermoresponsive; nonocomposite; cellulose nanocrystals
Funding
- National Basic Research Program of China (973 Program) [2012CB933600]
- National Natural Science Foundation of China [51173150, 51203130, 51373138]
- National Key Project of Scientific and Technical Supporting Programs - MSTC [2012BAI17B06]
- Research Fund for the Doctoral Program of Higher Education of China [20120184110029]
- Construction Program for Innovative Research Team of University in Sichuan Province [14TD0050]
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In this study, we developed a thermoresponsive and water-responsive shape-memory polymer nanocomposite network by chemically cross-linking cellulose nanocrystals (CNCs) with polycaprolactone (PCL) and polyethylene glycol (PEG). The nanocomposite network was fully characterized, including the microstructure, cross-link density, water contact angle, water uptake, crystallinity, thermal properties, and static and dynamic mechanical properties. We found that the PEG[60]-PCL[40]-CNC[10] nanocomposite exhibited excellent thermo-induced and water-induced shape-memory effects in water at 37 degrees C (close to body temperature), and the introduction of CNC clearly improved the mechanical properties of the mixture of both PEG and PCL polymers with low molecular weights. In addition, Alamar blue assays based on osteoblasts indicated that the nanocomposites possessed good cytocompatibility. Therefore, this thermoresponsive and water-responsive shape-memory nanocomposite could be potentially developed into a new smart biomaterial.
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