Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 295, Issue 2, Pages 137-145Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.200900212
Keywords
biocompatibility; cellulose whiskers; freezing/thawing; reinforcement; sponges
Funding
- National Natural Science Foundation of China [30530850, 20874079, 20474048]
- National Support Project for Science and Technology [2006BAF02A09]
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Strong honeycomb like nanocomposite sponges were fabricated from starch and PVA by using repeated cycles of freezing and thawing and reinforcing with cellulose whiskers. Their structure and properties were investigated with WAXD, FT-IR, SEM, DMTA, rheological measurements, and LSCM. The results revealed that the repeated freezing/thawing cycles induced a physically crosslinked chain packing between starch and PVA, as well as a phase separation caused by the crystalline ice and syneresis. Thus, larger pores and tougher walls emerged in the sponges, leading to a high swelling degree. The sponges reinforced with cellulose whiskers exhibited improved dimensional stability and enhanced strength. These nanocomposite sponges are promising for wound dressing and tissue engineering applications.
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