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- Title
New insights into the material chemistry of polycaprolactone-grafted cellulose nanofibrils/polyurethane nanocomposites.
- Authors
Tian, C.; Fu, S.; Meng, Q.; Lucia, Lucian
- Abstract
Polycaprolactone (PCL) was grafted to TEMPO-oxidized nanocellulose (TONCs) through a classical ring-opening polymerization reaction mediated by the surface TONC hydroxyl and carboxyl groups. The PCL increased the thermal stability and hydrophobicity without compromising the crystallinity. When TONCs and PCL-grafted TONCs (PTONC) were compared with respect to their perfusion within a segmented polyurethane matrix (CLPU), PTONC dispersed far better as evidenced by increased storage modulus and Young's modulus. The mechanical strength of the PTONC nanocomposites was nearly that of unmodified TONCs while at a low content (<3 wt%). Furthermore, PTONC in CLPU promoted micro-phase separation of the matrix leading to a smaller decrease in loss factor and elongation at break for the nanocomposites, highly superior to unmodified TONCs. Thus, PTONC as a reinforcement agent enhanced the mechanical properties and ductility of CLPU.
- Subjects
POLYMERS; POLYCAPROLACTONE; CELLULOSE nanocrystals; POLYMERIC nanocomposites; GRAFT copolymers; POLYURETHANES; THERMAL stability
- Publication
Cellulose, 2016, Vol 23, Issue 4, p2457
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-016-0980-4