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01-08-2010 | Issue 4/2010

Cellulose 4/2010

Thermo-mechanical properties of microfibrillated cellulose-reinforced partially crystallized PLA composites

Journal:
Cellulose > Issue 4/2010
Authors:
Lisman Suryanegara, Antonio Norio Nakagaito, Hiroyuki Yano

Abstract

Polylactic acid (PLA) in a crystallized state has mechanical properties at high temperatures superior to PLA in an amorphous state. However, a long annealing time is required to fully crystallize PLA. In this study, microfibrillated cellulose (MFC)-reinforced partially crystallized PLA composites were produced, with the goal of reducing the time required to fabricate PLA parts. A series of PLA/MFC composites at a fiber content of 10 wt% from degree of crystallinity (Xc) 0 to 43% was obtained by annealing at 80 °C. Although the annealing time required to obtain a composite (Xc: 17%) was only around one-seventh of the 20 min needed to fully crystallize neat PLA (Xc: 41%), both materials had comparable rigidity above the glass transition temperature (T g) and creep deformation at around T g. These results showed that partially crystallized PLA/MFC composite can replace fully crystallized neat PLA.

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