Influences of Physical Aging on Enthalpy Relaxation Behavior and Thermo-mechanical Properties of Poly(lactic acid) Composite Films Reinforced with Cellulose Nanofilament
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초록
내용
Poly(lactic acid) (PLA) is a bio-degradable, thermoplastic, and aliphatic polyester, which is derived from renewable resources such as starch, corn, etc. To enhance the physical properties of pristine PLA and to expand its applications, PLA-based composites reinforced with various organic or inorganic nanofillers have been investigated extensively. Since the glass transition temperatures of PLA and its composites are around 60 °C, physical aging of PLA-based composites below glass transition temperatures induces a decrease in enthalpy, resulting in changing in thermos-mechanical properties. In this study, we fabricated a series of eco-friendly nanocomposite films based on PLA and cellulose nanofilament (CNF) via melt-compounding and compression. The enthalpy relaxation behavior, thermal transition, and thermos-mechanical properties of amorphous PLA/CNF nanocomposite films, which were aged physically at different temperatures and times, were investigated by using DSC and DMA.