Understanding the structural degradation of polymers and polymer-based materials is of practical importance in improving the reliability and lifespan of the associated structures and systems. In this work, we use differential scanning calorimetry to analyze the effect of ultraviolet (UV) irradiation on the physical aging of the blends of poly (lactic acid) (PLA) and poly (methyl methacrylate) (PMMA). Using the Cowie-Ferguson model and the Kohlrausch–Williams–Watts (KWW) stretch function, we determine the thermodynamic and kinetic contributions to the aging of the PLA/PMMA blends with and without UV irradiation. The analyses reveal the linear decrease of the maximum enthalpy loss of the aged specimen at the equilibrium state with the increase of the aging temperature, and the decreasing rate increases slightly with increasing the UV irradiation dose for the same PLA/PMMA blends. The activation energy associated with the kinetic contribution decreases with the UV irradiation dose for the PLA/PMMA blends of the same compositions.
|State||Published - Jun 14 2022|
Bibliographical noteFunding Information:
This work was financially supported by the Ministry of Science and Technology, Taiwan . We also thank the Taiwan Instrument Research Institute for providing instruments.
© 2022 Elsevier Ltd
- Activation energy
- Polymer blends
- UV irradiation
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry