Photo-response of polylactide-poly(methyl methacrylate) blends: Effect of ultraviolet irradiation

Po Ying Huang, Yulin Zhang, Hao Ouyang, Fuqian Yang, Sanboh Lee

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The applications of biodegradable polylactide (PLA) are dependent on its structural durability under service conditions. In this work, we analyze the temperature dependence of photo-stability of polylactide-poly(methyl methacrylate) (PLA/PMMA) blends after the irradiation of ultraviolet (UV) light. X-ray diffraction analysis of the UV-irradiated PLA reveals the crystalline phase formation at 55 °C, as confirmed by thermal analysis. The UV irradiation decreases the crystallization temperature of PLA. The thermal analysis and Fourier Transform Infra-Red (FT-IR) analysis illustrate the interaction between PLA and PMMA. We evaluate the photo-stability of the UV-irradiated PLA/PMMA blends from the temporal evolution of optical absorbance/transmittance of the blends. A first-order kinetic analysis is used to analyze the change of optical absorbance, controlled by the annihilation and generation of color centers. Two processes contribute to the photo-stability of the PLA/PMMA blends – one is annihilation-dominant for the blends with a large fraction of PMMA, and the other is generation-dominant for the blends with a large fraction of PLA. The combinational effect of UV irradiation and the interaction between PLA and PMMA determines the photo-stability of PLA/PMMA blends.

Original languageEnglish
Article number125528
JournalMaterials Chemistry and Physics
StatePublished - Feb 1 2022

Bibliographical note

Funding Information:
SL is grateful for the financial support from the Ministry of Science and Technology, Taiwan . We also thank the Taiwan Instrument Research Institute for providing instruments.

Publisher Copyright:
© 2021 Elsevier B.V.


  • Absorbance
  • Kinetics
  • PLA/PMMA blend
  • Photo-stability
  • UV irradiation

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics


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