TY - JOUR
T1 - Photo-response of polylactide-poly(methyl methacrylate) blends
T2 - Effect of ultraviolet irradiation
AU - Huang, Po Ying
AU - Zhang, Yulin
AU - Ouyang, Hao
AU - Yang, Fuqian
AU - Lee, Sanboh
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/2/1
Y1 - 2022/2/1
N2 - 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.
AB - 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.
KW - Absorbance
KW - Kinetics
KW - PLA/PMMA blend
KW - Photo-stability
KW - UV irradiation
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U2 - 10.1016/j.matchemphys.2021.125528
DO - 10.1016/j.matchemphys.2021.125528
M3 - Article
AN - SCOPUS:85120898744
SN - 0254-0584
VL - 277
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 125528
ER -