Biocomposites based on poly(lactic acid)/Aloe Vera/Priplast. Effects of UVA radiation on the crystallization

Biocomposites based on poly(lactic acid) (PLA), Aloe Vera (AV), and Priplast (Pr), were produced with AV and Pr levels of 5% and 10%, and submitted to UVA radiation for a time interval up to 28 days. Chemical changes were investigated using Fourier transform infrared spectroscopy (FTIR) and the ther...

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Published inPolymers for advanced technologies Vol. 34; no. 9; pp. 3097 - 3110
Main Authors Nicácio, Pedro, Albuquerque, Ananda, Dantas, Lorena, Siqueira, Danilo, Ries, Andreas, Wellen, Renate
Format Journal Article
LanguageEnglish
Published Chichester, UK John Wiley & Sons, Ltd 01.09.2023
Wiley Subscription Services, Inc
Subjects
Aloe
Biomedical materials
Chromophores
Cold crystallization
Composite materials
Crystallization
Degree of crystallinity
Fourier transforms
Infrared spectroscopy
Photodegradation
PLA/AV/Pr biocomposites
Polylactic acid
pseudo‐Avrami
Radiation
Spectrum analysis
Thermodynamic properties
UVA radiation
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Summary:Biocomposites based on poly(lactic acid) (PLA), Aloe Vera (AV), and Priplast (Pr), were produced with AV and Pr levels of 5% and 10%, and submitted to UVA radiation for a time interval up to 28 days. Chemical changes were investigated using Fourier transform infrared spectroscopy (FTIR) and the thermal behavior was elucidated using differential scanning calorimetry (DSC); the non‐isothermal crystallization kinetics was modeled using the Pseudo‐Avrami model. FTIR spectra evidenced the formation of chromophore groups resulting from the photodegradation, which it was less intense in biocomposites with 10% Pr. AV addition promoted the cold crystallization, whereas the crystallization rate (ct) displayed higher values for PLA/10%AV, with slight increases in the degree of crystallinity (Xc); while Pr addition decreased the Xc and ct of PLA, and protected it more intensely against the photodegradation effects. Pseudo‐Avrami model presented R2 ≥ 0.9909 and a low discrepancy between experimental and theoretical data, being adequate to describe the cold crystallization of PLA biocomposites. Summing up, AV and Pr addition protect PLA against the harmful effects of photodegradation, with AV subtly interfering in the crystalline parameters while Pr provides greater amorphicity to PLA biocomposites.
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.6131