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Journal of Polymers and the Environment

, Volume 26, Issue 7, pp 2793–2802 | Cite as

Effects of UV/Photo-Initiator Treatments on Enhancement of Crystallinity of Polylactide Films and Their Physicochemical Properties

Original Paper
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Abstract

Effects of UV/photo-initiator treatments on crystal formation and properties of polylactide (PLLA) films are investigated. Camphorquinone and riboflavin photo-initiator solutions in methanol are employed in the treatment of amorphous quenched PLLA films. Results from FTIR, ATR-FTIR, DSC, XRD, and SEM show evidence of crystalline domain formation dispersed throughout the film. 1H NMR and GPC results suggest that the molecular weights of the polymer slightly decrease after the treatment. This indicates that the treatment leads to a diffusion of the photo-initiators molecules through the film matrix, resulting in a low degree of PLLA chain scissions, and formation of carboxylic acid and hydroxyl polar end groups. This, in turn, induces PLLA crystallization, which imposes profound effects on surface wettability and physical and mechanical properties of the samples. The process can be applied in optimizing properties of PLLA films with shorter treatment times, compared to other methods, which is suitable for use in various fields; especially those that require specific characteristics like biomedical, packaging and environmental applications.

Keywords

Polylactide Photo-initiator Crystallization Glass transition temperature (\({{\text{T}}_{\text{g}}}\)Tensile test 

Notes

Acknowledgements

The authors acknowledge financial support from the National Research University (NRU) grant, provided from The Office of Higher Education Commission (OHEC), the Thammasat University Research Fund (Theme research), and the Center of Excellence in Materials and Plasma Technology (CoE M@P Tech), Thammasat University. Mijanur Rahman thanks the support from the Graduate Scholarship Program for Excellence Foreign scholarship (EFS) by SIIT.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  1. 1.School of Biochemical Engineering and Technology, Sirindhorn International Institute of Technology (SIIT)Thammasat UniversityPathum ThaniThailand

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