Accelerated weathering performance of polylactide and its montmorillonite nanocomposite

Date

2016-03-01

Author

Kaynak, Cevdet

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The goal of this study was to compare accelerated weathering performance of neat polylactide (PLA) and its 1 mass% organically modified montmorillonite (Mt) nanocomposite; compounded and shaped by twin-screw extrusion melt mixing and injection molding, respectively. Accelerated weathering test system applied consecutive steps of UV irradiation and humidity in accordance with ISO 4892-3 standards for 200 h. Chain scission reactions such as photolysis, photooxidation and hydrolysis resulted in significant decrease in the molecular weight of PIA; consequently reductions in the mechanical properties of modulus, strength, ductility and toughness of the specimens occurred. However, after comparing mechanical properties of PLA and MtPLA before and after 200 h accelerated weathering, use of PLA with only I mass% Mt was extremely beneficial not only for "indoor applications" but also for "outdoor applications". This was due to the effective nanoscale reinforcing and barrier actions of intercalated/exfoliated Mt layers. For example, flexural strength was 6% beneficial before weathering, but after weathering the benefit was 88%.

Subject Keywords

Polylactide, Montmorillonite, Accelerated weathering, Photolysis, Hydrolysis

URI

https://hdl.handle.net/11511/30298

Journal

APPLIED CLAY SCIENCE

DOI

https://doi.org/10.1016/j.clay.2015.12.025

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

C. Kaynak, “Accelerated weathering performance of polylactide and its montmorillonite nanocomposite,” APPLIED CLAY SCIENCE, pp. 86–94, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30298.