Weathering degradation performance of PLA and its glass fiber reinforced composite

Date

2018-06-01

Author

Varsavas, S. Deniz
Kaynak, Cevdet

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

189
views

0
downloads

The objective of this study was to explore the degree of improvement in the resistance of biodegradable polylactide (PLA) structure against atmospheric weathering (outdoor) conditions when reinforced with only 15 wt% E-glass fibers (GF). For this purpose, both neat PLA and PLA/GF composite specimens were exposed to accelerated weathering conditions of both UV-irradiation and moisture cycles in accordance with ISO 4892-3 standards for various periods until 400 h. Many characterization techniques used revealed that the alterations in the structure and properties of the specimens were due to the drastic decrease in the molecular weight of the PLA matrices via chain scission reactions. It was observed that reductions in the mechanical properties (strengthmodulus- toughness) of the neat PLA were much more critical compared to the reductions in the PLA/GF composite. For instance, the reduction in the tensile strength of the neat PLA specimen was as much as 92%; while that reduction for the PLA/GF specimen was only 34%. Because, inorganic strong glass structure of the GF reinforcements having almost no chemical degradation during weathering periods kept their actions in the composite strengthening-stiffening-toughening mechanisms.

Subject Keywords

Polylactide, Short glass fibers, Accelerated weathering, Photolysis, Hydrolysis

URI

https://hdl.handle.net/11511/48566

Journal

MATERIALS TODAY COMMUNICATIONS

DOI

https://doi.org/10.1016/j.mtcomm.2017.11.008

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

Accelerated weathering performance of polylactide and its montmorillonite nanocomposite Kaynak, Cevdet (2016-03-01) 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 dec...
Consequences of accelerated weathering in polylactide nanocomposites reinforced with halloysite nanotubes Kaynak, Cevdet (2016-02-01) The purpose of this study was to explore consequences of accelerated weathering on the behavior of polylactide/halloysite nanotube composites. Nanocomposites were compounded by melt mixing method via a twin-screw extruder while specimens for testing and analyses were shaped by injection molding. Behaviors of the specimens were compared before weathering and after exposure to UV irradiation and humidity steps according to Cycle-C of ISO 4892-3 standards for a total duration of 300h. IR studies revealed that ...
Mechanical and thermal properties of polylactide/talc microcomposites: before and after accelerated weathering Kaynak, Cevdet (2016-06-01) The purpose of the first part of this study was to investigate effects of micron-sized talc content on the properties of polylactide (PLA). PLA/talc microcomposites were compounded by melt-mixing method via twin-screw extruder, while specimens for testing and analyses were shaped by injection molding. It was observed that, because of the effective stiffening, strengthening, toughening mechanisms of talc, and also their nucleation agent effects for higher crystallinity, many mechanical and thermal properties...
Influences of nanoclays on the flame retardancy of fiber-filled and unfilled polyamide-6 with and without aluminum diethylphosphinate Kaynak, Cevdet (2015-03-01) The objective of this study was to investigate contribution of nanoclays to the flame retardancy of polyamide-6 and its 15 wt% short glass fiber-reinforced composite with and without an organophosphorus flame-retardant aluminum diethylphosphinate. Nanocomposites were compounded by melt mixing method via twin-screw extruder, and the specimens for testing and analyses were shaped by injection and compression molding. Transmission electron microscopy and x-ray diffraction analyses indicated that nanoclay layer...
Processing and characterization of glass flake reinforced thermoplastic polymer matrix bio-inspried bulk lamellar composites / Güneş, Aylin; Dericioğlu, Arcan Fehmi; Department of Metallurgical and Materials Engineering (2014) The aim of this study was to develop processing pathways to fabricate glass flake reinforced bio-inspired composites with microstructural architecture similar to that of nacre using two processing routes based on hot-pressing and magnetic field assistance. Glass flakes with different aspect ratios were used as inorganic reinforcement in two different thermoplastic matrices, polystyrene (PS) and acrylonitrile butadiene styrene (ABS). Correlation between inorganic content, microstructural architecture and mec...

Citation Formats

S. D. Varsavas and C. Kaynak, “Weathering degradation performance of PLA and its glass fiber reinforced composite,” MATERIALS TODAY COMMUNICATIONS, pp. 344–353, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48566.