Assessing the performance characteristics of aluminum-doped PLA composites after exposure to environmental conditions

Makaleler > Tam Makale · 2025

Yazarlar: Alperen DOĞRU, CAHİT BİLGİ, AYBERK SÖZEN, Fırat MAVİ

JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2025, cilt 39, ss 3837-3865

DOI: 10.1177/08927057251408696

Özet

<p><span style="color: rgb(0, 0, 0);">This&nbsp;study&nbsp;investigates&nbsp;the&nbsp;impact&nbsp;of&nbsp;salt&nbsp;spray&nbsp;aging&nbsp;(per&nbsp;ASTM&nbsp;B117)&nbsp;on&nbsp;the&nbsp;mechanical,&nbsp;thermal,&nbsp;and&nbsp;morphological&nbsp;properties&nbsp;of&nbsp;aluminum-doped&nbsp;polylactic&nbsp;acid&nbsp;(PLA)&nbsp;composites&nbsp;fabricated&nbsp;using&nbsp;filament&nbsp;fed&nbsp;material&nbsp;extrusion-based&nbsp;additive&nbsp;manufacturing&nbsp;(MEX).&nbsp;Specimens&nbsp;containing&nbsp;25&nbsp;wt%&nbsp;Al&nbsp;were&nbsp;subjected&nbsp;to&nbsp;accelerated&nbsp;aging&nbsp;for&nbsp;2,&nbsp;4,&nbsp;and&nbsp;8&nbsp;weeks.&nbsp;The&nbsp;results&nbsp;indicated&nbsp;a&nbsp;dramatic&nbsp;degradation&nbsp;in&nbsp;mechanical&nbsp;properties&nbsp;after&nbsp;8&nbsp;weeks,&nbsp;with&nbsp;the&nbsp;ultimate&nbsp;tensile&nbsp;strength&nbsp;plummeting&nbsp;by&nbsp;approximately&nbsp;88%&nbsp;(from&nbsp;30.04&nbsp;MPa&nbsp;to&nbsp;3.66&nbsp;MPa)&nbsp;and&nbsp;elongation&nbsp;at&nbsp;break&nbsp;dropping&nbsp;to&nbsp;1.8%.&nbsp;Thermal&nbsp;analysis&nbsp;revealed&nbsp;a&nbsp;decrease&nbsp;in&nbsp;glass&nbsp;transition&nbsp;temperature&nbsp;(Tg)&nbsp;from&nbsp;68.45°C&nbsp;to&nbsp;67.25°C&nbsp;after&nbsp;8&nbsp;weeks,&nbsp;confirming&nbsp;polymer&nbsp;chain&nbsp;scission&nbsp;due&nbsp;to&nbsp;hydrolysis.&nbsp;The&nbsp;onset&nbsp;of&nbsp;thermal&nbsp;degradation&nbsp;also&nbsp;shifted&nbsp;to&nbsp;a&nbsp;lower&nbsp;temperature.&nbsp;Morphological&nbsp;examination&nbsp;via&nbsp;Scanning&nbsp;Electron&nbsp;Microscopy&nbsp;(SEM)&nbsp;unveiled&nbsp;severe&nbsp;interfacial&nbsp;debonding&nbsp;between&nbsp;the&nbsp;PLA&nbsp;matrix&nbsp;and&nbsp;aluminum&nbsp;particles,&nbsp;along&nbsp;with&nbsp;the&nbsp;formation&nbsp;of&nbsp;cracks&nbsp;and&nbsp;salt&nbsp;crystals,&nbsp;providing&nbsp;direct&nbsp;evidence&nbsp;of&nbsp;synergistic&nbsp;hydrolytic&nbsp;and&nbsp;corrosive&nbsp;degradation.&nbsp;In&nbsp;conclusion,&nbsp;the&nbsp;susceptible&nbsp;PLA/Al&nbsp;interface&nbsp;causes&nbsp;catastrophic&nbsp;failure&nbsp;in&nbsp;saline&nbsp;environments,&nbsp;necessitating&nbsp;strategies&nbsp;like&nbsp;coupling&nbsp;agents&nbsp;to&nbsp;ensure&nbsp;durability.</span></p>

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