Abstract
Abstract Bamboo particle (BP)-reinforced poly(lactic acid) (PLA) biocomposites were fabricated. The effect of the BP particle size distribution on the pyrolysis and mechanical properties of PLA biocomposites was evaluated. The optimum particle size of BP for improving the tensile strength PLA biocomposites is 200 mesh (16.6–84.5 µm). The pyrolysis mechanism and kinetics were studied according to the Coats–Redfern method. The addition of BP inhibited the pyrolysis process of PLA. The activation energy of biocomposites ranged from 120.7 to 151.5 kJ/mol, which is significantly higher than that of the neat PLA. The pyrolysis mechanisms of biocomposites are attributed to the chemical reaction at low pyrolysis temperature (270–400℃) and ash layer diffusion control at high pyrolysis temperature (400–600℃). Crystallization behavior of biocomposites showed that small BPs in PLA biocomposites generated more cross-linking points in the PLA matrix, which constrained the movement of the molecular chain and acted as an effective nucleating agent in promoting the crystallization process. The pyrolysis behavior and mechanical properties analysis provide critical information for potential large-scale production of the PLA biocomposites.
Highlights
IntroductionTo expand the scope of application and reduce the production cost, poly(lactic acid) (PLA)–natural fiber biocomposites are attracting more research interests for their unique thermal and mechanical properties and low cost [5,6]
Traditional polymer products obtained from petroleum have been utilized for several decades and caused nonnegligibleTo expand the scope of application and reduce the production cost, poly(lactic acid) (PLA)–natural fiber biocomposites are attracting more research interests for their unique thermal and mechanical properties and low cost [5,6]
This study provided an essential reference for the preparation of PLA–lignocellulose biocomposites
Summary
To expand the scope of application and reduce the production cost, PLA–natural fiber biocomposites are attracting more research interests for their unique thermal and mechanical properties and low cost [5,6]. Incineration is a traditional way to dispose these BPs. Pyrolysis kinetics and mechanical properties of poly(lactic acid)/bamboo particle biocomposites 525. Pyrolysis kinetics and mechanical properties of poly(lactic acid)/bamboo particle biocomposites 525 It would discharge sulfur dioxide, nitrogen oxides and dust. To achieve large-scale production of PLA biocomposites, it is necessary to study the effect of BP size distribution on mechanical and thermal stability properties [12]. As the initial combustion stage of PLA biocomposites, pyrolysis has great influence on the thermal stability, ignition and heat diffusion process. The effects of particle size distribution (PSD) and different concentrations of NaOH solvent on the mechanical and pyrolysis properties of PLA/BP biocomposites were investigated. The toughening effect of BPs with different PSD-reinforced PLA biocomposites was investigated based on the three-level failure analysis model [16]. This study provided an essential reference for the preparation of PLA–lignocellulose biocomposites
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