Toughness improvement of poly(lactic acid) by the addition of pre-crosslinked powdered nitrile rubber/CaCO 3 for thermoforming molding
Source abstract
Abstract
Polylactide (PLA) is an eco-friendly biodegradable thermoplastic with excellent processability, demanding less energy to be produced compared to the petroleum-based polymers. However, PLA has drawbacks that impose some restrictions of uses use such as poor toughness property. Blending PLA with other polymers is a more practical and economic way to improve its toughness. The present study assessed the effect of the addition of the pre-crosslinked powdered nitrile rubber (NBR) containing calcium carbonate (CaCO 3 ) and extruder screw rotation on the mechanical, rheological, morphological and thermal properties of polylactide (PLA) by using a Central Composite Rotatable Design (CCRD) analysis, which provides statistical support for the experimental data. The results showed that NBR/CaCO 3 can be used as toughness modifier for PLA. This property improved due to the increase in energy expended to deform the material and generate cracks, as showed in the impact and morphological analyzes. Despite this improvement, the presence of CaCO 3 caused a slight decline in the thermal resistance of the composites. The influence of rubber (NBR/CaCO 3 ) content in PLA matrix on rheological properties, such as elongation viscosity, melt strength and drawability was also investigated. The results showed that the composition PLA/NBR/CaCO 3 with higher NBR/CaCO 3 content can be used in thermoforming applications.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: biodegradable polymer synthesis and properties · Additive Manufacturing and 3D Printing Technologies · Natural Fiber Reinforced Composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
Instituto de Química, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
Programa de Engenharia Ambiental, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
Centro de Tecnologia Mineral, Rio de Janeiro, RJ, Brazil
Funding
Conselho Nacional de Desenvolvimento Científico e Tecnológico
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