Influence of PBS, PBAT and TPS content on tensile and processing properties of PLA-based polymeric blends at different temperatures

• Published in: Journal of materials science Vol. 58; no. 4; pp. 1991 - 2004
• Main Authors: Dmitruk, Anna, Ludwiczak, Joanna, Skwarski, Mateusz, Makuła, Piotr, Kaczyński, Paweł
• Format: Journal Article
• Language: English
• Published: New York Springer US 2023; Springer Nature B.V
• Subjects: Additives; Biodegradability; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Cold crystallization; Compatibilizers; Crystallography and Scattering Methods; Deformation; Elongation; Evaluation; Extrusion molding; Formability; Glass transition; Injection molding; Materials Science; Modulus of elasticity; Polymer blends; Polymer Sciences; Polymers & Biopolymers; Production methods; Softening; Solid Mechanics; Stability analysis; Strain rate; Tensile properties; Tensile strength; Thermal stability
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-022-08081-z

PLA-based blends were prepared with different ratios of PBS, PBAT and TPS additives to adjust their mechanical and processing properties in various temperatures ( − 20 °C, 0 °C, 20 °C, 40 °C). Biodegradable polymeric specimens were obtained by preliminary extrusion and subsequent injection molding. Tensile properties, e.g., tensile strength, elongation at break, Young’s modulus and yield strength were evaluated. Next, melt flow and melt volume ratios were established. Softening, glass transition, cold crystallization and crystallization temperatures were determined with the use of the DSC method. Heat Deflection Temperatures for 1.8 MPa (HDT A) and 8 MPa (HDT C), as well as Vicat Softening Temperatures at 10 N (VST A) and 50 N (VST B), were examined. The manufacturing method was intentionally simplified to eliminate the need for additional mixture’s modification with compatibilizers. Each of the ductile compounds enhanced the deformability of PLA—most significantly in the case of PBAT and TPS, while at the same time reducing its tensile strength. The effect of the test conditions (strain rate and temperature) on the specimens was evaluated in order to determine the stability of the manufactured blends in dependence on these parameters.