Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 138, Issue 2, Pages 1287-1297Publisher
SPRINGER
DOI: 10.1007/s10973-019-08184-x
Keywords
Biopolymer; Poly(lactic acid); Ethylene vinyl acetate; Crystal structure; Annealing; Improved toughness
Funding
- Budapest University of Technology and Economics (BME)
- National Research, Development and Innovation Office [NVKP_16-1-2016-0012]
- Higher Education Excellence Program of the Ministry of Human Capacities of the Budapest University of Technology and Economics (BME FIKP-NANO)
- Piovan Hungary Kft.
- Tool-Temp Hungaria Kft.
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In this paper, we produced ethylene vinyl acetate copolymer (EVA)-filled poly(lactic acid) (PLA) blends by extrusion and injection moulding. We annealed the injection-moulded specimens at 80 degrees C, 100 degrees C, 120 degrees C and 140 degrees C to produce various crystal structures in PLA. Then we investigated the cross-effect between the crystal structure of PLA and the presence of EVA on the mechanical, impact, calorimetric, thermomechanical and heat deflection temperature properties of the blends. We found a synergistic toughening effect between the crystal structure of PLA that developed during annealing and the presence of dispersed EVA particles in the PLA matrix. The blend had a very high impact strength of over 65 kJ m(-2), which is three times higher than the impact strength of acrylonitrile butadiene styrene copolymer (similar to 20 kJ m(-2)), and thus it is very promising for technical applications.
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