Journal
MATERIALS AND MANUFACTURING PROCESSES
Volume 33, Issue 15, Pages 1674-1680Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10426914.2018.1453153
Keywords
Additives; annealing; creep; crystallinity; kaolin; nucleation; poly(lactic acid); processing; stability; thermoforming; wood
Funding
- European Regional Development Fund (EFRE)
- province of Upper Austria through program IWB 2014-2020 - Upper Austria, project BioRest
- project Technology Agency of the Czech Republic (TACR) Centre of Advanced Polymeric and Composite Materials - Ministry of Education, Youth and Sports of the Czech Republic [TE 01020216]
- Program NPU I - Ministry of Education, Youth and Sports of the Czech Republic [LO1504]
- project Materials Research Centre - Sustainability and Development - Ministry of Education, Youth and Sports of the Czech Republic [LO1211]
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Thermal annealing as an additional polymer processing step or post-treatment processing step enables the structural changes of amorphous parts into crystalline parts. This paper investigates the feasibility of thermal annealing at 100 degrees C up to 90min used as an additional processing step to modify the crystalline structure and the thermo-mechanical stability of poly(lactic acid) (PLA). Moreover, the crystallization ability of PLA has been amended by the addition of 3wt% of wood flour and kaolin. The values of the degree of crystallinity and lamellar thickness determined by wide-angle-X-ray scattering showed that the thermal annealing of PLA samples modified with nucleating agents was an efficient processing step to increase the final crystallinity of PLA. Moreover, altered crystalline structure helped to improve the thermomechanical stability of PLA.
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