resumo
Expanded cork polymer composites (eCPC) using a PLA matrix and expandable microspheres (EMS) were developed and characterized. A blowing agent was introduced to evaluate its effect on cork structure in eCPC injected pieces. A chemical and thermal characterization was conducted using Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared-Attenuated Total Reflection (FTIR-ATR) to investigate the effect of cork and EMS in eCPC. The results have shown that the introduction of cork and EMS led to composites with up to 8% less density and with lower temperature of cold crystallization. The presence of cork in CPC and eCPC allowed to lower the cold crystallization temperature by almost 13 oC. It was found an increase on the crystallinity degree in the presence of cork and EMS. Scanning Electron Microscopy (SEM) was used to perform morphological studies. A recovered alveolar structure was found for cork cells in eCPC injected pieces.
palavras-chave
NONISOTHERMAL COLD CRYSTALLIZATION; CELL STRUCTURE; POLYPROPYLENE; MORPHOLOGY; BEHAVIOR
categoria
Materials Science; Physics
autores
Moutinho, LG; Soares, E; Oliveira, M
nossos autores
J. Martinho Oliveira
Professor Coordenadoragradecimentos
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. The authors are grateful to Amorim Cork Composites for the financial support, raw materials' supply and facilities' availability.