Minimally processed date palm (Phoenix dactylifera L.) leaves fibers as natural fillers and processing aids in poly(lactic acid) composites designed for the extrusion film blowing of thin packages
| Autor: | José A. Covas, M. Haboussi, Mohamed Khlif, Hedi Nouri, Loic Hilliou, F. Kharrat, Chedly Bradai |
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| Přispěvatelé: | Universidade do Minho |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Palm leaf fibers Filler (packaging) Thermoplastic Materials science Film blowing Palm leaf fillers 01 natural sciences chemistry.chemical_compound Crystallinity Biopolymers Polylactic acid Ultimate tensile strength Engenharia dos Materiais [Engenharia e Tecnologia] Composite material chemistry.chemical_classification Biocomposites Science & Technology 010405 organic chemistry Polymer 0104 chemical sciences chemistry Engenharia e Tecnologia::Engenharia dos Materiais PLA Extrusion Elongation Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | Manuscript A bio-based and biodegradable film was manufactured by extrusion blowing of polylactic acid (PLA) based thermoplastic resin (PLSF) compounded with natural fillers obtained from minimally processed date palm leaves (DPLF). A neat PLSF reference film and films with different filler contents (1, 2 and 5 wt. %) were prepared and tested in tension along three directions: Machine direction (MD), transverse direction (MD) and 45° direction (45D). Adding DPLF up to 2 wt.% has a reinforcing effect, with an optimum around 1 wt.%. This optimum reinforcement translates in the enhancement of the apparent Young’s modulus, the tensile strength and the elongation at break, of about +29 % and +12 %, respectively, along the MD direction. Above 2 wt. % DPLF, the mechanical properties decrease because of a loss in film crystallinity, additional PLA thermal degradation triggered by the addition of the natural fillers and the poor adhesion between the fillers and the matrix. The mechanical anisotropy of films (larger tensile strength and elongation at break along MD) was increased by the addition of DPLF. This anisotropy was essentially explained by the amorphous polymer chain orientation along MD during blowing, which is promoted by the filler confining effect. Overall, this study shows that a waste from date palm leaves can be valorized for biodegradable film packaging applications Tunisian Ministry of Higher Education and Scientific Research and the French National Center for Scientific Research. This work was also funded by National Funds through FCT - Portuguese Foundation for Science and Technology, Reference UID/CTM/50025/2019. LH acknowledges funding from the FCT Investigator Programme through grant IF/00606/2014 |
| Databáze: | OpenAIRE |
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