Maleic Anhydride Polylactic Acid Coupling Agent Prepared from Solvent Reaction: Synthesis, Characterization and Composite Performance
| Autor: | Helena Oliver-Ortega, Rafel Reixach, Francesc Xavier Espinach, José Alberto Méndez |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Agencia Estatal de Investigación |
| Rok vydání: | 2022 |
| Předmět: |
Technology
Polymers Fibra de celulosa Biodegradable plastics Enginyeria dels materials [Àrees temàtiques de la UPC] Polylactic acid Ácido poliláctico (PLA) coupling agent Polylactic acid (PLA) General Materials Science polylactic acid (PLA) 3312.09 Resistencia de Materiales biocomposites Microscopy QC120-168.85 Biocomposites Ensayos (propiedades o materiales) Materials compostos QH201-278.5 Composite materials Engineering (General). Civil engineering (General) TK1-9971 Polímers Resistencia a tracción Àcid polilàctic Descriptive and experimental mechanics 3312.12 Ensayo de Materiales Coupling agent 2304.02 Celulosa Electrical engineering. Electronics. Nuclear engineering TA1-2040 Plàstics biodegradables |
| Zdroj: | Materials, Vol 15, Iss 1161, p 1161 (2022) Materials; Volume 15; Issue 3; Pages: 1161 Materials, 2022, vol. 15, núm. 3, p. 1161 Articles publicats (D-EQATA) DUGiDocs – Universitat de Girona instname |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma15031161 |
| Popis: | In the present work, a functionalization of polylactic acid (PLA) has been carried out to anchor maleic anhydride onto the main polymer chain to promote improvement in the compatibility of this polymer matrix with cellulose fibres. Low-molecular-weight PLA has been reacted with maleic anhydride following different procedures: a bulk reaction in an internal mixer and a solution reaction. The presence of oxygen during bulk processing did not allow for functionalization, guiding the reaction towards a decrease in the molecular weight of the material. On the contrary, a controlled reaction under an inert atmosphere in the presence of dioxane as the solvent, at reflux temperature, led to the functionalization of the polymer reaching different yields depending on the percentage of radical initiator and maleic anhydride added and reaction time. The yield of functionalization has been monitored by acid number titration as well as 1H NMR, with optimal yield values of functionalization being up to 3.5%. The PLA-functionalized formula has been used to make commercial PLA compatible with cellulose fibres derived from a thermomechanical treatment. The addition of 10% w/w of fibres to PLA increases the ultimate tensile strength (UTS) of PLA by up to 15%. The incorporation of 4 w/w of the already-functionalized coupling agent to the composite produces improvements in UTS of up to 24% regarding PLA, which confirms the functionalization from a performance point of view This research was funded by Spanish government MINECO in the framework of project MAT2017-83347-R |
| Databáze: | OpenAIRE |
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