PLASTICIZING OF POLYLACTIC ACID (PLA) BIOPOLYMER WITH CITRATE ESTERS

Type : Article de conférence
Auteur(s) :  M. Maiza, M. T. Benaniba, A. HAMAM, M. MESSAOUDI, B. Bouchoul
Année :  2017
Domaine : Chimie
Conférence: THE FIRST ARAB CONFERENCE ON MECHANICAL ENGINEERING (ARCME’17)
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés :  Polylactic acid (PLA), Plasticizer; Citrate esters; Crystallinity, Triethyl Citrate (TEC), Acetyl Tributyl Citrate (ATBC)

Résumé : 

Triethyl citrate (TEC) and acetyl tributyl citrate (ATBC) were used as plasticizer for Polylactic acid (PLA). The treated and plasticized PLA at various concentrations were analyzed by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), melt ?ow index (MFI) and thermogravimetric analysis (TGA). Differential scanning calorimetry was used to evaluate the crystallinity and thermal property of all the samples. It was found that the glass transition temperature (Tg) and the melting temperature (Tm) decreased as the amount of citrate esters increased. Additionally, the presence of TEC or ATBC tended to increase the crystallinity of PLA. This result was supported by x-ray diffraction. DMA of plasticized PLA indicates that a decrease in Tg is obtained with increasing plasticizer content, Plasticizing effect was also shown by decrease in the dynamic storage modulus and viscosity of plasticized mixtures compared to the treated PLA. The TGA results indicated that ATBC and TEC promoted a decrease in thermal stability of the PLA.