Biobased nucleation agents for poly-L-(lactic acid) - Effect on crystallization, rheological and mechanical properties.
Int J Biol Macromol
; 218: 588-600, 2022 Oct 01.
Article
em En
| MEDLINE
| ID: mdl-35843401
ABSTRACT
In the present work, the nucleating aptitude for poly-L-(lactic acid) (PLLA) of several biobased nanoparticles (NPs) with different morphologies and surface properties, including cellulose nanofibrils with and without lignin (LCNFs and CNFs) as well as cellulose, chitin and starch nanocrystals (CNCs, ChNCs and SNCs), was investigated. A single melt-processing step using a small amount of poly(ethylene glycol) (PEG) as carrier for the NPs was adopted to prepare films with the same nanofiller content of 1 wt%. The nucleation efficiency was investigated by differential scanning calorimetry using Avrami's and Lauritzen-Hoffman's secondary nucleation theory. The crystallization half-time was found to change considerably according to the morphology and surface properties of the NPs, with the lowest time observed for CNFs and CNCs, followed by ChNCs, SNCs and LCNFs. Comparing the surface energy components of the different nucleating agents, it was found that the nanofiller with the highest γp had the lowest t1/2 and demonstrated the most effective nucleating aptitude. The evolution of the melt rheological properties of the different compositions, and the mechanical and optical properties of the films with and without a short annealing treatment were also studied.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Celulose
/
Nanopartículas
Idioma:
En
Revista:
Int J Biol Macromol
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Tunísia