| Full text | |
| Author(s): |
Lívia Maria Garcia Gonçalves
[1]
;
Talita Rocha Rigolin
[2]
;
Bianca Maia Frenhe
[3]
;
Sílvia Helena Prado Bettini
[4]
Total Authors: 4
|
| Affiliation: | [1] Universidade Federal de São Carlos. Departamento de Engenharia Material - Brasil
[2] Universidade Federal de São Carlos. Departamento de Engenharia Material - Brasil
[3] Universidade Federal de São Carlos. Departamento de Engenharia Material - Brasil
[4] Universidade Federal de São Carlos. Departamento de Engenharia Material - Brasil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 23, n. 5 2020-11-23. |
| Abstract | |
Poly (lactic acid) (PLA) was submitted up to five cycles of extrusion in order to evaluate the effect of mechanical recycling. The material was evaluated under two conditions, thoroughly dried before processing and without drying. The changes in the molecular weight, acidity, thermal properties and coloring were assessed after each extrusion, and with this information, mechanisms of degradation were purposed. Molecular weight was reduced at a maximum of 30% after the most aggressive condition; five cycles without drying, which caused also an increase in acidity due to hydrolysis. Thermal properties were not significantly altered, which in combination to the molecular weight decrease allow to infer the recyclability of PLA. However, the most degraded samples had developed strong yellowing, particularly for samples without drying, which could be a problem for final products. (AU) | |
| FAPESP's process: | 11/21313-1 - Study of the reaction kinetic and the addition of the metal deactivators in the grafting of maleic anhydride onto polypropylene in the presence and absence of the nanoparticles |
| Grantee: | Silvia Helena Prado Bettini |
| Support Opportunities: | Regular Research Grants |