| Full text | |
| Author(s): |
Total Authors: 3
|
| Affiliation: | [1] Universidade Federal de São Paulo. Laboratório de Tecnologia de Polímeros e Biopolímeros (TecPBio) - Brasil
[2] Universidade Federal de São Paulo. Laboratório de Tecnologia de Polímeros e Biopolímeros (TecPBio) - Brasil
[3] Universidade Federal de São Paulo. Laboratório de Tecnologia de Polímeros e Biopolímeros (TecPBio) - Brasil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | MATERIA-RIO DE JANEIRO; v. 25, n. 1 2020-04-06. |
| Abstract | |
ABSTRACT The development of polymer composites reinforced with natural fibers have gained attention as alternative technology for the processing of new material that provide a lower environmental impact, associated with lower density, biodegradability and interesting mechanical properties. Natural fibers that come from the green coconut have higher stiffness and mechanical resistance when compared with other natural fibers, considering its chemical composition. Although, natural fibers show a weak interaction with the polymer matrix, due to its hydrophilicity when compared to the matrix, hydrophobic. In this work, coconut fibers (CF) were chemically treated by alkalization with sodium hydroxide (NaOH) and mechanically treated by ultrasound in aqueous media. Low-density polyethylene (LDPE)/CF composites were prepared with different contents ofcoconut fiber (5 and 10 wt%), in the molten state using a homogenizer with high rotation (DRAIS) and stamping for the preparation of the specimens. The treated fibers were characterized by scanning electron microscopy (SEM) and the LDPE/FC composites were characterized according to the thermal properties (differential scanning calorimetry - DSC), mechanical properties (tensile tests) and morphology (SEM). From the results obtained, it can be concluded that no significant change was observed with the different treatments for composites with 5 wt% of CF compared to the neat LDPE. The best results of mechanical resistance noticedon composites with 5 wt% of CF when compared with composites with 10 wt% of CF. The ultrasound treatment demonstrated the best performance. The crystallization degree of the neat LDPE was not affected by the presence of the coconut fibers, although there was a good interaction and adhesion between the CF and thepolymer matrix. (AU) | |
| FAPESP's process: | 14/04900-9 - Development of UHMW-PE/LLDPE BLEND-BASED carbon nanotube nanocomposite for high impact applications |
| Grantee: | Fabio Roberto Passador |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 16/19978-9 - Development of PA6/LLDPE blend-based carbon black nanocomposites for antistatic packaging for electronic components |
| Grantee: | Fabio Roberto Passador |
| Support Opportunities: | Regular Research Grants |