Journal
POLYMER
Volume 201, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.122625
Keywords
Nanocomposites; Graphene; Thermal analysis; Smart materials
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ) [NoE-26/202.417/2017]
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Reduced graphene oxide modified with vinyl laurate (rGO-VL) was incorporated to extruded blends of poly(3-hydroxybutyrate co-3-hydroxyvalerate) (PHBV) and poly(ethylene-co-vinyl acetate) (EVA) at different compositions. X-ray diffraction analyses showed decrease in crystallinity for the PHBV/EVA/rGO-VL hybrids in relation to the neat blends. Scanning electron microscopy images and dynamic mechanical analyses (DMA) indicated that well-dispersed rGO-VL sheets contributed to the blends compatibilization. DMA results revealed improved flexibility as the rGO-VL content was increased. Differential scanning calorimetry showed that EVA and rGO-VL acted synergistically to reduce PHBV crystal size. Tensile tests showed increased flexibility for PHBV/EVA/rGO-VL hybrids. Cyclic shape memory tests and folding-unfolding shape recovery tests revealed enhanced shape memory properties. For the PHBV/EVA blends at 50:50 and 25:75 compositions, the recovery rate (R-I) values were (83.1 +/- 7.4)% and (70.3 +/- 6.2)%, respectively. With the addition of rGO-VL at 1.0 mass%, R-I values higher than 97.0% and a shorter recovery time of similar to (3.8 +/- 1.7) s were achieved.
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