PHBV/cellulose nanofibrils composites obtained by solution casting and electrospinning process

Abstract

In this work, nanobiocomposites of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) reinforced with cellulose nanofibrils (CNFs) were produced by electrospinning and solution casting process. CNFs were obtained by sulfuric acid hydrolysis from Imperata brasiliensis fibers. Nanocomposites loaded with 1 (wt. %) of CNFs were prepared using a mixture of solvents chloroform (CHCl 3 ): N, N-dimethylformamide (DMF), in the ratio of 78:22 with 30 h of solubilization. Films by solution casting were obtained in a petri dish, at 50 °C for 1 hour, using drying casting temperature of 153 °C. Mats by electrospinning were obtained with a needle 20x10, drum collector rotation 27 rpm, and working distance of 10 cm. Films and mats were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC). It was possible to conclude that for nanobiocomposites obtained by solution casting, the addition of CNFs did not affect the transparency of the films, but provided a significant increase in the crystallization rate as observed by DSC analysis, while for electrospinning nanobiocomposites a considerable improvement in process increasing electrospinning time and quality of the mats manufactured, were observed.

Thermal and Barrier Characterizations of Cellulose Esters with Variable Side-Chain Lengths and Their Effect on PHBV and PLA Bioplastic Film Properties

“…Similarly, previous research on blends from PHBV and cellulose fillers, such as nanocrystalline cellulose, cellulose nanocrystals, cellulose nanofibers, and cellulose nanowhiskers, also suggested that cellulose fillers can restrict PHBV chain mobility through interfacial molecular chain interactions and result in decreased PHBV crystallinity in some cases . In addition, the crystal cellulose fillers (at a low concentration of <1%) can provide heterogeneous nucleation sites and act as an effective nucleation agent for PHBV crystallization, increasing the PHBV crystallization temperature and crystallization rate. − …”

Emerging Food Packaging Applications of Cellulose Nanocomposites: A Review

“… Fabrication strategies of nanocellulose-based composites: ( a ) solution casting, reprinted with permission from [ 144 ], 2017, Universidade Federal do Rio de Janeiro—UFRJ; ( b ) Layer-by-layer assembly (LBL), reprinted with permission from [ 54 ], 2019, Elsevier; ( c ) extrusion method, reprinted with permission from [ 145 ], 2022, Elsevier; ( d ) direct coating method, reprinted with permission from [ 146 ], 2021, Elsevier; ( e ) hydrogels, reprinted with permission from [ 147 ], 2022, Elsevier; ( f ) spray drying method, reprinted with permission from [ 148 ], 2022, Elsevier; ( g ) electrostatic spinning, reprinted with permission from [ 149 ], 2022, Elsevier; ( h ) micro-nanotechnology and nanoemulsions, reprinted with permission from [ 150 ], 2021, Elsevier; ( i ) adsorption, reprinted with permission from [ 151 ], 2022, Elsevier. …”

Cellulose-based electrospun nanofibers: a review

“…(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) in chloroform and DMF co-solvent system (Benini et al 2017) and poly(vinyl alcohol) (PVA) in water (Chahal et al 2013). In general, the blends and composites cited previously resulted in biocompatible NFs with a bead-free and smooth morphology, with a tendency to reduce porosity and to reduce or to change the crystalline structure of the polymers after the addition of cellulose.…”