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Effect of the nano-fibrillation of bamboo pulp on the thermal, structural, mechanical and physical properties of nanocomposites based on starch/poly(vinyl alcohol) blend

Author:
Guimarães Junior, Mario, Teixeira, FábioGomes, Tonoli, GustavoHenrique Denzin
Source:
Cellulose 2018 v.25 no.3 pp. 1823-1849
ISSN:
0969-0239
Subject:
Fourier transform infrared spectroscopy, X-radiation, atomic force microscopy, bamboos, cassava, cellulose, cellulose microfibrils, cohesion, crystals, differential scanning calorimetry, industry, mechanical properties, nanocomposites, nanofibers, plastic film, polyvinyl alcohol, pulp, scanning electron microscopy, starch
Abstract:
The current work aimed to evaluate the influence of adding bamboo cellulose nanofibrils on the performance of poly(vinyl alcohol)—PVA and modified cassava starch—FMM blend nanocomposites. Nanofibrils were produced after 5 and 30 passes through the mechanical defibrillator. Blends formed from PVA and FMM in an 80/20 ratio were used for casting preparation of the nanocomposites reinforced with 6.5% of nanofibrils. Atomic force microscopy showed the deconstruction of the fiber wall with release of the cellulose nanofibrils. A higher degree of nano-fibrillation occurred after 30 passes. The interaction between the polymers and the reinforcement after 30 passes was verified by Fourier transform infrared spectroscopy and scanning electronic microscopy. The higher nano-fibrillation promoted higher homogeneity, cohesion and more compact structure, thus promoting the formation of larger well-defined crystals, which acted as nucleating agents in the matrix, as demonstrated by differential scanning calorimetry and X-ray diffractrometry. It led to improvements of the physical, thermal and mechanical properties of the nanocomposites, conferring them great potential for applications in the plastic film industries.
Agid:
5909129