Chitosan-based films reinforced with cellulose nanofibrils isolated from Euterpe oleraceae MART

Q2 Materials Science
DG Braga, Pgf Bezerra, Abfd Lima, HA Pinheiro, LG Gomes, AS Fonseca, L. Bufalino
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引用次数: 6

Abstract

The use of local raw materials for the production of biodegradable films can simultaneously contribute to the development of the Amazon and global sustainability. This work aimed to evaluate the physical and mechanical performance of chitosan-based bionanocomposite films reinforced with different loads of cellulose nanofibrils obtained from açaí (Euterpe oleraceae Mart.) under two nanofibrillation degrees. Nanofibrils were obtained by 3 and 21 passages in a grinder defibrillator. The films were produced by casting with nanofibril reinforcement at 5 wt.%, 10 wt.%, 15 wt.%, and 20 wt.%. The increase in the nanofibril level and nanofibrillation degree reduced water vapor absorption (75.20% to 51.93%), water solubility (28.33% to 17.91%), and density (0.87 g.cm−3 to 0.61 g.cm−3). The water vapor permeability decreased with higher nanofibril loads for both 3-pass (47.30% to 43.61%) and 21-pass (49.82% to 44.48%) reinforced films, but not with nanofibrillation degree. The increase in 3-pass nanofibril level decreased tensile strength (8.18 MPa to 7.88 MPa), modulus of elasticity (867.62 MPa to 670.02 MPa) and elongation at break (0.02 mm.mm−1 to 0.01 mm.mm−1). However, the opposite effect happened to 21-pass nanofibrils, with increases from 9.16 MPa to 9.73 MPa and from 502.00 MPa to 1119.62 MPa for tensile strength and modulus of elasticity, respectively. Meanwhile, the maximum elongation at rupture did not vary. It was concluded that chitosan-based bionanocomposite films reinforced with 20 wt.% of 21-pass nanofibril were more resistant, except for water vapor permeability. Adding coarser nanofibrils enhanced this property. The 3-pass nanofibrils reinforcement enables water solubility, which benefits other packaging applications.
木犀草科纤维素纳米纤维增强壳聚糖基薄膜
使用当地的原材料生产可生物降解的薄膜可以同时促进亚马逊的发展和全球的可持续性。本研究旨在评价不同负载的açaí (Euterpe oleraceae Mart.)纳米纤维素增强壳聚糖基生物纳米复合膜在两种纳米纤维强度下的物理力学性能。在研磨除颤器中通过3次和21次传代获得纳米原纤维。分别以5wt .%、10wt .%、15wt .%和20wt .%的纳米纤维增强剂进行浇铸制备薄膜。纳米纤维水平和纳米纤维程度的增加降低了水蒸气吸收率(75.20% ~ 51.93%)、水溶性(28.33% ~ 17.91%)和密度(0.87 g.cm−3 ~ 0.61 g.cm−3)。3通(47.30% ~ 43.61%)和21通(49.82% ~ 44.48%)增强膜的水蒸气透气性随纳米纤维负荷的增加而降低,但与纳米纤维强度无关。三道次纳米纤维含量的增加使抗拉强度(8.18 MPa ~ 7.88 MPa)、弹性模量(867.62 MPa ~ 670.02 MPa)和断裂伸长率(0.02 mm.mm−1 ~ 0.01 mm.mm−1)降低。21道纳米原纤维的拉伸强度和弹性模量分别从9.16 MPa和502.00 MPa增加到9.73 MPa和1119.62 MPa。同时,断裂时的最大伸长率没有变化。结果表明,添加20 wt.%的21通级纳米纤维增强壳聚糖基生物纳米复合膜,除透气性外,具有更好的耐水性。添加较粗的纳米原纤维增强了这一性能。3-pass纳米纤维增强使水溶性,这有利于其他包装应用。
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来源期刊
Polymers from Renewable Resources
Polymers from Renewable Resources Materials Science-Polymers and Plastics
CiteScore
3.50
自引率
0.00%
发文量
15
期刊介绍: Polymers from Renewable Resources, launched in 2010, publishes leading peer reviewed research that is focused on the development of renewable polymers and their application in the production of industrial, consumer, and medical products. The progressive decline of fossil resources, together with the ongoing increases in oil prices, has initiated an increase in the search for alternatives based on renewable resources for the production of energy. The prevalence of petroleum and carbon based chemistry for the production of organic chemical goods has generated a variety of initiatives aimed at replacing fossil sources with renewable counterparts. In particular, major efforts are being conducted in polymer science and technology to prepare macromolecular materials based on renewable resources. Also gaining momentum is the utilisation of vegetable biomass either by the separation of its components and their development or after suitable chemical modification. This journal is a valuable addition to academic, research and industrial libraries, research institutions dealing with the use of natural resources and materials science and industrial laboratories concerned with polymer science.
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