Biocomposite material comprising CNF and anionic gelling polysaccharide
A technology of composite materials and gelled polysaccharides, applied in the direction of biological packaging, nanotechnology for materials and surface science, sustainable packaging industry, etc., can solve the problem of reducing the performance of barrier films
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Embodiment 1
[0052] Example 1: Comparison of materials prepared from different compositions
[0053] Material
[0054] CNF preparation
[0055] 2 wt% CNF gel was provided by RISE bioeconomy (formerly Innventia), Stockholm, Sweden. The CNF was obtained from dissolving grade pulp which had been carboxymethylated to a charge density between 500-600 μmol / g prior to fibrillation. The gel was further homogenized using a microfluidizer through three passes in a continuous 200-100 chamber configuration, diluted to a dry content of 0.2 wt% in a volume of 900 mL, and dispersed using a superhomogenizer at 13000 rpm for 20 minutes. Gels were centrifuged at 4100 xg for 1 hour to remove larger aggregates or flocs.
[0056] The size of the fibrils was determined by atomic force microscopy (AFM) by adsorbing CNF from a 0.001 wt% dispersion for 1 min onto a plasma-treated silicon wafer (boron-doped, p-type, 610–640 μm) that had been coated with A polyvinylamine anchor layer (Lupamin 9095, BASF) was p...
Embodiment 2
[0103] Example 2: Importance of interpenetrating networks formed by different treatments.
[0104] Material
[0105] CNF:alginate materials were prepared following two different routes to assess the importance of interpenetrating networks. The first is the formation of an alginate network when the CNFs are in a swollen state (with many voids between physically locked fibrils), and the other is when the CNFs are dry, that is, in a collapsed state. The first material was cross-linked by introducing calcium ions into a never-dried CNF:alginate filter cake in a swollen state in Milli-Q water, and the second material was made by first drying the CNF:alginate film to make it The structure collapses and the amount of voids between the fibrils is reduced, followed by the introduction of calcium ions for cross-linking. Reference samples of CNF membranes treated with calcium ions were also prepared when the membrane was dry and in the swollen state, respectively. All samples were tes...
Embodiment 3
[0124] Example 3: Comparison of different CNF:alginate ratios
[0125] Material
[0126] Membranes of CNF:alginate complexes cross-linked with calcium ions were prepared at weight ratios of CNF:alginate of 90:10, 50:50 and 10:90 to study the effect of CNF:alginate ratio on complex The influence of the mechanical properties of the material in the wet state ( Figure 12 ).
[0127] CNF:Alginate 90:10Ca 2+ Preparation of composite membrane:
[0128] The membrane was prepared as described in Example 1.
[0129] CNF Ca 2+ Preparation of nanopaper:
[0130] The reference nanopaper was prepared according to the method described in Example 1.
[0131] with Ca 2+ Preparation of cross-linked CNF:alginate 50:50 and 10:90 films:
[0132] 0.2 wt% dispersed CNF was mixed with ~0.4 wt% alginate solution at different CNF:alginate ratios (50:50 and 10:90). The dispersion (700 mg dry weight) was supermixed at 9000 rpm for 9 minutes, degassed and then solvent casted using a 9.5 cm di...
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