Polymeric film or coating comprising hemicellulose
a polymer film and hemicellulose technology, applied in the field of filmforming compositions and polymeric films or coatings comprising hemicellulose, can solve the problems of limited fossil resources on earth, increase of greenhouse effect, and general inability to degrade materials, so as to improve liquid/moisture resistance, reduce oxygen transmission, and improve the effect of liquid/moisture resistan
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example 1
[0072]This example illustrates the production of a film based on xylan, where the film-forming properties have been improved using the low molecular plasticizer xylitol. A series of films containing 20%, 27.5%, 35%, 42.5%, and 50% of added xylitol (dry weight) were investigated. A mixture of xylitol and glucoronoxylan from aspen with a total weight of 1 g was solubilized in 35 ml of water in 95° C. for 15 minutes. The solution was then poured onto polystyrene Petri dishes with a diameter of 14 cm. After drying in 23° C. and 50% RH for two to three days, transparent and more or less flexible films were obtained.
[0073]The molar mass of the glucuronoxylan was measured using size exclusion chromatography with 0.05 M LiBr in DMSO:water (90:10) as the mobile phase. The following PSS (Polymer Standard Service) column set was used: GRAM 30, 100, 3000 (8×300 mm) and guard column (8×50 mm). The flow rate was 0.4 ml / min at 60° C., resulting in a system pressure of 58 bar. The samples were diss...
example 2
[0079]This example illustrates the production of a film based on xylan, where the film-forming properties have been improved using the low molecular plasticizer sorbitol. The same procedure as in Example 1 was used except that sorbitol was used as plasticizer instead of xylitol and the series included three levels of plasticizers, namely 20%, 35% and 50% was investigated.
Content ofStress atStrain atO2-permeabilitySorbitol %break MPabreak %(cm3 μm) / (m2 d kPa)2035.42.0—3513.55.80.21503.910.4—
[0080]The flexibility of the films increased with increasing amount of sorbitol. The addition of sorbitol had only a minor effect on the relative crystallinity of the films. Normally, a decreased crystallinity results in reduced barrier properties.
[0081]The oxygen permeability of 0.21 (cm3 μm) / (m2 d kPa) shows that the film is a very good oxygen barrier.
example 3
[0082]This example illustrates the production of films made from xylan and polyvinyl alcohol. The same procedure as in Example 1 was used, but 0.75 g of polyvinyl alcohol (mw 20,000) was mixed with 0.25 g of xylan. Flexible films were formed. The measured oxygen permeability of the films was 0.18 (cm3 μm) / (m2 d kPa), which shows that the film is a very good oxygen barrier.
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