Abstract
PEG (Polyethylene glycol) of biodegradable polymer materials were used to prepare (1 wt%, 3 wt%, 5 wt% and 7 wt%) PEG films. Polyvinyl alcohol (PVA) was added to the PEG solution and mixed films with different mass fraction ratios of PEG/PVA (2:0.66, 2:2 and 2:6) were produced. Sericin (SS) was added to the PEG/PVA mixed solution to make PEG/PVA/SS mixed films with different mass fraction ratios (2:1:2, 1:5:2, 1:5:1, 2:5:1 and 1:1:1). The scanning electron microscope, film thickness measurement, tensile test and the swelling degree and dissolution loss rate test were used to analyze the mixed film. The research results showed that under the experimental conditions the PEG blend film had good film forming properties. The thickness of the blend film increased with the increase of solute mass fraction. The break strength of the PEG/PVA blend film increased with the increase of PVA mass fraction. The break strength, break stretch and break elongation of the PEG/PVA/SS blend film were all good and increased with the increase of PVA content. The results of swelling degree and dissolution loss rate showed that both PEG/PVA and PEG/PVA/SS blend films had good water-holding properties. The dissolution loss rate of blended films was less than 50% besides PEG/PVA (2:2) and PEG/PVA/SS (1:1:1) blend film.
Highlights
Polyethylene glycol (PEG) is a kind of thermoplastic polymer material with good crystallinity and water solubility [1-4]
Silk sericin (SS) as a pure natural material has important value in the ingredients of cosmetics, but the film prepared from pure SS has defects in mechanical properties [17-18]
The thickness of the blend film increased with the increase of solute mass
Summary
Polyethylene glycol (PEG) is a kind of thermoplastic polymer material with good crystallinity and water solubility [1-4]. Polyvinyl alcohol (PVA) containing a large number of hydrophilic hydroxyl groups has good water solubility, thermal stability and film formation, etc [8-12]. Silk sericin (SS) as a pure natural material has important value in the ingredients of cosmetics, but the film prepared from pure SS has defects in mechanical properties [17-18]. A large amount of SS is discarded into the waste liquid, which wastes the biological resources [19-22]. The protection of the environment and the harmonious development of natural resources make the recycling and utilization of SS very important [23-24]. PEG, PVA and SS were used as raw materials to provide theoretical basis for the development of good biodegradable materials
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