Abstract
This study aimed to improve the strength and hydrophobic properties of polyvinyl alcohol/microfibrillated-cellulose composite films and thereby solve problems such as the poor water resistance of polyvinyl alcohol films and defects in the packaging. Polyvinyl alcohol/microfibrillated-cellulose composite films were prepared with the silane coupling agent KH151. The mechanical, optical, crystalline, and other properties of the composite films were tested. After the modification of the polyvinyl alcohol/microfibrillated-cellulose films, their strength and hydrophobic and barrier property were greatly improved. Moreover, their oxygen transmittance decreased by 85.9%, and the water contact angle of the film surface increased by 44%. The internal structure of a polyvinyl alcohol/microfibrillated-cellulose film is formed by KH151, which improves the strength and barrier properties of the film, forms an alkane-based layer on the film surface, and improves the hydrophobic property of the film. Thermogravimetric analysis shows that the thermal stability of composite materials has been greatly improved.
Highlights
Microfibrillated cellulose (MFC) is prepared by using cellulose as a renewable material and is added to different polymer materials to increase their strength.[1]
The MFC prepared by the TEMPO oxidation method has a diameter of 2–4 nm, a length of several micrometers, and a high aspect ratio, all of which can improve the strength of composite materials.[1]
In a ratio of MFC:Polyvinyl alcohol (PVA) of 5:95, 2% glycerol and 1%–5% KH151 were added to the mixed solution to achieve a good configuration
Summary
Microfibrillated cellulose (MFC) is prepared by using cellulose as a renewable material and is added to different polymer materials to increase their strength.[1] Cellulose is treated in several ways, and TEMPO (2, 2, 6, 6-tetramethylpiperidine oxynitride) oxidation via the TEMPO/ NaBr/NaClO system is currently being used. This oxidation method uses the high selective oxidation of TEMPO to convert the primary hydroxyl group at the C6 position on the surface of the cellulose fiber into a carboxyl group, thereby improving the electrostatic repulsion of the fiber in the aqueous phase system.
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