PBAT and cellulose blend
Cellulose is the most abundant natural polymer compound in the world, and the raw materials for production come from a wide range of sources. However, because cellulose contains a large number of polar groups such as hydroxyl groups and is more hydrophilic, it has poor interfacial compatibility with other resins, resulting in a decrease in the mechanical properties of the composite material. Therefore, cellulose needs to be modified before blending with PBAT.
Using nanofibrillated cellulose (NFC) with a mass fraction of 0.2% to 1% to blend with PBAT, NFC can increase the storage modulus and dynamic viscosity of the PBAT matrix, and at the same time increase the crystallinity of PBAT, which is an important factor for improving fillers. The dispersion in the matrix lays the foundation.
The polybutylene glutarate graft-modified cellulose nanocrystals (CNCs) reduced their hydrophilicity, and it was found that the tensile elastic modulus of the modified CNC-filled PBAT composites with a mass fraction of 10% increased compared with pure PBAT. increased by 50%, and the storage modulus increased by about 200%.
PBAT is filled with CNC chemically modified with phenylbutyl isocyanate. The tensile elastic modulus of the PBAT/CNC composite was increased by 55%, and the water vapor permeability was decreased by 63%, without impairing the biodegradability of PBAT.
Using octadecyl isocyanate grafted to modify CNC for blending PBAT, it was found that the mechanical properties and rheological properties of the nanocomposites were improved, and the hydrophilicity of CNC increased the biodegradability of the matrix.
In PBAT/acetylated cellulose nanostructure (CNS) composites, the acetyl group can improve the interaction between CNS and PBAT, thereby enhancing the mechanical and thermal properties of the composites, and creating a good infiltration network.
