Study On The Preparation And Properties Of Lignin/PBAT Composites

Plastic represents one of the frequently-used materials in daily life,and the usage per head keeps increasing with the improvement of living standard,however the recycling and degradation of plastic remain the intractable issue of society and environment.With the advocation of harmonious development in current era,increasing attention is attached to developing environmentally benign and degradable new-type plastic to make full use of biomass feed stocks and residue of enzymolysis.In this review,prior to the preparation of new-type degradable plastic by blending lignin with PB AT in the addition of residue of enzymolysis,the modification of lignin methylation was conducted to enhance the plastic properties.Furthermore,the mechanism of the effeects of each procedure on plastic properties was also explored.Due to the poor interfacial compatibility,tensile strength and elongation at break decreased dramatically after adding lignin into PBAT.The resulting product by blending lignin with PBAT on a fifty-fifty basis showed tensile strength of 9.97 MPa and elongation at break of 59.61%,while the mechanical properties improved apparently after the graft of MAH onto PBAT-the tensile strength increased 120%.In this research,the tensile strength of the resulting composites increased 274.77%in the addition of 8%(w/w%)methylated lignin,which was attributed to the improvement of interfacial compatibility between lignin and PBAT.Adding fermented residue which underwent successively alkali and enzymolysis treatment into lignin/PBAT composite also enhanced the performance of the resulting products.The tensile strength increased to 10.90 MPa from 9.97 MPa and the elongation at break increased to 207.26%from 59.61%in an addition of 5%(w/w%)fermented residue having been subjected to a series of treatments,which was ascribed to the entwining effect of high content cellulose in the fermented residue.