Preparation and properties of poly(lactic acid)/lignin blends with high lignin content
The escalating severity of environmental issues stemming from the poor degradability of conventional polymer materials has received an increasing concern.Biodegradable polymers such as poly(lactic acid)(PLA),have garnered considerable attention.However,their extensive utilization is hindered by the high cost associated with their use.To ad-dress this issue,the present study focuses on the development of PLA/lignin blends using glycidyl methacrylate(GMA)as a compatibilizer.The epoxy groups on the GMA molecule could react with the hydroxyl groups of lignin and two end groups of the PLA molecule,thus enhancing the interfacial compatibility between lignin and PLA.The effect of lignin and GMA contents on the performance of PLA was determined through analyzing the encompassing microscopic mor-phology,mechanical properties,thermal behavior,and rheological characteristics of the PLA/lignin blends.The results indicated that GMA effectively enhanced the interfacial compatibility between lignin and PLA,consequently improving the mechanical properties of the blends.The blend containing 30 wt%lignin exhibited tensile strength of 42 MPa,a ten-sile modulus of 1 750 MPa,flexural strength of 60 MPa,flexural modulus of 3 460 MPa,impact strength of 26.2 J/m,and elongation at break of 2.4%.Notably,when the lignin content increased to 60 wt%,the PLA/lignin blends exhibit-ed better performance.This approach retained the biodegradable characteristics of PLA but reduced its cost significantly.
万方数据
维普
