Research on Maleic Anhydride Improving the Interfacial Compatibility of PLLA and OMMT by Grafting Method

摘要

Polylactic acid as a biodegradable polymer shows relative high rigidity,but it is brittle and has poor heat resistance,which greatly limits its application.The goal of this experiment is to prepare polylactic acid/organic modified montmorillonite nanocomposite by melting,and to enhance the material properties by improving the interfacial compatibility.First PLLA-g-MAH is prepared through reactive extrusion under initiator dicumyl peroxide,then PLLA /PLLA-g-MAH/OMMT nanocomposite is prepared by melt extrusion.Grafted rate was determined by infrared spectroscopy and chemical titration,and it get to peak when the content of maleic anhydride is 2 wt ％.Melt flow rate indicates the nanocomposite has better melt flow and better workability than pure PLA.Mechanical properties of the nanocomposite are best when the content of grafting is 3 wt ％.DSC shows that melting temperature and crystallinity of PLLA first increase and then decrease along with the increase of the PLLA-g-MAH,and both of them come to the top when PLLA-g-MAH is 3 wt ％.