Preparation and properties of EPR/PP/M-CNF nanocomposites
Cellulose nanofihers(CNF)were pretreated by alkali solution to obtain alkali pretreated cellulose nanofihers(APCNF),and then modified cellulose nanofibers(M-CNF)were obtained by binary ethylene propylene rubber grafted with ethylene alcohol(EPR-g-VA)copolymer solution.Then M-CNF was added to EPR/PP blend system to prepare EPR/PP/M-CNF nanocomposites.The microstructure,spherulite size,thermal stability and mechanical properties of EPR/PP/M-CNF nanocomposites were analyzed and tested by scanning electron microscope,polarizing microscope,thermogravimetric analyzer,dynamic thermomechanical analyzer and electronic universal testing machine.The results showed that EPR and EPR-g-VA coated APCNF formed a"core-shell"structure.Compared with EPR/PP blend,the thermal and mechanical properties of EPR/PP/M-CNF nanocomposites are significantly improved.The impact strength and initial thermal decomposition temperature of EPR/PP/M-CNF nanocomposites are 13.80 kJ/m2and 368.73 ℃,respectively.In addition,the spherulite size of PP phase in the composite decreases and the grain interface is blurred.