Mechanochemically aminated multilayer graphene for carbon/polypropylene graft polymers and nanocomposites

eXPRESS Polymer Letters

L. Burk¹ 

关键词: nanocomposites;    carbon;    mechanochemistry;    graphene;    amination;   

DOI  :  10.3144/expresspolymlett.2019.24

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

The two-stage mechanochemical amination of graphite by dry ball milling of graphite in a planetary ball millunder Ar followed by NH3 yields aminated multilayer graphene (AMFG) as intermediates for carbon/polymer hybrids andnanocomposites. Opposite to efficient edge-selective graphene functionalization under Ar, CO2 and N2 pressure, the onestageball milling under NH3 pressure affords rather low N content (<0.5 wt%) and fails to reduce the graphite platelet size.According to DFT (Density Functional Theory) calculations NH3 exhibits low mobility between graphene layers and formsweak bonds to carbon which impair breakage of carbon bonds. In the two-stage ball-milling of graphite under Ar affords reactivecarbon nanoparticles which react with NH3 in the second stage. With increasing milling duration of the second stagethe nitrogen content increases to 3.2 wt%. As verified by XPS (X-ray photoelectron spectroscopy) measurements primaryamine groups are formed which couple with various dicarboxylic anhydride groups including maleated PP to produce imidefunctionalizedgraphene. This is of interest to produce compatibilizers and dispersing agents for carbon/PP nanocompositesexhibiting improved mechanical properties. Two-stage mechanochemistry holds promise for carbon nanoparticle functionalizationwell beyond amination.

【 授权许可】

CC BY