Polymer/CNTs Nanocomposites:Construction Of Interphase Structure And Performance Investigation

In this work,MMA was selected as monomer,C-CNTs prepared by blended acids oxidation reaction were utilized as nanofillers,and three different functional unsaturated monomers MTC?MPTC?BMI were used as modification molecules on the surface of C-CNTs and auxiliary comonomers with MMA.The polymer-based nanocomposites were fabricated through in situ suspension polymerization.Functional monomers were adsorbed on the surface of C-CNTs by non-covalent interaction and simultaneously copolymerized with MMA,therefore the interface structures between C-CNTs phase and polymer matrix phase were optimized.Due to different adsorption ways of three functional monomers on C-CNTs,the interface structures of respective fabricated nanocomposites between two phases were also different.FTIR?Raman?TGA?TEM?EDS?~1H-NMR and SEM were applied to investigate and analyze the acidification effects of C-CNTs,the adsorption effects of functional monomers on C-CNTs,the constitution and morphology of nanocomposite microspheres and the interface interaction between C-CNTs and polymer matrix,simultaneously the thermostability and mechanical performance of nanocomposites were also studied.The results suggest that,?COOH was successfully grafted on the surface of C-CNTs.C-CNTs didn't disturb the homopolymerization reaction of MMA and the copolymerization reaction of MMA with functional monomers,and the nanocomposite microspheres were successfully prepared.The twining and stacking of polymer molecule chains on the surface of BMI adsorbed C-CNTs were the tightest,and the interface interaction was the strongest,but the activeness of molecule chains was the lowest;the twining and stacking of polymer molecule chains on the surface of MTC adsorbed C-CNTs were the loosest,and the interface interaction was the weakest,but the activeness of molecule chains was the highest.The introduction of functional monomers could obviously improve the thermostability of nanocomposites,and the improvment effect of nanocompites with BMI was the best,in which the highest thermal degradation temperature was increased by 64.5°C.Because of the differences of interface structures between two phases,different functional monomers generated distinguishing enhancement and toughening effects on the mechanical performance of nanocomposites.MTC had the best toughening effects,and the highest tensile strain ar break was increased by 36.06%;BMI had the best enhancement effects,and the highest tensile strength was increased by 65.61%;both the enhancement and toughening effects of MPTC were ranked in the middle of MTC and BMI.