Modification Of Nanodiamond And Cure Kinetics Of Nanodiamond-filled Epoxy Resin

Nanodiamond?ND?has attracted much attention in recent years.ND is an outstanding nanoparticle which not only has the advantage of nanoparticle,like high specific surface area,high active surface,quantum effects,small size effect,but also expresses outstanding properties,like remarkable thermal condition,distinguished optical performance.Besides,ND is non-toxic,which makes ND well suit for biomedical applications.ND particle was first produced by detonation technology in 1960s by Russian scientists.From the early of21st century,ND has shown great application in the areas of nanocomposites,biomedicines,polishing grinding and many others fields.Epoxy resins are the widely used thermosetting matrices in polymer composites,structural adhesives,and protective coatings,because of their high mechanical properties,low shrinkage,remarkable chemical/corrosion resistance,and good adhesion.To further improve the performance of epoxy resins for advanced applications,incorporation of various reinforcing particles,either in nano-or microscale,into that resin has been the subject of many research investigations.The toughness and thermal stability of epoxy resin improved after composited with nanodiamond.A study of cure kinetics for nanodiamond/epoxy resin nanocomposites is of great importance not only from the viewpoint of design of the processing operations,but it also can shed light on the microstructure of nanocomposites.The main research is listed as follows:?1?Functionalization of nanodiamond with four kinds of polyurethane chain extendersIn this paper,we reported a facile method to functionalization the surface of ND with four kinds of polyurethane chain extenders.The pristine nanodiamond has been treated by mixture acid,and we protected oxidized nanodiamond?ND-COOH?.The ND-COOH has been treated by SOCl₂,and the acyl chloride group has been grifted on the surface of ND.Then,the functionalized ND particles were grafted with TEOA?MOCA?DAB and HBPA,respectively.The modified NDs exhited good dispersion in THF and chloroform solution.?2?The cure behavior of the prepared composite systems was investigated with dynamic?DSC?technologyA novel epoxy composite with liquid crystalline epoxy resin modified nanodiamond?ND-LCER?was prepared by grafting diglycidyl ether of 4,4?-bisphenol?DGEBP?monomers onto the surface of acid treated nanodiamond?ND-COOH?.Untreated nanodiamond?UND?,ND-COOH and ND-LCER were composited with epoxy/4,4?-diamino diphenyl sulfone?DDS?in various weight ratios,respectively.The cure behavior of the prepared composite systems was investigated with dynamic differential scanning calorimetry?DSC?technology at different heating rates.The two-parameter?m,n?autocatalytic model of Sestak-Berggren based on the Malek method is in-line with the epoxy/ND composites.