Search

In the work, new type composites of acrylonitrile butadiene rubber (NBR) and polyurethane-sericite (PU-sericites) hybrid materials was prepared by melt blending method. The PU-sericite hybrid phase was formed via the reaction of NCO groups of NCO terminated PU prepolymer and OH groups of sericites. It was indicated by dynamical mechanical analysis that the damping property of NBR decreases as the amount of PU increases, whereas the mechanical properties at low temperature are enhanced. When PU of 10 wt% was added in, a better damping property can be obtained. The damping property of NBR/PU composites would decrease when adding in sericites, however, the mechanical properties at low temperature would be improved. With PU-sericites hybrid added, the compatibility between sericites and NBR/PU composites would be enhanced and the quasi-interpenetrating polymer network structures would be formed, resulting in a better mechanical property of NBR/(PU-sericites) composites. [ABSTRACT FROM AUTHOR]

In this paper, graphene oxide (GO) was prepared by modified Hammer's method using graphite, which was then modified with silane coupling agent (MGO). With two-roll mill mixing method, GO was used as filler and composites like nitrile-butadiene rubber (NBR)/GO(MGO) composites and nitrile-butadiene rubber (NBR)/ 2,2'-methylenebis(6-tert-butyl-4-methyl-phenol) (AO-2246)/ GO(MGO) composites were prepared. Fourier Transform Infrared Spectrometer (FT-IR), Atomic Force Microscope (AFM) and Scanning Electron Microscope (SEM) were used to observe and study the molecular structure and morphology of GO, MGO and the composites. Dynamic Mechanical Analyzer (DMA) was used to study the damping properties of the composites. The composites reinforced by GO and MGO exhibited better damping and mechanical property. The damping property of NBR/GO composites weakens but the damping property of NBR/AO-2246/GO composites enhances with increase graphene oxide (GO). The damping property of the composites is enhanced by the addition of MGO. The main reason of the excellent properties of the graphene derivatives is its structural characteristics and the associated hydrogen bonds in the structure. [ABSTRACT FROM AUTHOR]

The success of carbon nanotubes (CNTs) as fillers in improving the physicochemical and mechanical properties of polymer is attributed to their unique structure and performance characteristics. The interfacial interaction between fillers and matrix is of significant influence in agglomeration of fillers and mechanical/damping properties of as-prepared composites. Here, polydopamine (PDA), (3-Aminopropyl) triethoxysilane (KH550) and ionic liquid (1-aminoethyl-3methylimidazolium bis ((trifluoromethyl) sulfonyl) imide)) were used to not only functionalize CNTs for suppressing their agglomeration, but also regulate the interfacial interaction between CNTs and carboxylated butadiene nitrile rubber (XNBR) for achieving excellent mechanical properties and better damping properties. The storage modulus of composites rose by 80% (from 1392 to 2488 MPa) with the addition amount of 2.2 wt% CNTs-KH550 and the tensile strength rose by 110% (from 0.32 to 0.68 MPa) with 3.0 wt% CNTs-IL. In addition, the damping degradation of composites caused by the agglomeration of fillers was resolved. The results of molecular dynamics (MD) simulation show that the strong interfacial interaction of CNTs-PDA and CNTs-KH550 is mainly attributed to hydrogen bond interaction, while the interaction of CNTs-IL is determined by hydrogen bond interaction and van der Waals' (vdW) force. The functionalized CNTs with excellent interfacial interaction and dispersion have bright application prospects in the field of composite. Image 1 • Prepared three functionalized CNTs by grafting PDA, KH550 and ionic liquid. • Improved the dispersion of CNTs in XNBR through functionalization. • Enhanced the mechanical properties (80%) of XNBR composite and suppressed the decrease in damping properties. • Analyzed the interfacial interaction between filler and matrix by molecular dynamics simulation on the molecular scale. [ABSTRACT FROM AUTHOR]