Stable and well dispersed nickel nanoparticles (NiNPs) were fabricated and embedded in a novel polymer sulfonate and benzimidazole functionalized poly (arylene ether ketone) (S‐BI‐PAEK) film. After drop‐casting the mixed solution of S‐BI‐PAEK and NiSO4 on glassy carbon electrode (GCE) surface, the uniformly distributed NiNPs were formed and stably embedded in S‐BI‐PAEK film by in‐situ electrochemical reduction method. The embedment and well dispersity of NiNPs in S‐BI‐PAEK film was probably attributed to the strong chelation of sulfonate and benzimidazole functional groups contained in S‐BI‐PAEK toward Ni2+ ions, as well as the transferability of Ni2+ ions in S‐BI‐PAEK film. The NiNPs/S‐BI‐PAEK composite film was characterized by scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDS), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). It exhibited good electrocatalytic activity toward glucose oxidation in 0.1 mol L−1 NaOH solution with high stability. The NiNPs/S‐BI‐PAEK/GCE showed a fast amperometric response with a wide linear range from 1 μM to 4 mM and a low detection limit of 200 nmol L−1 (S/N=3) for the determination of glucose by amperometry at a potential of 0.55 V. Finally it was successfully employed to determine glucose in human serum. Therefore, the novel fabrication method of nickel nanoparticles was promising for the future development of non‐enzymatic glucose sensor. 相似文献
New poly(aryl ether ketone)s (PAEKs) with a low melting temperature (relative to PEEK) are of interest in order to simplify the manufacturing of high-performance polymers or composites. In this study, we propose to investigate the physical properties of a new PAEK from Victrex, namely PAEK LM. Combinations of thermal analyses were used as follows: standard and modulated temperature differential scanning calorimetry, dynamic mechanical analysis, dynamic dielectric analysis and guarded hot plate technique. We found that the global mechanical, dielectric and thermal properties are very similar to the PEEK reference. The glass transition temperature was observed in the same range than PEEK (∼ 150 °C) while the melting temperature Tm was measured at 307 °C for PAEK LM which is about 35 °C below the melting temperature of PEEK. The degree of crystallinity of PAEK LM was found to be 27% while for PEEK it is 38%, depending on the processing conditions. This work explored crystalline structure–property relationships to explain the behaviour of PAEK LM.
A phosphrous-containing poly(aryl ether ketone)was synthesized derived from bisphenol-A and bis[4-(4- fluorobenzoyl)phenyl] phenyl phosphine oxide(FPPPO)by nucleophilic substitution reaction.The structure of the polymer was characterized by FT-IR,~1H-NMR and ~(31)p-NMR.The thermal property of the PAEK was measured by DSC and TGA. The glass transition temperature(T_g)of the polymer was 205℃,and the 5% weight loss temperature under nitrogen was 475℃.Good solubility of the polymer in organic solvents,such as N-methylpyrrolidone,dimethylformamide, dimethylacetamide,dimethylsulfoxide and chloroalkanes was observed,flexible film was obtained from the polymer's CH_2Cl_2 solution.The limiting oxygen index(LOI)of the PAEK was 40,which indicated that organic phosphorus moiety can offer good flame retardant property to the polymer. 相似文献
The plastic deformation of glassy non-annealed polyaryleneetherketone (PAEK) was investigated via deformation calorimetry and thermally stimulated recovery of residual strain. Polymer samples were deformed at room temperature under uniaxial compression up to εdef =–(40?50)% at a rate of 0.04 min?1. It was found that PAEK behaves in the deformation process similarly to many other glassy polymers: It stores internal energy excess at loading and contains two types of different inelastic strain carriers, namely the delayed elastic (εde) and plastic (εpl) strain carriers. The maximum level of the accumulated energy in PAEK reaches ≈ 8.3 J/g, which is close to those for glassy polystyrene and polycarbonate. Nearly all the deformation energy stored in PAEK is carried by the delayed-elastic strain. The carriers of plastic strain carry no extra energy or a very small amount of it. The inelastic deformation of glassy PAEK proceeds in two stages. The carriers of εde are nucleated at the first stage of the deformation process, and the carriers of εpl are nucleated at the second stage. It was shown that, during glassy-polymer loading, the molecular level structures carrying εpl never appear by themselves, but appear only as a result of spontaneous reorganization of εde. In other words, the plastic deformation appears in PAEK owing to the two-step process. This situation is typical for all glassy polymers. 相似文献
Summary: The ring‐banded spherulites in liquid crystalline poly(aryl ether ketone) (LC‐PAEK) and poly(aryl ether ether ketone) (PEEK) blends with a higher content (>50%) of LC‐PAEK are investigated by polarizing light microscopy (PLM) and atomic force microscopy (AFM) techniques. The results indicate that the light core and rings of the ring‐banded spherulites under PLM are mainly composed of an LC‐PAEK phase, while the dark rings consist of coexisting phases of PEEK and a small amount of LC‐PAEK. The formation of the ring‐banded spherulites is attributable to structural discontinuity caused by a rhythmic radial growth.