Flame retardation of banana fiber reinforced epoxy composites using melamine pyrophosphate and pentaerythritol as intumescent flame retardants and the influence of mechanical properties were investigated. The effects of IFR contents and the ratio of MPP and PER on limiting oxygen index (LOI) and UL94 rating of banana fiber reinforced epoxy composites has been studied. It was found that the combustion performance of the composites increases with increasing IFR contents,and the composites at the ratio of MPP/PER=2:1(weight ratio) at the same loading 40% showed the best combustion performance with IFR contents increasing,the limiting oxygen index (LOI) increased and UL94 rating reached, but the mechanical properties of composites significantly decreased. In order to increase the comprehensive properties, the flame retarded fiber was used to prepared the composites,the limiting oxygen index (LOI) of the composites significantly increased. the best complex properties were the IFR contents was 40%, the ratio of MPP/PER=2:1 (weight ratio), by the spraying method with 20g the fire retardant liquid of every 30g banana fiber.
A simple method for fabricating silver circuit patterns on polyimide (PI) substrate was developed. Firstly, partially potassium hydroxide (KOH) modified pattern was produced on the surface of PI film via a screen printing process. Then the silver ions were doped into the interior of the PI substrate through an ion-exchange reaction. Finally, the silver circuit patterns with the lines of 200 µm width were formed on the PI substrate surface due to the reduction reaction of dimethylamine borane (DMAB). Scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, infrared spectra (FT-IR) and contact angles analyses were conducted to study the morphology, composition and structure of the obtained silver patterns on the PI substrate. This approach is simple and versatile, and need not the expensive apparatus, which is a promising candidate for a broad range of application in high-density circuitry electronic industry.
Linear low-density polyethylene (LLDPE)/nano-montmorillonite (nano-MMT) composites were prepared by melting method. Mechanical test, scanning electron microscope (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and small angle light scattering (SALS) measurements were used to characterize the mechanical properties and structure of the LLDPE composite. The results indicated that the impact strength of LLDPE decreased with the increase of nano-MMT content. However, the tensile strength firstly increased and then decreased. The aggregation of nano-MMT in LLDPE happened at larger content. The spherulite size and crystallinity of LLDPE reduced with the addition of nano-MMT. Furthermore, it was found that the structure of the spherulite was destroyed by the nano-MMT. The microcrystal size of LLDPE also decreased with the increase of nano-MMT content.
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