Polyamide 6 (PA6) is one of the principal thermoplastics used in the plastics engineering and textile industries. However, PA6 with low limiting oxygen index (LOI) burns easily and its melt drips will lead to spread of flames, which restricts its wider application in several areas. PA6/melamine cyanurate (MCA) composite was prepared via in situ polymerisation. Fourier transform infrared spectroscopy, differential scanning calorimetry and thermogravimetric analysis were used to characterise the chemical structure, thermal transitions and crystallinity and thermogravimetric behaviour of this synthetic flame retardant composite. The results showed that MCA/PA6 had higher crystallisation temperature than PA6 alone; the decomposition rate of MCA/PA6 was obviously lower than that of PA6. The UL-94 flammability test and LOI test revealed that the composite reached a UL-94 V-0 rating at 3?2 mm thickness and had a LOI value of 31?8% at a loading level of 8%MCA.
All-solid-state flexible supercapacitors (FSCs) are promising energy-storage devices in wearable smart electronics. Carbon cloth (CC) has emerged as an ideal candidate as it can fulfill all the required properties for conductive, corrosion-resistant, and lightweight FSC substrates. However, commercial CC is difficult to adhere to without crosslinkers and binders owing to the hydrophobic surface. Herein, oxygen plasma and chemistry methods are selected for hydrophilic modification of commercial CC. Then, Ti 3 C 2 T x flakes are coated on the surface of modified CC as active materials. These modified morphologies were characterized by scanning electron microscope and mechanical properties were investigated by a fabric tensile tester. The electrochemical properties of the MXene-based electrodes by two modification methods were compared. Chemistry modification CC/Ti 3 C 2 T x electrode exhibits an areal capacitance of 513 mF cm −2 , which is 88% higher than that of oxygen plasmamodified CC/MXene electrode, and capacitance retention remains above 92% after 10 000 cycles. This work proposes a feasible strategy, offering a platform for rational designs of flexible electronics based on textiles, as well as employing a large family of MXenes and their heterostructures.
Polyester is widely used in household products because of its good mechanical properties and wears resistance, but polyester is easy to ignite and inclined to produce droplet, so its application range is limited. The cross‐linkable magnesium hydroxide nanoparticles were incorporated into flame‐retardant polyester, which enables the phosphorus‐containing copolyester with thermal cross‐linking and anti‐meltdrop properties. The nanoparticles were achieved by in situ polymerization and acted as a nucleating agent for improving the crystalline properties of the copolyester. Furthermore, the nanoparticles also enhanced anti‐meltdrop properties and reduced the heat and gas release during the combustion process of the copolyester. The maximum heat release rate and total smoke release reduced by 39.8% and 74.4% compared with pure polyester. Specifically, the combustion products of the nanoparticles and phosphorus flame retardant could act a barrier role by covering the carbon layer to isolate air and heat, thereby resulting in excellent anti‐meltdrop properties. The simple modification method reported here realizes the collaborative modification of flame retardant and anti‐meltdrop properties of phosphorous flame‐retardant copolyesters by thermal cross‐linking.
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