Studies on intumescent flame retardant polypropylene composites based on biodegradable wheat straw

Abstract

Summary Wheat straw (WS) has numerous advantages compared with traditional bioadditives such as starch and lignin. So in this work, based on WS and silica microencapsulated ammonium polyphosphate, flame retardant polypropylene/wheat straw (WSP) composites were prepared by melted blend method. Flame retardant and thermal properties of WSP composites have been investigated. The results of cone calorimeter show that peaks of heat release rate and total heat release of the flame retardant WSP composite decrease substantially compared with those of pure polypropylene. The peak of heat release rate value of the flame retardant WSP composite decreases from 1290.5 to 247.9 kW/m2, and the total heat release value decreases from 119.4 to 46.3 MJ/m2. Meanwhile, thermal degradation and gas products of the flame retardant WSP composite were monitored by thermogravimetric analysis and thermogravimetric analysis‐infrared spectrometry. The result of thermal analysis shows that the flame retardant WSP composite has a high thermal stability and has a 30.0 wt% residual char at 600°C. From this work, we hope to provide a method to prepare flame retardant polymer composites with a biodegradable natural material‐WS.

Influence of expandable graphite on flame retardancy and thermal stability property of unsaturated polyester resins/organic magnesium hydroxide composites

“…Smoke production rate (SPR) was another important parameter for evaluating the combustion behavior of materials. Moreover, it was essential to let down the smoke release during the combustion of polyester, because smoke was one of the injured reasons in fire accidents . As shown in Figure (c), the addition of OMH effectively reduced SPR release than pure UPR sample.…”

Effect of benzophenone on the physicochemical properties of N-CNTs synthesized from 1-ferrocenylmethyl (2-methylimidazole) catalyst

“…Peaks at around 2927 and 2625 cm −1 are assigned to the O-H and CH 3 stretching vibrations [61], respectively. The prominent band at 2381 cm −1 is assigned to the characteristic absorbance of CO 2 groups [62], while peaks at 1763, 1567 and 1030 cm −1 are assigned to stretching vibrations of C=O, C=N and C-O functional groups, respectively [63]. The peaks at 1375 cm −1 are assigned to stretching vibrations of C-NH 3 [64].…”

Advanced development of dairy farm waste-based biocarbon-reinforced unsymmetrical structured bio-phenolic polybenzoxazine composites

“…12 The biocomposite materials are those wherein at least one of the components like matrix, reinforcements, fillers and so on, in the composite must be bioresource materials (or) renewable materials. In this context, sugarcane, chicken eggshell, 13 wheat straw, 14 crab shell 15 and so on, were used as fillers for the development of bio-based polymer composites. Such reinforcements improve the stiffness and strength of the polymer matrix.…”