Enhancing the flame retardancy and UV resistance of polyamide 6 by introducing ternary supramolecular aggregates
writer：Yuchun Li， Jinzhao Wang，Boqiong Xue，Shuheng Wang，Peng Qi，Jun Sun，Hongfei Li，Xiaoyu Gu，Sheng Zhang
keywords：碳納米管負(fù)載超分子聚集體用于提升PA6的阻燃與抗光氧老化性能
source：期刊
specific source：Chemosphere
Issue time：2021年
An integrated multi-functional additive was fabricated by successively grafting melamine (MEL) and phytic acid (PhA) on multiwalled carbon-nanotubes (MWNCTs), and was then applied in PA6 to improve the flame retardancy and light aging resistance of the composite. The limit oxygen index of PA6 composite containing 7 wt% PhA-MEL-MWCNTs was increased to 26.4 from 21.0. The smoke and CO release were significantly reduced by 48% and 88% respectively, and the severe melt dripping of PA6 in burning was eliminated. It is proved that PhA-MEL-MWCNTs can absorb ultraviolet (UV) radiation, and hence significantly reduces the mechanical property loss of the PA6 composite after UV aging. The tensile strength of the aged PA6/7 wt%PhA-MEL-MWCNTs composite sample only decreased by 18.1%, which was significantly lower than the loss rate of the control aged PA6 sample (62.5%). This protocol provides a new opportunity for fabricating long-life flame retardant polyamide composites.
通過(guò)在多壁碳納米管（MWNCTs）上依次接枝三聚氰胺（MEL）和植酸（PhA）制備了一種集成的多功能添加劑，然后將其應(yīng)用于PA6以提高復(fù)合材料的阻燃性和耐光老化性。含有 7 wt% PhA-MEL-MWCNTs 的 PA6 復(fù)合材料的極限氧指數(shù)從 21.0 增加到 26.4。煙氣和CO釋放量分別顯著降低48%和88%，消除了PA6燃燒過(guò)程中嚴(yán)重的熔滴現(xiàn)象。證明PhA-MEL-MWCNTs可以吸收紫外線（UV）輻射，從而顯著降低UV老化后PA6復(fù)合材料的機(jī)械性能損失。老化后的 PA6/7 wt% PhA-MEL-MWCNTs 復(fù)合樣品的拉伸強(qiáng)度僅降低了 18.1%，顯著低于對(duì)照老化 PA6 樣品的損失率 (62.5%)。該協(xié)議為制造長(zhǎng)壽命阻燃聚酰胺復(fù)合材料提供了新的機(jī)會(huì)。
https://doi.org/10.1016/j.chemosphere.2021.132100