State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China.
Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, China.
Chemosphere. 2022 Jan;287(Pt 2):132100. doi: 10.1016/j.chemosphere.2021.132100. Epub 2021 Sep 1.
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.
一种集成多功能添加剂通过依次在多壁碳纳米管（MWCNT）上接枝三聚氰胺（MEL）和植酸（PhA）而制备，并将其应用于 PA6 中，以提高复合材料的阻燃性和耐光老化性。含有 7wt%PhA-MEL-MWCNT 的 PA6 复合材料的极限氧指数从 21.0 增加到 26.4。烟雾和 CO 的释放量分别显著降低了 48%和 88%，并且消除了 PA6 在燃烧时的严重熔体滴落。证明 PhA-MEL-MWCNTs 可以吸收紫外线（UV）辐射，因此显著降低了 PA6 复合材料在 UV 老化后的力学性能损失。老化后 PA6/7wt%PhA-MEL-MWCNTs 复合材料样品的拉伸强度仅下降了 18.1%，明显低于对照老化 PA6 样品的损失率（62.5%）。该方案为制备长寿命阻燃聚酰胺复合材料提供了新的机会。
