合并了与植物酸修饰的UiO-66-NH2的奇托冷凝,以提高阻燃性能
Chenfei Wang1, Bing Yu1, Tong Zhao1
1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu provincial key lab for the chemistry and utilization of agroforest biomass, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Carbohydrate polymers
|February 6, 2025
概括
新的阻燃复合制冷凝是使用素和酸修饰的Zr基金属有机框架 (PA-UiO-66-NH2) 开发的. 这些材料具有出色的阻燃性和绝热性,为储能和建筑绝热提供可持续的替代方案.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 纳米技术纳米技术
背景情况:
- 酸盐 (CS) 是一种多功能生物聚合物,在先进材料中具有潜在的应用.
- 开发有效的阻燃材料对于储能和建筑绝缘的安全至关重要.
- 金属有机框架 (MOF) 为材料增强提供可调节的特性.
研究的目的:
- 为了合成新的阻燃复合材料冷凝,使用素作为骨架.
- 通过结合植物酸修饰的Zr基金属有机框架 (PA-UiO-66-NH2) 来增强奇托冷凝的阻燃性能.
- 评估已开发的复合制冷凝的隔热和疏水性能.
主要方法:
- 合成基托 (CS) 基复合制冷凝.
- 用 phytic 酸 (PA) 修改基于 Zr 的金属有机框架 (UiO-66-NH2).
- 将PA-UiO-66-NH2集成到CS网络中.
- 使用垂直燃烧试验 (UL-94),限制氧指数 (LOI),圆热量计和水接触角测量进行表征.
- 使用甲基三西兰 (MTCS) 进行疏水修饰.
主要成果:
- 复合型冷凝获得了V-0的UL-94评级和39%的LOI,其中15%的PA-UiO-66-NH2添加.
- 圆热量计显示,热量释放和烟雾产生减少,形成一个紧的碳层.
- 与原始冷凝相比,经过修改的冷凝具有更高的绝热性能 (0.03447 W/(m·K)).
- 疏水性修饰导致水接触角度为135.3° ± 2.3°.
结论:
- 开发的基托桑基复合型冷凝显示出出色的阻燃性和绝热性能.
- 添加PA-UiO-66-NH2显著提高了基托冷凝的阻燃性能.
- 这些材料在储能和建筑绝缘应用中显示出对传统石油产品的可持续替代品的前景.
相关概念视频
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
01:09Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction
Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps.