相关实验视频
Updated: Jul 26, 2025

07:21
Twin-Screw Extrusion Process to Produce Renewable Fiberboards
Published on: January 27, 2021
6.5K
一种基于DOPO的高效阻燃剂作为辅固剂,同时提高环氧树脂的消防安全性和机械性能
Mingyu Ou1, Richeng Lian1, Rongjia Li1
1College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, Shandong, 266042, P. R. China.
Macromolecular rapid communications
|June 19, 2023
概括
一种基于素的新型阻燃剂 (FNP) 显著提高了环氧树脂 (EP) 的消防安全性和机械强度. 经FNP修改的EP获得V-0评级和增强的柔性特性,为先进材料提供了有前途的解决方案.
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
- 消防安全工程 消防安全工程
背景情况:
- 同时提高环氧树脂 (EP) 的消防安全性和机械性质是材料开发中的一个重大挑战.
- 现有的阻燃剂往往会损害EP复合材料的机械性能.
研究的目的:
- 为环氧树脂合成一种基于基的新型阻燃剂 (FNP).
- 评估用FNP修改的EP复合材料的消防安全和机械性能.
- 调查改善消防安全背后的机制.
主要方法:
- 合成FNP使用3,5-胺-1,2,4-三,4-甲基酸和9,10-二-9-氧-10-芬-10-氧化物.
- 使用FNP作为共同固化剂来制造EP复合材料.
- 使用UL-94垂直燃烧测试和限制氧指数 (LOI) 评估消防安全.
- 测量热释放率,烟雾释放,屈曲强度,模量和玻璃过渡温度.
主要成果:
- 含有8%重量FNP (EP/8FNP) 的EP复合材料获得了UL-94 V-0评级和31%的LOI.
- 与纯EP相比,EP/8FNP的峰值热释放率 (41.1%),总热释放率 (31.8%) 和总烟雾释放率 (16.0%) 降低了.
- EP/8FNP的屈曲强度增加了20.3%,屈曲模量增加了5.4%.
- EP/8FNP的玻璃化过渡温度从纯EP的141.6°C上升到147.3°C.
结论:
- 合成的FNP有效地提高了EP复合材料的消防安全性,通过促进煤炭形成和释放阻燃气体.
- FNP充当配固剂,改善机械性能,如屈曲强度和模量.
- 这项研究为开发高性能,防火环氧树脂材料提供了可行的途径.
相关概念视频
Fiber Reinforced Concrete
108
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
108
Retarders
88
Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
The function of retarders is to delay the setting of concrete, and this effect can be measured using a penetration test. The retardation process involves adding...
88
Superplasticizers
106
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
106
Flame Photometry: Lab
282
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
282
Flame Photometry: Overview
674
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
674
Types of Step-Growth Polymers: Polyesters
2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K

