封装水赋予交叉链接的聚烯泡前所未有的阻燃性
Chi Zhang1, Pei Wang1, Zhouyu Chen1
1Institute of New Concept Sensors and Molecular Materials, Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China.
ACS applied materials & interfaces
|February 3, 2025
概括
研究人员开发了含有水的交联聚烯泡 (cPSs),以提高阻燃性. 这些新型材料达到V-0等级,显著减少热释放,增加点火时间,提高消防安全.
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:
- 由于其高热量和蒸发能力,水是一种有效的阻燃剂.
- 将水整合到材料中,同时确保其保留,对阻燃剂应用提出了重大挑战.
研究的目的:
- 通过将水融入交联聚烯泡 (cPSs) 中,开发一种新型阻燃材料.
- 评估这些含水复合泡的阻燃性能和长期稳定性.
主要方法:
- 开发交联聚烯泡 (cPSs),用水封装在封闭的孔隙中.
- 使用UL-94测试对阻燃性进行评估,并测量关键参数,如峰值热释放率 (PHRR),总热释放率 (THR),点火时间 (TTI) 和火焰性能指数 (FPI).
- 加入阻燃涂层和盐来延迟水蒸发并提高材料的耐用性.
主要成果:
- 在UL-94测试中,复合cPS在水体积分数超过33%的情况下达到V-0以上的阻燃度.
- 一个代表性的复合物 (cPSs-M2) 显示PHRR减少了55.4%,THR减少了31.1%.
- TTI和FPI分别提高了10倍和25倍以上.
- 阻燃涂层和盐的加入显著延迟了水蒸发,预计使用寿命超过8年.
结论:
- 在封闭的孔中含有水的交联聚烯泡具有出色的阻燃性能.
- 与传统材料相比,开发的复合材料表现出优越的消防安全性能.
- 加入具有延迟蒸发机制的水的策略提供了持久有效的阻燃溶液.
相关概念视频
01:14Polymer Classification: Architecture
2.6K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.6K
01:22Thermal Insulation in Masonry Walls
104
In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
104
01:08Molecular Weight of Step-Growth Polymers
2.1K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.1K
02:35Free-Radical Chain Reaction and Polymerization of Alkenes
7.7K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.7K
01:31Plasticizers
65
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
65
01:20Anionic Chain-Growth Polymerization: Overview
2.0K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.0K