Xinliang Liu , Menghe Zhu , Jianhao Zhu , Zhihui Liu , Yiwei Geng , Chuanxin Xie , Xilei Chen , Lei Liu , Pingan Song
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引用次数: 0
Abstract
Lightweight and thermally insulating rigid polyurethane foam (RPUF) features various important industrial applications, but intrinsic flammability extremely restricts its practical use. The development of multifunctional coating that combines traditional passive fire retardancy and active fire alarm response has been proven to be a promising method to improve the fire safety of RPUF. Herein, we rationally construct organic-inorganic hybrid coatings with a flame-retardant layer and a temperature-sensitive layer by using poly (vinyl alcohol) (PVA), TiO2, graphite nanoplates (GNs), glass powders (GPs), and copper phytate modified mica (MP) as building blocks. The resultant RPUF achieves a V-0 rating during vertical burning with a limiting oxygen index of up to 31.5 vol.%, in addition to reduced heat and CO yield by 24.0 % and 77.0 %. Moreover, the coated foam shows a rapid fire-alarm response of ∼8 s upon flame attack and displays a good fire cyclic warning performance. Furthermore, the thermal insulation property is well-preserved even when exposed to ∼1100 °C flame due to the good ceramic charring capability. This work provides a promising strategy for the creation of fire-proof coatings for RPUF, which hold great promise for many industrial applications.
期刊介绍：
Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology.
Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal.
However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.
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