4.7 Article

Interfacial flame retardance of Poly(vinyl alcohol) bead foams through surface plasticizing and microwave selective sintering

期刊

APPLIED SURFACE SCIENCE
卷 551, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apsusc.2021.149416

关键词

Interfacial flame-retardant mode; Surface plasticizing; Microwave selective sintering; Poly(vinyl alcohol); Potassium silicate; Mechanical properties

资金

  1. National Natural Science Foundation of China [51720105012]
  2. Major Science and Technology Projects in Sichuan Province [2019ZDZX0018]

向作者/读者索取更多资源

A novel interfacial flame-retardant mode based on surface plasticizing and microwave selective sintering was proposed to reduce the flammability and enhance mechanical properties of PVA/KSi foam beads. The foam reached UL-94 V-0 level and had a LOI value of 33.7%, showing great potential for applications in various fields.
Due to the presence of massive air and porous structure, the high flammability of polymeric foams severely limits their wider application in household, automobile, and aerospace fields. Herein, an interfacial flame-retardant mode based on surface plasticizing and microwave selective sintering was proposed to simultaneously realize the significantly reduced flammability and the enhanced mechanical properties of poly (vinyl alcohol) (PVA)/potassium silicate (KSi) bead foams. First, the foamed PVA beads with unique cell structure were prepared by supercritical carbon dioxide extrusion foaming and pelletizing. Then the KSi aqueous solution was coated on the surfaces of as-prepared PVA beads through surface plasticizing and acted as the excellent microwave absorber. Upon exposure to microwave irradiation, the interfacial heating caused by KSi coating layer induced the surface melting and cohesion of the neighboring PVA beads. The intense molecular diffusion occurred between PVA and KSi in the interfacial regions, improving the mechanical properties of foam parts. Meanwhile, KSi enriched at the bead interface and quickly decomposed into silicon-containing compounds once ignition, which constituted a dense physical Si and C barrier preventing the propagation of combustible substance and oxygen. Thus, the PVA/KSi bead foam reached the UL-94 level of V-0 and LOI value as high as 33.7%.

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