A novel halogen-free flame retardant poly (vinyl alcohol) foam with intrinsic flame retardant characteristics prepared through continuous extrusion
作者：Dan Guo, Shibing Bai, Qi Wang
關鍵字：Halogen-free flame retardant PVA foam, Intrinsic flame retardant. Extrusion foaming
論文來源：期刊
具體來源：http://cel.sagepub.com/content/early/2014/04/06/0021955X14529296.abstract
發表時間：2014年
This
paper reported a novel halogen-free flame retardant poly
(vinyl alcohol) (PVA) foam with
intrinsic flame retardant characteristics
prepared through continuous extrusion using water as blowing agent. The
morphology, cellular structure, mechanical properties and flame retardancy of
the foams were systematically investigated. The experiments showed that PVA was
not only the flame retardant target foam matrix, but also played an important role
in char forming reactions, water not only acted as plasticizer and blowing
agent for PVA thermal foaming, but also an effective synergistic flame
retardant by evaporation to cool the system and suppress the point of
inflammability, and melamine phosphate (MP) as halogen-free flame retardant was
well dispersed in PVA matrix due to the strong interaction between MP and PVA,
and also acted as excellent heterogeneous nucleating agent for foaming. The
prepared halogen-free flame retardant PVA foam had good cellular structure, excellent
flame retardancy and mechanical properties, i.e. apparent density 0.25 g/cm3,
average cell diameter 450 μm, cell density 103 cells/cm3,
reaching UL94 V-0, LOI 35%, tensile strength 1.8 MPa and elongation at break
57.1%. Which can be regarded as a novel polymer foam with intrinsic flame
retardant characteristics: PVA acts as foam matrix and macromolecular carbon source,
MP acts as flame retardants and nucleation agent, and the bound water in PVA
acts as plasticizer, blowing agent, and synergistic flame retardants. The novel
halogen-free flame retardant PVA foam has potential applications.