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Modification of phenolic foam for insulation of building' s exterior wall
Pages: 50-53
Year: Issue:  2
Journal: China Synthetic Resin and Plastics

Keyword:  phenolic resinfoam materialmodificationheat resistancetoughnessbuilding's exterior wallheat preservation;
Abstract: Phenolic resin was modified by the addition of nano montmorillonite and polyethylene glycol via interlayer polymerization process to improve the heat resistance and toughness of the foam material. The effect of the ratio of phenol to formaldehyde on the microstructure of phenolic foam was studied. The structure of the modified phenolic resin was analyzed by X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). The results show that polyethylene glycol interacts with phenolic resin strongly to form the composite material, which enhances toughness of the modified phenolic resin foam material. Nano montmorillonite improves the heat resistance by increasing the distance between phenolic resin layers and consequently the thermal decomposition temperature reaches 361 ℃. The higher the ratio of phenol to formaldehyde, the lower the reactivity of acid curing reaction and the smaller the cell diameter of the foam formed.
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