| 摘要 |
Sulfur-based foams produced by reacting aromatic carbocyclic or heterocyclic compound substituted by -OH, or -NHR groups with molten sulfur to form an aromatic polysulfide, cross-linking the product, generating CO2 or COS in situ before cross-linking is complete, and cooling the foamed product to ambient temperature. In a preferred embodiment the product of the aromatic carbocyclic compound and sulfur is modified with certain carboxy, sulfonic, phosphonic, phosphinic, boronic or borinic acids and cross-linking and CO2 generation is accomplished by addition of a polyisocyanate. Additional sulfur and liquid organic polysulfides may be incorporated in the foams. |
