Enhanced thermal stability and flame resistance of rigid polyurethane-imide foams by varying copolymer composition
Enhanced thermal stability and flame resistance of rigid polyurethane-imide foams by varying copolymer composition
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DOI：
10.1016/j.polymertesting.2018.02.020
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发表时间：
2018-05-01
期刊：
影响因子：
5.1
通讯作者：
Xiang, Aimin
中科院分区：
文献类型：
--
作者：
Tian, Huafeng;Yao, Yuanyuan;Xiang, Aimin
以多苯基多亚甲基异氰酸酯(PAPI)、均苯四甲酸二酸酐(PMDA)和蓖麻油为原料制备了聚氨基甲酸亚胺(PUI)泡沫塑料。作为一种共聚物，通过改变原料(蓖麻油/PMDA)的比例，可以改变合成材料的聚氨酯/聚酰亚胺链段的比例。因此，聚合物的结构和性能，特别是热稳定性和阻燃性与共聚物的组成有关。随着PMDA含量的增加，泡沫塑料的平均泡孔直径减小，密度和抗压强度增大。另外，随着PMDA值的增加，PUI泡沫塑料的热稳定性和阻燃性能大大提高。与聚氨酯泡沫塑料相比，PUI泡沫塑料的LOI值从17.5%提高到23.8%，且随着PMDA含量的增加，泡沫塑料的降解温度和残炭量增加。因此，通过改变原料配比来控制共聚物链段的组成是可行的，并通过增加聚酰亚胺链段的含量来获得热性能和阻燃性能都得到提高的PUI泡沫塑料。
Polyurethane-imide (PUI) foams were prepared from polyphenyl polymethylene isocyanate (PAPI), pyromellitic dianhydride (PMDA) and castor oil. As a copolymer, the ratio of polyurethane/polyimide segment of the resulting materials was varied by changing the ratio of starting materials (castor oil/PMDA). Thus, the structure and properties, especially thermal stability and flame resistance were regulated in related to the copolymer composition. With the increase of PMDA content, average cellular diameter decreased, while density and compressive strength of PUI foams increased. In addition, the thermal stability and flame retardant of PUI foams greatly improved with the increase of PMDA. The LOI value of PUI foams increased from 17.5 to 23.8 vol % compared with that of polyurethane foam and the degradation temperature as well as carbon residue of PUI foams increased with increase of PMDA content. Therefore, it is viable to control the copolymer segment composition by varying the starting material ratio, and PUI foams with enhanced thermal properties and flame resistance were obtained through enhancing the polyimide segment content.