Development of polyamide12 composite foam by supercritical CO2: The effect of flame retardants on foaming behavior and properties

Lightweight and flame retardant fluorosilicone rubber composited foam prepared by supercritical nitrogen

“…On the one hand, the larger the number of fillers, the more likely it was to build a 3D packing skeleton and therefore the viscosity of the polymer matrix increased, 20 which gradually increased the resistance to cell growth. On the other hand, flame retardants acted as nucleation points for heterogeneous nucleation, increasing the number of nucleation points in the material, reducing the size and increasing the number of cells formed 20,21 . However, when the content of flame retardants was too high (e.g., reached 30 phr), the distance between the flame retardants decreased, resulting in agglomeration, further reduced foaming performance 22 …”

“…On the other hand, flame retardants acted as nucleation points for heterogeneous nucleation, increasing the number of nucleation points in the material, reducing the size and increasing the number of cells formed. 20,21 However, when the content of flame retardants was too high (e.g., reached 30 phr), the distance between the flame retardants decreased, resulting in agglomeration, further reduced foaming performance. 22 Therefore, considering the requirements of lightweight, the content of flame retardants should not exceed 30 phr.…”