Study on the flame retardancy and high toughness of POE system by DOPA grafted brucite powder

Research on achieving simultaneous flame retardancy and high toughness in POE (polyolefin elastomer) system by grafting brucite powder with DOPA (dopamine). The interfacial compatibility between brucite powder and POE matrix was enhanced by chemical grafting modification, thereby improving the comprehensive performance of the composite material. This study explored the preparation method of grafted modified brucite powder, the properties of the composite material, and the effect of grafting modification on flame retardancy and toughness.

Polyolefin elastomer (POE) is widely used in many fields due to its excellent elasticity and processing properties. However, the flame retardant properties of POE itself are poor, which limits its application in some occasions with high fire protection requirements. As an inorganic flame retardant, brucite powder can improve its compatibility with the polymer matrix through surface modification, thereby improving the flame retardant and mechanical properties of the composite material.

Grafting modification method

DOPA grafting: Dopamine (DOPA) is grafted onto the surface of brucite powder by utilizing its self-polymerization characteristics to enhance the interfacial compatibility between brucite powder and POE matrix.

Grafting conditions: Control the reaction temperature, time and DOPA concentration to achieve the best grafting effect.

Composite material preparation

Raw materials: polyolefin elastomer (POE), grafted modified brucite powder.

Preparation method: Grafted modified brucite powder was added to POE by melt blending to prepare flame-retardant modified POE composite materials.

Performance evaluation

Flame retardant performance: The flame retardant properties of the composite materials were evaluated by oxygen index method (LOI) and vertical combustion method (UL-94).

Mechanical properties: The tensile strength, elongation at break and other mechanical properties of the composite materials were measured to evaluate the effect of grafting modification on the toughness of the composite materials.

Interface compatibility: The cross-sectional morphology of the composite materials was observed by scanning electron microscopy (SEM) to evaluate the interface compatibility between brucite powder and POE matrix.

Results and discussion

Flame retardant performance: Grafted modified brucite powder can effectively improve the flame retardant properties of POE composite materials, and the oxygen index is significantly improved.

Toughness: Grafting modification enhances the interfacial compatibility between brucite powder and POE matrix, so that the toughness of the composite material is significantly improved while maintaining good flame retardant properties.

Interface compatibility: SEM observation shows that the grafted brucite powder forms a good interface bond with the POE matrix, reducing interface defects.

Brucite powder grafted with DOPA can effectively improve the flame retardant properties and toughness of POE composites. This modification method provides a new way to develop high-performance flame-retardant POE composites.