What are the main types of compatibilizers on the market? How do we select the appropriate type for our specific material system (such as PA/PP)?

Compatibilizers are mainly divided into two categories, and the choice depends on your material system and modification goals:

Reactive Compatibilizers: The most common type, these have active groups on their molecular chains (such as maleic anhydride, epoxy, carboxyl, amino, etc.) that can undergo chemical reactions with specific functional groups in the blended materials (e.g., the terminal amino groups in PA), forming strong chemical bonds. For example, maleic anhydride-grafted polypropylene (PP-g-MAH) is a classic choice for PA/PP alloys.

Non-Reactive Compatibilizers: Typically block or graft copolymers, these rely on the physical compatibility and entanglement of their different chain segments with the blended components to improve the interface. They are suitable for systems where the molecular structures have some similarity or where chemical reactions are less likely to occur.

Selection Advice: First, analyze the chemical properties of each component in your blending system. If one of the components contains reactive groups (such as the amino groups in nylon or the carboxyl or hydroxyl groups in polyester), prioritize the use of reactive compatibilizers with complementary active groups, as their compatibilizing effects are generally more significant and stable.