• Reactive functional polymers (Figure 6). Many compatibilizers of this class also contain nonreactive polar groups in addition to reactive groups. Maleic anhydride (MAH, see Figure 7 for an example of how it works) is the most commonly used type of reactive group in such polymers. The second most commonly used type of reactive group is glycidyl methacrylate (GMA, see Figure 8 for an example of how it works) which introduces epoxy functionalities