Читать книгу Poly(lactic acid) - Группа авторов - Страница 73

Bis‐epoxies have been reported to be useful for chain extending PLA. The epoxy groups can react both with hydroxyl groups and with carboxylic acid groups (Figure 3.6).

However, the latter reaction has been found to be the more rapid one. The opening of the epoxy ring yields a secondary hydroxyl, but this one does not readily react further with remaining epoxy groups [51].

FIGURE 3.6 Chain‐extension reactions of LA‐based prepolymers using bis‐epoxies.