Читать книгу Poly(lactic acid) - Группа авторов - Страница 111

The stereoblock (sb) formation allows for the intermolecular and intramolecular mixing of the neighbouring L‐ and D‐stereosequences, thereby leading to the preferential formation of sc crystallites. This is particularly important when synthesizing sc polymers of HMW. Block copolymerization has received enormous recognition in achieving the desired properties of the resulting materials. The composition of PLLA/PDLA, along with the number of blocks and chain length, can be varied to obtain a variety of diblock and multiblock copolymers with tailored properties. The molecular mixing of the enantiomeric PLLA and PDLA chains in the sb copolymers leads to the improved crystallinity [38–40).