Polymorphism and ring-banded spherulites in poly(butylene adipate) (PBA) diluted with poly(vinyl acetate) (PVAc) or poly(hydroxyether of bisphenol A) (phenoxy) were studied. For neat PBA, polymorphism and ring-banded spherulites occur at overlapped T c = 28-31 °C (4 °C range). By comparison, ring bands of crystallized PBA/PVAc blend remain similar to neat PBA; while for PBA/phenoxy blend, ring bands are completely disrupted (revealed by surface AFM phase images), owing to strong interchain interactions between PBA and phenoxy. The results summarily demonstrate that the T c range for polymorphism becomes much wider (T c = 19-32 °C) with the addition of the amorphous polymers and reveals the phenomenon of ring bands in PBA is not correlated or attributed to its α+β polymorphism. Via incorporation of two different types of amorphous polymer, PVAc or phenoxy, into PBA to form blends to reveal, respectively, the varying T c windows of presence of ring-banded spherulites and polymorphism in PBA or its blends. The results summarily conclude that ring bands in PBA cannot be attributed to its α+β polymorphism.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry