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Crystal Polymorphism and Spherulites in Poly(butylene adipate) Diluted with Strongly Versus Weakly Interacting Amorphous Polymers
Author(s) -
Lugito Graecia,
Woo Eamor M.
Publication year - 2012
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201200299
Subject(s) - adipate , amorphous solid , polymorphism (computer science) , polymer , polymer chemistry , materials science , crystal (programming language) , tacticity , chemical engineering , crystallography , chemistry , composite material , polymerization , biochemistry , genotype , gene , computer science , programming language , engineering
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.