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Oppositely Synchronized Lamellar Bending in Poly( l ‐lactic acid) Versus Poly( d ‐lactic acid) Blended with Poly(1,4‐butylene adipate)
Author(s) -
Nurkhamidah Siti,
Woo Eamor M.
Publication year - 2014
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.201300767
Subject(s) - adipate , lamellar structure , chirality (physics) , materials science , lactic acid , polymer chemistry , polymer , crystallography , chemical engineering , chemistry , composite material , bacteria , chiral symmetry breaking , physics , quantum mechanics , biology , nambu–jona lasinio model , engineering , genetics , quark
Lamellar bending habits, as influenced by molecular‐chain chirality, in packing into dendritic spherulites with specific optical patterns are discussed using two model polymers of opposite chirality that are blended with a common polymer as examples: i) poly( l ‐lactic acid)/poly(butylene adipate) (PLLA/PBA) and ii) poly( d ‐lactic acid)/PBA (PDLA/PBA) blends. The bending habits in the spherulites of PLLA or PDLA blended with PBA are dictated by the chirality, specifically the counterclockwise and clockwise directions for the PLLA/PBA (50:50) and PDLA/PBA (50:50) blends, respectively. Straight lamellae in spiral lozenge crystals are packed with crystal aggregates of PLLA on top of the flat‐on lamellae plates acting as a basal plane during crystallization at T c ; spiral lozenge‐crystal frameworks are surrounded by needle‐like crystals resembling PBA crystals.