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Nanostructures of Stereocomplex Polylactide in Poly( l ‐lactide) Doped with Poly( d ‐lactide)
Author(s) -
Huang Wei,
Luo XianZi,
Wang BingJie,
Wei WenFeng,
Chen Peng,
Gu Qun,
de Vos Sicco,
Wang RuYin,
Joziasse Cornelis A. P.
Publication year - 2015
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.201500050
Subject(s) - lactide , extrusion , materials science , coalescence (physics) , melt spinning , polymer chemistry , annealing (glass) , amorphous solid , composite material , chemical engineering , spinning , polymer , copolymer , chemistry , crystallography , physics , astrobiology , engineering
Nanostructures of stereocomplex polylactide ( sc‐ PLA) are obtained and studied in poly( l ‐lactide) (PLLA) doped with a low amount of poly( d ‐lactide) (PDLA) during successive melt‐quenching, extrusion, spinning, and drawing processes corresponding to quiescent, shear flow, elongational flow, and tensioned annealing conditions, respectively. Nanogranules of predominantly sc‐ PLA are initially formed with rapid quenching in quiescent and shear flow, which developed into microspheres with slow quenching and uniform nanofibrils in elongational flow. While only amorphous or the α′ ‐form PLLA is formed with the quenched melts and macroscopic fibers, the embedded nanogranules and nanofibrils are highly crystallized with the coexistence of sc‐ PLA and the α ‐crystals. A 1D coalescence of nascent sc ‐nuclei into nanofibrils in elongational flow is preliminarily proposed to explain the structure evolution and the minor reinforcement of the nanofibrils on the macroscopic fibers.