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Formation of Polyamide Nanofibers by Directional Crystallization in Aqueous Solution
Author(s) -
Demirel A. Levent,
Meyer Matthias,
Schlaad Helmut
Publication year - 2007
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200703486
Subject(s) - crystallization , aqueous solution , materials science , chemical engineering , nanofiber , annealing (glass) , polymer , polymer chemistry , composite material , chemistry , organic chemistry , engineering
Great balls of fiber! Annealing of a dilute aqueous solution of poly(2‐isopropyl‐2‐oxazoline) above its cloud point leads to the formation of a coagulate in the form of crystalline nanofibers (see microscopy image). Directional crystallization, which occurs below the glass transition temperature of the polymer at 65 °C, is driven by hydrophobic and dipolar interactions in combination with a solvation effect.