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Direct Preparation of Nanoscale Thin Films of Poly(vinylidene fluoride) Containing β ‐Crystalline Phase by Heat‐Controlled Spin Coating
Author(s) -
Ramasundaram Subramaniyan,
Yoon Sun,
Kim Kap Jin,
Lee Jong Soon
Publication year - 2008
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.200800501
Subject(s) - nanoscopic scale , materials science , phase (matter) , spin coating , ferroelectricity , coating , thin film , chemical engineering , fluoride , piezoresponse force microscopy , morphology (biology) , polymer chemistry , nanotechnology , organic chemistry , inorganic chemistry , chemistry , optoelectronics , dielectric , engineering , genetics , biology
Abstract Nanoscale thin films of PVDF containing the β ‐crystalline phase were directly prepared by heat‐controlled spin coating without the influence of external stimuli either in the form of additives or post‐treatments. Sample preparation was carried out at different temperatures, ranging from 10 to 70 °C. At elevated temperatures (40, 50, 60 and 70 °C), PVDF was crystallized into the β ‐phase, while at near‐ambient conditions (20 and 30 °C) it was crystallized into the α ‐phase. Some samples exhibited a phase‐segregated morphology, with varying particle sizes depending on the preparation temperature. The ferroelectric nature of a typical sample, prepared at 40 °C, was visualized by piezoresponse imaging studies.