TY - JOUR
T1 - Stable blue phase polymeric Langmuir-Schaefer films based on unsymmetrical hydroxyalkadiynyl N-arylcarbamate derivatives
AU - Alekseev, Alexander
AU - Ihalainen, Petri
AU - Ivanov, Artem
AU - Domnin, Ivan
AU - Rosqvist, Emil
AU - Lemmetyinen, Helge
AU - Vuorimaa-Laukkanen, Elina
AU - Peltonen, Jouko
AU - Vyaz'min, Sergey
PY - 2017
Y1 - 2017
N2 - Unsymmetrical diynes containing N-arylcarbamate groups in the hydrophobic part and hydroxymethylene groups in the hydrophilic part of the molecules were synthesized and studied. The Langmuir monolayer formation process was followed by Brewster angle microscopy (BAM). The Langmuir-Schaefer monolayer films, transferred on solid substrates (quartz or Si), were investigated by absorption spectroscopy and atomic force microscopy (AFM). Four substances had 2 methylene groups in the hydrophilic part of the molecule (n) and 4 or 5 of these groups in the hydrophobic part (m). At the same time the aryl substituent had a hydrogen atom or a MeO group in the p-position of the benzene ring. After 20 min of UV irradiation the initially colorless monomeric films of all four compounds turned into stable blue phase polymeric films. The blue phase is unusual for alcoholic diacetylene derivatives. The BAM and AFM measurements demonstrated higher homogeneity of the films with a MeO group in the aryl substituent in comparison to the molecules with a hydrogen atom. The reasons for these different structural organizations as well as potential applications of stable blue phase polydiacetylene thin films are discussed.
AB - Unsymmetrical diynes containing N-arylcarbamate groups in the hydrophobic part and hydroxymethylene groups in the hydrophilic part of the molecules were synthesized and studied. The Langmuir monolayer formation process was followed by Brewster angle microscopy (BAM). The Langmuir-Schaefer monolayer films, transferred on solid substrates (quartz or Si), were investigated by absorption spectroscopy and atomic force microscopy (AFM). Four substances had 2 methylene groups in the hydrophilic part of the molecule (n) and 4 or 5 of these groups in the hydrophobic part (m). At the same time the aryl substituent had a hydrogen atom or a MeO group in the p-position of the benzene ring. After 20 min of UV irradiation the initially colorless monomeric films of all four compounds turned into stable blue phase polymeric films. The blue phase is unusual for alcoholic diacetylene derivatives. The BAM and AFM measurements demonstrated higher homogeneity of the films with a MeO group in the aryl substituent in comparison to the molecules with a hydrogen atom. The reasons for these different structural organizations as well as potential applications of stable blue phase polydiacetylene thin films are discussed.
KW - Chemistry and Materials Science
KW - ABSORPTION SPECTROSCOPY
KW - Langmuir-Schaefer Film
KW - Photopolymerization
KW - Blue phase polydiacetylenes
KW - Brewster angle microscopy
KW - Chemistry and Materials Science
KW - ABSORPTION SPECTROSCOPY
KW - Langmuir-Schaefer Film
KW - Photopolymerization
KW - Blue phase polydiacetylenes
KW - Brewster angle microscopy
KW - Chemistry and Materials Science
KW - ABSORPTION SPECTROSCOPY
KW - Langmuir-Schaefer Film
KW - Photopolymerization
KW - Blue phase polydiacetylenes
KW - Brewster angle microscopy
M3 - Artikel
SN - 0040-6090
VL - 645
SP - 108
EP - 118
JO - Thin Solid Films
JF - Thin Solid Films
ER -