TY - JOUR
T1 - Preparation of liquid-crystal thermosets
T2 - in situ photopolymerization of oriented liquid-crystal diacrylates
AU - Hsu, Chain-Shu
AU - Chen, Hwai Len
PY - 1999/11/1
Y1 - 1999/11/1
N2 - The photoinitiated polymerization of 2-chloro-1,4-phenylene bis[4-[6-(acryloyloxy)hexyloxy]benzoate] (1M) was studied. The monomer 1M exhibited a broad nematic phase between 24.9 and 113.7°C on a DSC cooling scan. It was oriented in its nematic phase at a substrate coated with polyimide and unidirectionally rubbed with a nylon cloth. During polymerization, the ordering of the liquid-crystal molecules was fixed, yielding a uniaxially crosslinked network. The clear liquid-crystal networks (LCNs) exhibited a birefringence between 0.14 and 0.19, depending on the polymerization temperature. Finally, a nonmesogenic diluent, tetra(ethylene glycol)diacrylate, was mixed with 1M, subsequently decreasing the birefringence of the obtained LCNs. The LCNs containing nonmesogenic diluent exhibited not only a smaller birefringence but also a weaker birefringence dispersion in the visible region.
AB - The photoinitiated polymerization of 2-chloro-1,4-phenylene bis[4-[6-(acryloyloxy)hexyloxy]benzoate] (1M) was studied. The monomer 1M exhibited a broad nematic phase between 24.9 and 113.7°C on a DSC cooling scan. It was oriented in its nematic phase at a substrate coated with polyimide and unidirectionally rubbed with a nylon cloth. During polymerization, the ordering of the liquid-crystal molecules was fixed, yielding a uniaxially crosslinked network. The clear liquid-crystal networks (LCNs) exhibited a birefringence between 0.14 and 0.19, depending on the polymerization temperature. Finally, a nonmesogenic diluent, tetra(ethylene glycol)diacrylate, was mixed with 1M, subsequently decreasing the birefringence of the obtained LCNs. The LCNs containing nonmesogenic diluent exhibited not only a smaller birefringence but also a weaker birefringence dispersion in the visible region.
UR - http://www.scopus.com/inward/record.url?scp=0033225760&partnerID=8YFLogxK
U2 - 10.1002/(SICI)1099-0518(19991101)37:21<3929::AID-POLA8>3.0.CO;2-9
DO - 10.1002/(SICI)1099-0518(19991101)37:21<3929::AID-POLA8>3.0.CO;2-9
M3 - Article
AN - SCOPUS:0033225760
VL - 37
SP - 3929
EP - 3935
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
SN - 0887-624X
IS - 21
ER -