Synthesis and Characterization of Poly(methylsiloxane)S Containing 4-[S(-)-2-Methyl-1 -Butoxy1-4′ -[p-(ω-alkan-l-yloxy)benzoyloxy]-α-methylstilbene Side Groups
作者:
Virgil Percec,
Chu-San Wang,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1991)
卷期:
Volume 28,
issue 8
页码: 687-713
ISSN:0022-233X
年代: 1991
DOI:10.1080/00222339108054051
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The syntheses of poly(methylsiloxane)s containing 4-[S(-)-L-methyl-1 -butoxy] -4′-[p-(ω -alkan -1 -yloxy)benzoyloxy] -a-methylstilbene side groups containing 11-undecanyl (18), 8-octyl (19), 6-hexyl (20), and 3-propyl (21), of a poly[(50-55%)-methyl-co-(45-50%)-dimethylsiloxane] containing 4-[S(-)-2-methyl-1-butoxy]-4′-[p-(8-octan-1-yloxy)benzoyloxy]-α-methylstilbene side groups (22) and of a poly(methylsiloxane) containing a 1:1 molar ratio of 4-[S(-)-2-methyl-1 -butoxyl]-4′ -[p-(8-octan-1 -yloxy)benzoyloxy] -α-methylstilbene and 4-[S(-)-2-methyl-l -butoxyl-4′ -[p-(6-hexan-1-yloxy)-benzoyloxyl-α-methylstilbene side groups (23) are described. All polymers and copolymers were characterized by a combination of differential scanning calorimetry and thermal optical polarized microscopy techniques.18exhibits an enantiotropicSA, while19, 20, 21, and23display both enantiotropicsAandS*cmesophases.22exhibits only an enantiotropic s: mesophase. In addition, all polymers and copolymers exhibit sidechain crystallization. These results have demonstrated that extending the length of the rigid part of the mesogenic unit of 4-[S(-)-2-methyl-l-butoxy]-4′-(ω-alkan-l-yloxy)-α-methylstilbene to 4-[S(-)-2-methyl-l-butoxy]-4′ -[p-(ω-alkan-l -yloxy)benzoyloxy]-α-methylstilbene increases the tendency of the resulting poly(methylsiloxane)s toward polymesomorphism.
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