- Non-Uniform Optical Inscription of Actuation Domains in a Liquid Crystal Polymer of Uniaxial Orientation: An Approach to Complex and Programmable Shape Changes
-
Achieving complex shape change of liquid-crystal polymer networks (LCNs) under stimulation generally requires spatial configuration of the orientation direction, that is, patterned directors, of liquid crystal monomers prior to polymerization by means of treated surfaces. A strategy is demonstrated that needs only the simple uniaxial orientation of mesogens (monodomain) induced by mechanical stretching of LCNs. Using a rationally designed liquid crystal polymer, photocrosslinking is utilized to pattern or spatially organize the actuating monodomains in order to generate a differential contractile and/or extensional force field required for targeted shape change. Moreover, the approach enables versatile actuation modes and allows multiple shape changes to be programmed on a single piece of the polymer. This important feature is demonstrated with a specimen cut to have eight strips that, upon thermal stimulation, simultaneously display eight types of shape morphing.
- Yang, Rong,Zhao, Yue
-
-
Read Online
- Diamine compound
-
Provided is a liquid crystal orientation agent comprising at least one polymer selected from polyimide precursors obtained by reacting an amine component comprising a diamine compound represented by formula [1] and a tetracarboxylic dianhydride component, and polyimides obtained by imidation of the same. [1] (In the formula, R3 is a group selected from -CH2-, -O-, -CONH-, -NHCO-, -COO-, -OCO-, -NH-, and -CO-. R4 is a C1-30 alkylene group, divalent carbon ring, or heterocycle, and one or a plurality of the hydrogen atoms of the alkylene group, divalent carbon ring, or heterocycle can be optionally substituted by fluorine atoms or organic groups. Moreover, when there are adjacent -O-, -NHCO-, -CONH-, -COO-, -OCO-, -NH-, or -CO-, R4 can be such that these adjacent groups are substituted by -CH2-. R5 is -CH2-, -O-, -CONH-, -NHCO-, -COO-, -OCO-, -NH-, -CO-, or a single bond. R6 is a group that goes through photodimerization. R7 is a single bond or a C1-30 alkylene group, divalent carbon ring, or heterocycle, and one or a plurality of the hydrogen atoms of the alkylene group, divalent carbon ring, or heterocycle can be substituted by fluorine atoms or organic groups. Moreover, when there are adjacent -O-, -NHCO-, -CONH-, -COO-, -OCO-, -NH-, or -CO-, R7 can be such that these adjacent groups are substituted by -CH2-. R8 is a photopolymerizable group.)
- -
-
-
- Synthesis of side-chain liquid-crystalline cinnamide polymers based on post polymer reaction
-
We prepared novel photoreactive liquid crystalline (LC) polymer via polymer reaction. The cinnamic acid activated ester easily converted to amide by mixing with amine derivative and solubility of the polymer reduced due to hydrogen bonding. Upon exposure
- Kondo, Mizuho,Dozono, Yoshiyuki,Goto, Kohei,Kawatsuki, Nobuhiro
-
experimental part
p. 121 - 130
(2012/10/18)
-
- Optical properties of chiral nematic side-chain copolymers bearing cholesteryl and azobenzene building blocks
-
Thermotropic chiral nematic (N*) side-chain copolymers (CPs) bearing cholesteryl and azobenzene units were synthesized to investigate the structure-property relationships of the acrylates of the chiral, achiral, and photochromic monomers of free radical polymerization-derived polymers. The polar effect of chlorine substitution on the benzene ring of the chiral monomer (M3*) widened the mesophase transition temperature only at the monomer level, but no remarkable effect on the mesomorphic, optical or thermochromism of the corresponding CPs was observed. An examination of the CPs prepared using differential scanning calorimetry and hot-stage polarizing microscopy showed that all the CPs exhibited a cholesteric nematic phase (N*), and increasing the content of the cholesteryl units in the CPs displayed only the N* phase over a much wider temperature range. On cooling from the isotropic melt of N* CPs, selective reflections of visible light that changed from short to long wavelengths were observed. The photolysis of CPs revealed that CP1-CP4 undergo reversible photoisomerization and that CP5 and CP6 undergo irreversible photoisomerization. The rate of isomerization depends on the type (-N=N-, -CH=CH-, and both) and content of photochromic units in the CPs.
- Liu, Jui-Hsiang,Chou, Yen-Ling,Balamurugan, Rathinam,Tien, Kai-Hsin,Chuang, Wen-Tung,Wu, Ming-Zu
-
experimental part
p. 770 - 780
(2012/02/02)
-
- MULTI-FUNCTIONAL MONOMER HAVING A PHOTOREACTIVE GROUP, ALIGNMENT FILM FOR LCD USING THE MONOMER, AND LCD COMPRISING THE ALIGNMENT FILM
-
Disclosed is a multi-functional monomer including a heat-curable functional group as well as a typical photoreactive group. In the multi-functional monomer, the photoreactive group is not chained to a main chain of a polymer. Thus, since it is possible to
- -
-
Page/Page column 13-14
(2010/11/26)
-
- CHIRAL DOPANT WITH PHENYLETHANEDIOL FUNCTIONALITY
-
The invention pertains to a phenylethanediol derivative having at least one polymerizable group, characterized in that the phenylethanediol derivative further comprises at least one photo-convertible group for adjusting the helical twisting power of the phenylethanediol derivative. According to a preferred embodiment the phenylethanediol has the formulawherein A stands for a bond or a p-phenylene group; B and B' are independently (O)p-CoH2o-O-CO-CR'=CH2, o being 2-12, p being 0 or 1, and R' being H or CH3; P stands for a CH2 or a C=O group; Q and Q' are independently selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN;n is an integer from 1 to 3; andm is an integer from 0 to 2; and:wherein A stands for a bond or a p-phenylene group; B is (O)p-CoH2o-O-CO-CR'=CH2, o being 2-12, p is 1, and R' being H or CH3; P stands for a CH2 or a C=O group; Q is selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN; andm is an integer from 0 to 2.
- -
-
-