A compound and a liquid-crystal composition employing the same are provided. The compound has a structure represented by Formula (I) ##STR00001##
wherein Z.sup.a and Z.sup.b are independently ##STR00002##
A.sup.1, A.sup.2, A.sup.3 and A.sup.4 are independently single bond, ##STR00003##
Z.sup.1, Z.sup.2, Z.sup.3, and Z.sup.4 are independently single bond, ##STR00004##
R is independently hydrogen, or C.sub.1-4 alkyl group; R.sup.1 and R.sup.2 are independently single bond, O(CH.sub.2).sub.n, CHCH(CH.sub.2).sub.2, (CH.sub.2).sub.2CHCH, CHCH, or CC; n is an integer from 1 to 6; B.sup.1 and B.sup.2 are independently ##STR00005##
and, R.sup.3 is hydrogen, or methyl group.

A compound and a liquid-crystal composition employing the same are provided. The compound has a structure represented by Formula (I) ##STR00001##
wherein Z.sup.a and Z.sup.b are independently ##STR00002##
A.sup.1, A.sup.2, A.sup.3 and A.sup.4 are independently single bond, ##STR00003##
Z.sup.1, Z.sup.2, Z.sup.3, and Z.sup.4 are independently single bond, ##STR00004##
R is independently hydrogen, or C.sub.1-4 alkyl group; R.sup.1 and R.sup.2 are independently single bond, O(CH.sub.2).sub.n, CHCH(CH.sub.2).sub.2, (CH.sub.2).sub.2CHCH, CHCH, or CC; n is an integer from 1 to 6; B.sup.1 and B.sup.2 are independently ##STR00005##
and, R.sup.3 is hydrogen, or methyl group.

A shape-programmable liquid crystal elastomer comprises polymerized, nematic monomers. The monomers are organized into a plurality of voxels with each voxel having a director orientation.

A shape-programmable liquid crystal elastomer comprises polymerized, nematic monomers. The monomers are organized into a plurality of voxels with each voxel having a director orientation.

A compound represented by the following formula (1):

##STR00001## wherein R.sup.1 is a 2n-valent group having 1 to 60 carbon atoms; R.sup.2 to R.sup.5 are each independently a linear, branched, or cyclic alkyl group having 1 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, an alkenyl group having 2 to 30 carbon atoms, an alkoxy group having 1 to 30 carbon atoms and optionally having a substituent, a halogen atom, a nitro group, an amino group, a carboxylic acid group, a group in which a hydrogen atom of a hydroxy group is replaced with a vinylphenylmethyl group, a group selected from the group consisting of groups represented by the following formula (A), a thiol group, or a hydroxy group, wherein at least one of the R.sup.2 to the R.sup.5 is a group selected from a group represented by the formula (A); m.sup.2 and m.sup.3 are each independently an integer of 0 to 8; m.sup.4 and m.sup.5 are each independently an integer of 0 to 9, provided that m.sup.2, m.sup.3, m.sup.4, and m.sup.5 are not 0 at the same time; n is an integer of 1 to 4; and p.sup.2 to p.sup.5 are each independently an integer of 0 to 2:

##STR00002##

Disclosed herein are compositions and methods for preventing or treating acute or chronic oral mucositis, esophagitis, enteritis, colitis, or gastrointestinal acute radiation syndrome (GI-ARS) caused by radiation exposure, using one or more enteron sorbent polymers administered gastrointestinally (e.g. orally, via feeding or gastric tube, via ostomy, or rectally).

Disclosed herein are compositions and methods for preventing or treating acute or chronic oral mucositis, esophagitis, enteritis, colitis, or gastrointestinal acute radiation syndrome (GI-ARS) caused by radiation exposure, using one or more enteron sorbent polymers administered gastrointestinally (e.g. orally, via feeding or gastric tube, via ostomy, or rectally).

The present invention provides a self-repairing material having self-repairing properties and shape memory properties, as well as high dynamic strength, and also provides a method for manufacturing the same. The self-repairing material of the present invention comprises a polymer comprising specific monomer units in specific ratios, and the concentration of the monomer units is within a specific range.

The present invention provides a nitrile group-containing highly-saturated copolymer rubber comprising an ,-ethylenically unsaturated nitrile monomer unit (a) in a content of 28 wt % or more and a conjugated diene monomer unit (b) in a content of 20 to 72 wt %, and having an iodine value of 120 or less, wherein the conjugated diene monomer unit (b) is at least partially hydrogenated, and a proportion of an isoprene unit in the conjugated diene monomer unit (b) is 33 wt % or more.

The present invention provides a nitrile group-containing highly-saturated copolymer rubber comprising an ,-ethylenically unsaturated nitrile monomer unit (a) in a content of 28 wt % or more and a conjugated diene monomer unit (b) in a content of 20 to 72 wt %, and having an iodine value of 120 or less, wherein the conjugated diene monomer unit (b) is at least partially hydrogenated, and a proportion of an isoprene unit in the conjugated diene monomer unit (b) is 33 wt % or more.