JIN, SH CHOI, SJ AHN, W CHO, HN CHOI, SK 2024-01-21T22:34:13Z 2024-01-21T22:34:13Z 2021-09-02 1993-03-29 0024-9297 https://pubs.kist.re.kr/handle/201004/146071 A new class of thermotropic side-chain liquid crystalline polymers containing a poly(1,6-heptadiyne) main chain was prepared by metathesis polymerization with transition-metal catalysts. It was found that the MoCl5-based catalyst systems were very effective for the cyclopolymerization of presently investigated monomers. Resulting polymers exhibited good solubility in common organic solvents such as tetrahydrofuran (THF), chloroform, etc., and could be easily cast on glass plates to give black shiny thin films. The structure of the products was confirmed by IR, MS, UV-visible, and H-1 and C-13 NMR. The number-average average molecular weight (M(n)) values of the polymers were in the range of 4.9 X 10(3)-1.1 x 10(5) relative to polystyrene standards by GPC. Thermal behavior, morphology, and electrical conductivity were investigated by using differential scanning calorimetry (DSC), cross-polarized optical microscopy, X-ray diffraction analysis, and an LCR meter. Both monomer and polymer displayed enantiotropic liquid crystallinity showing the reversible phase transitions. Room-temperature conductivities of the undoped and I2-doped polymers were found to be about 10(-11) and 10(-2)-10(-3) S/cm, respectively. English AMER CHEMICAL SOC TRANSITION-METAL CATALYSTS MESOGENIC GROUPS CYCLOPOLYMERIZATION PHOSPHAZENES DIPROPARGYLMALONATE SYSTEMS SYNTHESIS AND CHARACTERIZATION OF NOVEL SIDE-CHAIN LIQUID-CRYSTALLINE POLYMERS WITH A POLY(1,6-HEPTADIYNE) MAIN CHAIN Article 10.1021/ma00059a002 1 MACROMOLECULES, v.26, no.7, pp.1487 - 1492 MACROMOLECULES 26 7 1487 1492 scie scopus A1993KV50900002 2-s2.0-0027556891 Polymer Science Polymer Science Article TRANSITION-METAL CATALYSTS MESOGENIC GROUPS CYCLOPOLYMERIZATION PHOSPHAZENES DIPROPARGYLMALONATE SYSTEMS synthesis characterization side-chain liquid crystalline polymers poly(1,6-heptadiyne)