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dc.contributor.authorHsu, CSen_US
dc.contributor.authorChu, PHen_US
dc.contributor.authorChang, HLen_US
dc.contributor.authorHsieh, THen_US
dc.date.accessioned2014-12-08T15:01:27Z-
dc.date.available2014-12-08T15:01:27Z-
dc.date.issued1997-09-30en_US
dc.identifier.issn0887-624Xen_US
dc.identifier.urihttp://hdl.handle.net/11536/301-
dc.description.abstractThe synthesis of side-chain liquid crystalline polysiloxanes containing either 4-[(S)-2-methyl-1-butoxy] phenyl 4-(alkenyloxy)benzoate or laterally fluoro-, chloro-, bromo-, and methoxy-substituted 4-[(S)-2-methyl-1-butoxy] phenyl 4-(alkenyl oxy)benzoate mesogenic side groups is presented. The mesomorphic properties of the synthesized polymers have been characterized by optical polarizing microscopy, differential scanning calorimetry, and X-ray diffraction measurements. The effects of spacer length and lateral substituent on the mesomorphic properties of the obtained polymers are examined. The five polymers which contain three methylene units in the spacers show no mesophase, while the five polymers which contain eleven methylene units in the spacer display smectic mesomorphism. Among the other fifteen polymers which contain respectively four, five, or six methylene units in the spacers, those with small fluoro and chloro substituents reveal respectively an Sd phase, while those with bulky bromo and methoxy substituents show no liquid crystalline behavior. The experimental results demonstrate that introducing a bulky lateral substituent into the mesogenic core of a polymer depresses the tendency to form a mesophase. Furthermore, the technique of thermally stimulated current has been used to study the dipolar relaxation mechanisms in a side-chain liquid crystalline polysiloxane. (C) 1997 John Wiley & Sons Inc.en_US
dc.language.isoen_USen_US
dc.subjectpolysiloxanesen_US
dc.subjectliquid crystalline polymersen_US
dc.subjectlateral substitution effecten_US
dc.subjectthermal stimulated currenten_US
dc.titleEffect of lateral substituents on the mesomorphic properties of side-chain liquid crystalline polysiloxanes containing 4-[(S)-2-methyl-1-butoxy]phenyl 4-(alkenyloxy)benzoate side groupsen_US
dc.typeArticleen_US
dc.identifier.journalJOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRYen_US
dc.citation.volume35en_US
dc.citation.issue13en_US
dc.citation.spage2793en_US
dc.citation.epage2800en_US
dc.contributor.department交大名義發表zh_TW
dc.contributor.department應用化學系zh_TW
dc.contributor.departmentNational Chiao Tung Universityen_US
dc.contributor.departmentDepartment of Applied Chemistryen_US
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