Preparation of thermotrophic liquid crystalline polymers involving a novel spacer unit based on vinylacetic acid

Day, Gary M.; Jackson, W. Roy; Jacobs, Howard A.; Kim, Hee Jin; Simon, George P.; Sarna, Rajinda; Watson, Keith G.

doi:10.1007/bf00558031

Cited by 12 publications

(1 citation statement)

References 10 publications

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“…Similarly, Chain S. HSU et al synthesized polysiloxanes homopolymers with cyclohexane based mesogenic units, which exhibited conformational isomerism; the side chain crystallization was efficiently avoided, even with usage of very long spacers [143]. In addition, crystallization can also be limited by carrying out block copolymers possessing mesogen structures with non-mesogen ones [144], or by introduction of a voluminous group in spacers [145].…”

Section: The Relationship Between the Molecular Structures And Lc mentioning

confidence: 99%

Polysiloxane-Based Side Chain Liquid Crystal Polymers: From Synthesis to Structure–Phase Transition Behavior Relationships

et al. 2018

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Abstract:Organosilicon polymer materials play an important role in certain applications due to characteristics of much lower glass transition temperatures (T g ), viscosities, surface energy, as well as good mechanical, thermal stabilities, and insulation performance stemming from the higher bond energy and the larger bond angles of the adjacent silicon-oxygen bond. This critical review highlights developments in the synthesis, structure, and phase transition behaviors of polysiloxane-based side chain liquid crystal polymers (PSCLCPs) of linear and cyclic polysiloxanes containing homopolymers and copolymers. Detailed synthetic strategies are elaborated, and the relationship between molecular structures and liquid crystalline phase transition behaviors is systematically discussed, providing theoretical guidance on the molecular design of the materials.

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Section: The Relationship Between the Molecular Structures And Lc mentioning

confidence: 99%

Polysiloxane-Based Side Chain Liquid Crystal Polymers: From Synthesis to Structure–Phase Transition Behavior Relationships

et al. 2018

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Synthesis and Dielectric Study of New Liquid‐crystalline Polysiloxanes Presenting a Thioether Spacer

Gilles

Milano

Vernet

2003

Macro Chemistry & Physics

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Three new cyanobiphenyl polysiloxanes presenting long thioether spacers have been carried out. This type of spacer leads to very stable liquid‐crystalline polymers at room temperature and remove the crystallinity phenomenon. Dielectric analysis results show that the thioether spacer brings much more molecular flexibility to the system.Example of an “interdigitated” structure observed by X‐ray analysis.magnified imageExample of an “interdigitated” structure observed by X‐ray analysis.

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Molecular engineering of liquid crystalline polymers by “living” polymerization. XXXII. Synthesis and “living” cationic polymerization of 3‐fluoro‐4′‐(ω‐vinyloxyalkoxy)‐4‐biphenylyl (2r,3s)‐2‐fluoro‐3‐methylpentanoate with undecanyl and octyl alkyl groups

Perce

Oda

1995

J. Polym. Sci. A Polym. Chem.

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The synthesis and “living” cationic polymerization of 3‐fluoro‐4′‐(11‐vinyloxyundecany‐loxy)‐4‐biphenylyl (2R,3S)‐2‐fluoro‐3‐methylpentanoate (12‐11) and 3‐fluoro‐4′‐(8‐vi‐nyloxyoctyloxy)‐4‐biphenylyl (2R,3S)‐2‐fluoro‐3‐methylpentanoate (12‐8) are presented. Poly (12‐11)s and poly (12‐8)s with degrees of polymerization from 4.0 to 16.5 and poly‐dispersities ≤ 1.13 have been synthesized and characterized by differential scanning cal‐orimetry (DSC) and thermal optical polarized microscopy. Over the entire range of molecular weights poly (12‐11)s and poly (12‐8)s exhibit an enantiotropic SA and an unidentified SX phase. In addition, regardless of its molecular weight, poly (12‐8) exhibits a S*c phase in between the SA and Sx phases. Poly (12‐11) and poly (12‐8) show lower transition tem‐peratures and broader temperature ranges of all their mesophases as compared to the corresponding polymers without a fluorine atom on the biphenyl group. The role of the connecting group between the biphenyl and chiral group of the mesogenic unit on the phase behavior of these polymers is also discussed. Copolymers of 12‐8 with (2R,3S)‐2‐fluoro‐3‐methylpentyl 4′‐(11‐vinyloxyundecanyloxy)biphenyl‐4‐carboxylate (13‐11) {i.e., poly‐[(12‐8)‐co‐(13‐11)] (X/Y), where X/Y represents the molar ratio of monomer 12‐8 to monomer 13‐11} with DP of ca. 11 and polydispersities lower than 1.23 were also syn‐thesized and characterized. Their SA and S*c mesophases exhibit continuous dependences of composition and this support the assignment of the mesophases exhibited by poly (12‐8). © 1995 John Wiley & Sons, Inc.

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Preparation of thermotrophic liquid crystalline polymers involving a novel spacer unit based on vinylacetic acid

Cited by 12 publications

References 10 publications

Polysiloxane-Based Side Chain Liquid Crystal Polymers: From Synthesis to Structure–Phase Transition Behavior Relationships

Polysiloxane-Based Side Chain Liquid Crystal Polymers: From Synthesis to Structure–Phase Transition Behavior Relationships

Synthesis and Dielectric Study of New Liquid‐crystalline Polysiloxanes Presenting a Thioether Spacer

Molecular engineering of liquid crystalline polymers by “living” polymerization. XXXII. Synthesis and “living” cationic polymerization of 3‐fluoro‐4′‐(ω‐vinyloxyalkoxy)‐4‐biphenylyl (2r,3s)‐2‐fluoro‐3‐methylpentanoate with undecanyl and octyl alkyl groups

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