Ferroelectric liquid crystalline polyoxetanes bearing chiral dimesogenic pendants

Lee, Dong Kun; Oh, Dong Keun; Yelamaggad, C. V.; Nagamani, S. Anitha; Jin, Jung‐Il

doi:10.1039/b202594a

Cited by 13 publications

(7 citation statements)

References 36 publications

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“…Another interesting observation made is that entropy changes (Δ H m and Δ H i ) for melting and isotropization are about the same in magnitude. This implies that molecular order in the mesophase is very high when compared with fluid smectic and nematic phases 30, 31. The similar phenomenon is also observed for entropy changes (Δ S m and Δ S i ) for the same phase transitions.…”

Section: Resultssupporting

confidence: 65%

All hydrocarbon main‐chain thermotropic liquid crystalline polymers, poly(1,1′‐biphenylene‐4,4′‐alkenediyl)s, prepared by the ADMET method and their hydrogenated polymers, poly(1,1′‐biphenylene‐4,4′‐alkanediyl)s

Joo

Jin

2004

J. Polym. Sci. A Polym. Chem.

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A series of poly(4,4Ј-biphenylenealkenylene)s and copolymers were prepared by the acyclic diene metathesis (ADMET) polymerization of 4,4Ј-bis(alkenylene)1,1Ј-biphenyls. Unsaturated polymers thus prepared were then hydrogenated to produce the corresponding saturated polymers. All the polymers were found to be thermotropic and to form solidlike smectic phases in melt. Their liquid crystallinity (LC) was studied by differential scanning calorimetry (DSC), X-ray diffractometry, and polarizing microscopy. We observed that one of the phenylene units of the biphenyl structure could selectively be hydrogenated at an elevated temperature.

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Section: Resultssupporting

confidence: 65%

All hydrocarbon main‐chain thermotropic liquid crystalline polymers, poly(1,1′‐biphenylene‐4,4′‐alkenediyl)s, prepared by the ADMET method and their hydrogenated polymers, poly(1,1′‐biphenylene‐4,4′‐alkanediyl)s

Joo

Jin

2004

J. Polym. Sci. A Polym. Chem.

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“…Optimal conditions have not been exhaustively investigated to reduce the P(EAMO) PDI. Several factors such as catalyst, reaction temperature, and purification technique influence PDI of polymers synthesized through ROP. , From M n by end-group analysis, P(EAMO) DP was 30. This DP was used for mass balance calculations in subsequent functionalization reactions, as GPC is an indirect determination based on polystyrene standards.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Clickable Cytocompatible Poly(ethylene glycol)-Grafted Polyoxetane Brush Polymers

2012

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We report a new family of clickable poly(ethylene glycol) (PEG)-grafted polyoxetane brush polymers as a potential modular platform for delivery of drugs and imaging agents. 3-Ethyl-3-hydroxymethyloxetane (EHMO) monomer reacted with propargyl benzenesulfonate in the presence of sodium hydride to yield alkyne-substituted monomer (EAMO). Subsequently, cationic ring-opening polymerization using boron trifluoride diethyl etherate catalyst and 1,4-butanediol initiator produced P(EAMO) homopolymer with a DP of ∼30 (30 alkynes per chain). Methoxypoly(ethylene glycol) azide (mPEG750-azide) prepared from mPEG750 (750 g mol–1) was grafted to P(EAMO) via copper(I)-catalyzed alkyne–azide cycloaddition (CuAAC) click chemistry. Water-soluble cytocompatible P(EAMO)-g-PEG brush polymers with controlled degrees of PEGylation were synthesized by varying the feed molar ratio of mPEG750-azide to alkyne (25:100, 50:100, 75:100, and 100:100). 1H NMR, GPC, end-group analysis, FTIR, and DSC were applied for polymer characterization. The utility of P(EAMO)-g-PEG for carrying imaging agents was demonstrated by preparing fluorescently labeled P(EAMO)-g-PEG. 5-(Aminoacetamido)fluorescein (AAF) was used as a model compound. Fluorescein-carrying P(EAMO)-g-PEG was synthesized by click coupling bifunctional spacer 6-azidohexanoic acid (AHA) to P(EAMO)-g-PEG and subsequently coupling of AAF to AHA with EDC/NHS chemistry.

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“…A cholesterol 42 group was also attached to a PPX as well as a PPV to determine if the polymers can be bestowed with liquid crystalline properties. 1,2,[43][44][45] The syntheses of these derivatives began by condensing cholesterol with various diols followed by attachment to the aforementioned monomer precursors. Standard polymerization conditions were used, and the resulting polymers were analyzed using DSC, polarized-light optical microscopy (POM) and powder X-ray diffraction (XRD); data were also collected for the monomeric precursors to facilitate comparisons (see Fig.…”

Section: Functionalized Ppx and Ppv Derivatives: Synthesis And Applic...mentioning

confidence: 99%

New classes of functionalized parylenes and poly(phenylene vinylene)s via coupling of dihaloxylyl diesters

Lyu

Bielawski

2022

Polym. Chem.

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Ferroelectric liquid crystalline polyoxetanes bearing chiral dimesogenic pendants

Cited by 13 publications

References 36 publications

All hydrocarbon main‐chain thermotropic liquid crystalline polymers, poly(1,1′‐biphenylene‐4,4′‐alkenediyl)s, prepared by the ADMET method and their hydrogenated polymers, poly(1,1′‐biphenylene‐4,4′‐alkanediyl)s

All hydrocarbon main‐chain thermotropic liquid crystalline polymers, poly(1,1′‐biphenylene‐4,4′‐alkenediyl)s, prepared by the ADMET method and their hydrogenated polymers, poly(1,1′‐biphenylene‐4,4′‐alkanediyl)s

Synthesis and Characterization of Clickable Cytocompatible Poly(ethylene glycol)-Grafted Polyoxetane Brush Polymers

New classes of functionalized parylenes and poly(phenylene vinylene)s via coupling of dihaloxylyl diesters

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