High strength disclinations in liquid crystalline polymers with X-shaped two-dimensional mesogenic units

Li, Lei; Zhang, Shuyuan; Li, Zifa

doi:10.1016/j.polymer.2004.01.041

Cited by 2 publications

(4 citation statements)

References 18 publications

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“…Meanwhile, 4-n-alkylbenzoic acids 13 were first transformed to their corresponding acyl chlorides, which subsequently reacted with intermediate 15 to provide the desired Xshaped monomers 7-m. Comparing with traditional mesogenic hydroquinone derivative monomers (Compound 1, Scheme 1), which had to be prepared through long synthetic routes including oxidation, substitution, and reduction reactions, [16][17][18][19][20][21][22][23][24][25][26][27] these new X-shaped monomers are oxidative inert, highly air-stable and much easier to access.…”

Section: Synthesis and Characterization Of The Polymersmentioning

confidence: 99%

“…Among them, side‐on MCLCPs, also known as shish‐kebab‐type LCPs or X‐shaped LCPs, comparing with the other three kinds of LCPs, have been much less studied in the past twenty years . One of the main reasons is that the known synthetic protocols of preparing side‐on MCLCPs were very limited.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, side-on MCLCPs, also known as shish-kebabtype LCPs 16 or X-shaped LCPs, 17,18 comparing with the other three kinds of LCPs, have been much less studied in the past twenty years. [19][20][21][22][23][24][25][26][27] One of the main reasons is that the known synthetic protocols of preparing side-on MCLCPs were very limited. As shown in Scheme 1, most of previously reported side-on MCLCPs were prepared by solutionpolycondensation of the mesogenic hydroquinone derivative 1 with various alkane-a,x-dioic acid dichlorides, giving the corresponding polymers 2 and 3 with flexible or semi-rigid backbones, respectively.…”

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confidence: 99%

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Side‐on main‐chain liquid crystalline polymers prepared by acyclic diene metathesis polymerization and thiol‐ene click step‐growth polymerization

Yang

Lin

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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In this manuscript, we design and synthesize a series of X‐shaped mesogenic monomers, bearing two terminal‐alkene tails. Starting from these X‐shaped monomers, acyclic diene metathesis polymerization and thiol‐ene polyaddition are applied for the first time to prepare two series of side‐on main‐chain liquid crystalline polymers (LCPs), respectively. The mesomorphic behaviors and structure‐property relationships of these new polymers are studied in detail by a combination of 1H NMR, GPC, TGA, DSC, POM, and XRD experiments. It turns out that the length of alkoxy terminal chains of the embedded mesogens and the length of the spacer connecting two adjacent mesogens on the polymer backbones markedly influence the mesomorphic properties. Furthermore, a side‐on main‐chain liquid crystalline elastomer fiber is prepared by crosslinking the LCP using a UV‐sensitive bifunctional benzophenone crosslinker. In comparison with the pure polymer fiber's monodomain alignment, the crosslinked elastomer fiber however shows nonaligned polydomain structure, probably due to the order competitions between the mixed crosslinkers, mesogens, and polymer backbones. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 1086–1098

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Section: Synthesis and Characterization Of The Polymersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Side‐on main‐chain liquid crystalline polymers prepared by acyclic diene metathesis polymerization and thiol‐ene click step‐growth polymerization

Yang

Lin

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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“…[56][57][58][59][60] These telechelics could be used as macroinitiators in the synthesis of a block copolymer. [61][62][63][64][65][66][67][68][69][70] Various methods are used for developing block copolymers which include controlled ''living'' free radical polymerization techniques, such as nitroxide-mediated polymerization, 62 reversible additionfragmentation chain transfer, 63 and atom transfer radical polymerization (ATRP). 52,56,58,60,[71][72][73] ATRP is one of the welldeveloped controlled polymerization and it has been attracting much attention as a new route to well-defined polymers with low polydispersities.…”

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confidence: 99%

Poly[(R)‐3‐hydroxybutyrate)]/poly(styrene) blends compatibilized with the relevant block copolymer

Abdelwahab

Martinelli

Alderighi

et al. 2012

J. Polym. Sci. A Polym. Chem.

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A novel triblock copolymer PS–PHB–PS based on the microbial polyester Poly[(R)‐3‐hydroxybutyrate)] (PHB) and poly(styrene) (PS) was prepared to be used as compatibilizer for the corresponding PHB/PS blends. It was prepared in a three‐step procedure consisting of (i) transesterification reaction between ethylene glycol and a high‐molecular‐weight PHB, (ii) synthesis of bromo‐terminated PHB macroinitiator, and (iii) atom transfer radical polymerization polymerization of styrene initiated by the PHB‐based macroinitiator. Fourier transform infrared, gel permeation chromatography, 1H‐, and 13C‐NMR spectroscopies were used to determine the molecular structure and/or end‐group functionalities at each step of the procedure. Although thermogravimetric analysis showed that the block copolymer underwent a stepwise thermal degradation and had better thermal stability than their respective homopolymers, differential scanning calorimetry displayed that the PHB block in the copolymer could not crystallize, and thus generating a total amorphous structure. Atomic force microscopy images indicated that the block copolymer was phase segregated in a well‐defined morphological structure with nanodomain size of ∼40 nm. Contact angle measurements proved that the wettability properties of the block copolymer were in between those of the PHB and PS homopolymers. Blends analyzed for their morphology and thermal properties showed good miscibility and had well‐defined morphological features. Polymer blends exhibited lower crystallinity and decreased stiffness which was proportional to the amount of compatibilizer content in the blends. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

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High strength disclinations in liquid crystalline polymers with X-shaped two-dimensional mesogenic units

Cited by 2 publications

References 18 publications

Side‐on main‐chain liquid crystalline polymers prepared by acyclic diene metathesis polymerization and thiol‐ene click step‐growth polymerization

Side‐on main‐chain liquid crystalline polymers prepared by acyclic diene metathesis polymerization and thiol‐ene click step‐growth polymerization

Poly[(R)‐3‐hydroxybutyrate)]/poly(styrene) blends compatibilized with the relevant block copolymer

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