Synthesis and Properties of Mesogen-Jacketed Liquid Crystalline Polymers with Asymmetry Mesogenic Core

Chen, Si; Gao, Longcheng; Zhao, Xiaodong; Chen, Xiaofang; Fan, Xinghe; Xie, Peiying; Zhou, Qifeng

doi:10.1021/ma0703554

Cited by 54 publications

(55 citation statements)

References 25 publications

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“…New structures with functional groups were designed. 31,32 Interesting results were obtained. However, controlled radical polymerization techniques were less frequently used.…”

Section: Molecular Design and Synthesis Of Mjlcpsmentioning

confidence: 95%

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Jacketed polymers: Controlled synthesis of mesogen‐jacketed polymers and block copolymers

Gao

Fan

Shen

et al. 2008

J. Polym. Sci. A Polym. Chem.

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The controlled radical polymerization of mesogen‐jacketed liquid crystalline polymers has triggered great interests in synthesis of complex structures as well as well‐defined linear homopolymers with controlled molecular weight and narrow molecular weight distributions. This review highlights the synthetic strategies of controlled radical polymerization of linear homopolymers, star polymers, superbranched polymers, graft polymers, block copolymers, star block copolymers, and so on. The employed living methods include nitroxide‐mediated radical polymerization and atom transfer radical polymerization. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 319–330, 2009

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“…New structures with functional groups were designed. 31,32 Interesting results were obtained. However, controlled radical polymerization techniques were less frequently used.…”

Section: Molecular Design and Synthesis Of Mjlcpsmentioning

confidence: 95%

“…Recently, a new kind of MJLCP (see Scheme 6) with unbalanced mesogenic side groups bonded to the main chain was designed and synthesized by ATRP. 31 Smectic A (S A ) LC phase was firstly discovered in MJLCPs system.…”

Section: Controlled Synthesis Of Mesogen-jacketed Polymers and Block mentioning

confidence: 99%

Jacketed polymers: Controlled synthesis of mesogen‐jacketed polymers and block copolymers

Gao

Fan

Shen

et al. 2008

J. Polym. Sci. A Polym. Chem.

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“…2 Recently, a smectic A phase was identified for the first time in the MJLCP family. 3 MJLCPs can be synthesized by controlled radical polymerization and thus introduced into rod-coil block copolymers to serve as ''rods' '. 4 Rod-coil block copolymers have been a hot topic due to their typical self-assembly behavior of forming various supramolecular structures.…”

Section: Introductionmentioning

confidence: 99%

ABA type liquid crystalline triblock copolymers by combination of living cationic polymerizaition and ATRP: synthesis and self-assembly

et al. 2008

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Lamellar and hexagonal-coil-cylinder self-assembled structures of ABA type triblock copolymers containing mesogen-jacketed liquid crystalline polymer (MJLCP) as the rod block, and polyisobutylene (PIB) as the coil middle block were discovered. PIB was synthesized by living cationic polymerization of isobutylene initiated by 1,4-bis(2-chloro-2-propyl)benzene (p-DCC), and then a small amount of styrene was introduced at the end of the PIB chains to form the difunctional PIB macroinitiator with -CH 2 CH(C 6 H 5 )Cl end groups for further atom transfer radical polymerization (ATRP). 2,5-Bis[(4-methoxyphenyl)oxycarbonyl]styrene (MPCS) was block-copolymerized from the difunctional PIB macroinitiators at 110 C. The molecular characterization of the triblock copolymers was performed with 1 H NMR, 13 C NMR, gel permeation chromatography (GPC), and thermogravimetric analysis (TGA). Their phase structures and transitions were investigated by differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS), and polarized optical microscopy experiments. It was demonstrated that the triblock copolymers formed lamellar structures at moderate rod fractions and hexagonal coil cylinders in the rod matrix at high rod fractions. The d-spacing of the microphase-separated structures was influenced by the liquid crystalline phase of rod-like PMPCS blocks.

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“…Both of the monomers are packed so well that several sharp peaks appear at middle angles. Similar to their monomers, polymer PHATP(OC6)2 and PPATP(OC6)2 show a reflections in low‐angle region, d ‐spacing (31.32 and 29.41 Å, respectively) is almost identical to the calculated length of the mesogenic units in monomers (27.20 Å), which means the side chain of the mesogenic units is perpendicular to the main chain 41. The schematic drawing of the layer structure of the PHATP(OC6)2 is shown in Figure 7.…”

Section: Resultsmentioning

confidence: 70%

Luminescent mesogen jacketed poly(1‐alkyne) bearing lateral terphenyl with hexyloxy tail

Peng

Chen

et al. 2010

J. Polym. Sci. A Polym. Chem.

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Mesogen jacketed liquid crystalline poly(1-alkyne) and poly(1-phenyl-1-alkyne) linked pendants of terphenyl mesogens with hexyloxy tails at the waist position (A{RC¼ ¼CA [(CH 2 ) 3 OOC-terpheyl-(OC 6 H 13 ) 2 ]} n A, where R¼ ¼H, PHATP(OC6)2; R¼ ¼C 6 H 5 , PPATP(OC6)2) were synthesized. The influences of structural variations on the thermal, mesomorphic, and luminescent properties were investigated. Polymerizations of all monomers are carried out by WCl 6 -Ph 4 Sn catalysts successfully. The polymers are stable (T d ! 340 C) and soluble in common solvents. The monomers and polymers show enantiotropic SmA phases in the heating and cooling processes, and the lateral side chains of the mesogenic units are perpendicular to the main chain. The ''jacket effect'' of chromophoric terphenyl core ''shell'' around the main chain also contributes to polymers with high photoluminescence, and the pendant-tobackbone energy transfer path is involved in the luminescence process of this polymers. In comparison with monosubstituted polyacetylene PHATP(OC6)2, the disubstituted polyacetylene PPATP(OC6)2 shows better photoluminescence in both THF solution and film, and exhibited about 40 nm red-shifted than PHATP(OC6)2, indicating that the ''jacket effect'' of terphenyl mesogens forces poly(1-phenyl-1-alkyne) backbone to extend in a more planar conformation with a better conjugation.

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Synthesis and Properties of Mesogen-Jacketed Liquid Crystalline Polymers with Asymmetry Mesogenic Core

Cited by 54 publications

References 25 publications

Jacketed polymers: Controlled synthesis of mesogen‐jacketed polymers and block copolymers

Jacketed polymers: Controlled synthesis of mesogen‐jacketed polymers and block copolymers

ABA type liquid crystalline triblock copolymers by combination of living cationic polymerizaition and ATRP: synthesis and self-assembly

Luminescent mesogen jacketed poly(1‐alkyne) bearing lateral terphenyl with hexyloxy tail

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