Synthesis of Liquid Crystalline Oligomeric Polyoxetanes with Two Mesogenic Groups in the Repeating Unit

Kawakami, Yusuke; Kato, Yasuhiro

doi:10.1295/polymj.29.775

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…[22][23][24] In contrast, monomers having bulky substituents give rise to low MW polymers, most probably due to steric hindrance in the propagation stage. 27 The same phenomenon has been observed by us previously. 28 The two polymers are semicrystalline, and their glass transition temperatures are 68.2 and 72.5 uC, respectively (see Fig.…”

Section: General Properties Of Pox-4dm and Pox-5dmsupporting

confidence: 85%

“…The cationic initiator utilized in the polymerization was BF 3 ?OEt 2 , which has been widely used in the ring-opening polymerization of oxetane and its derivatives. [22][23][24]27,28 Methylene chloride was the reaction medium. Polymerization proceeded homogenously throughout the polymerization.…”

Section: General Properties Of Pox-4dm and Pox-5dmmentioning

confidence: 99%

“…We found that some of them formed incommensurate and twisted grain boundary (TGB) phases. 10,13,15,16 On the other hand, many side-chain liquid crystalline polymers (SCLCPs) based on poly(meth)acrylate, [18][19][20][21] polyoxetane, [22][23][24][25][26][27][28] and polysiloxane [29][30][31][32][33][34][35][36][37][38][39] backbones, with and without chiral centers, have been reported. In particular, some of the SCLCPs bearing chiral centers exhibit the chiral smectic C (Sc*) phase and, thus, ferroelectric properties.…”

Section: Introductionmentioning

confidence: 99%

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Ferroelectric liquid crystalline polyoxetanes bearing chiral dimesogenic pendants

Lee

Yelamaggad

et al. 2002

J. Mater. Chem.

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Section: General Properties Of Pox-4dm and Pox-5dmsupporting

confidence: 85%

Section: General Properties Of Pox-4dm and Pox-5dmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ferroelectric liquid crystalline polyoxetanes bearing chiral dimesogenic pendants

Lee

Yelamaggad

et al. 2002

J. Mater. Chem.

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“…Oxetane polymerization has also received considerable attention,26–28 but its cationic polymerization again produces low‐molecular‐weight polymers with low yields.…”

Section: Introductionmentioning

confidence: 99%

Studies on the modification of poly(ω‐bromoalkyl‐1‐glycidylether)s with 4′‐methoxybiphenyl‐4‐oxy mesogenic groups

Montornés¹,

Reina²,

Ronda³

2005

J. Polym. Sci. A Polym. Chem.

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A series of poly[ω‐(4′‐methoxy‐biphenyl‐4‐oxy)alkyl‐1‐glycidylether]s were synthesized by chemically modifying the corresponding poly(ω‐bromoalkyl‐1‐glycidylether)s with the sodium salt of 4‐hydroxy‐4′‐methoxybiphenyl. New high‐molecular‐weight side‐chain liquid‐crystalline polymers were obtained with excellent yields and almost quantitative degrees of modification. They were all insoluble in THF and other common solvents. Characterization by 13C NMR confirmed that all the polymers had the expected structure. The liquid crystalline behavior of the polymers was analyzed by DSC and polarized optical microscopy, and mesophase assignments were confirmed by X‐ray diffraction studies. Polymers that had alkyl spacers with n = 2 and 4 were smectic C, those that had spacers with n = 6 and 8 were nematic cybotactic, and those that had longer spacers (n = 10 and 12) were smectic C again. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5998–6006, 2005

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“…In the case of earlier reports on FSLCPs, the polymer backbones were of mainly poly(meth)acrylates − , or polysiloxanes. ,,,− Recently, a few research groups have utilized polyoxetane as a new type of backbone structure. − Although they reported the synthesis and the liquid crystallinity of some of the side-chain LCPs, systematic study on structure−property relationships of these new FSLCPs is still required. Furthermore, to our knowledge, only one investigation of side chain polyoxetanes exhibiting the chiral smectic C phase was reported by Hsu et al Surprisingly, their polymers showed relatively fast switching times in the range of microseconds (μs).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of New Chiral Side Chain Liquid Crystalline Polyoxetanes

Yun¹,

Ko²,

Jin³

et al. 2000

Macromolecules

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Two series of the side chain liquid crystalline polyoxetanes were synthesized via cationic ring-opening polymerization of oxetane monomers bearing pendant mesogenic units including two chiral carbons. The first two polymers have only one pendant group in the repeating unit, whereas the second polymers have two mesogenic groups per repeating unit. The oxetane monomer bearing one mesogenic unit produced high molecular weight polymers, whereas the ones bearing two mesogenic units at the same carbon in the ring produced only oligomeric products. Thermal and liquid crystalline properties of the polymers were investigated by optical polarizing microscopy, differential scanning calorimetry (DSC), and small-and wide-angle X-ray diffractometry. All of the polymers, with the exception of only one polymer, formed liquid crystalline phases such as S A, SC*, and SI* phases in melts. The molecular arrangement in the smectic phases was interpreted as an intercalated bilayer structure. An attempt to study the ferroelectric properties of the polymers was made, but the results obtained were not satisfactory.

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Synthesis of Liquid Crystalline Oligomeric Polyoxetanes with Two Mesogenic Groups in the Repeating Unit

Cited by 9 publications

References 18 publications

Ferroelectric liquid crystalline polyoxetanes bearing chiral dimesogenic pendants

Ferroelectric liquid crystalline polyoxetanes bearing chiral dimesogenic pendants

Studies on the modification of poly(ω‐bromoalkyl‐1‐glycidylether)s with 4′‐methoxybiphenyl‐4‐oxy mesogenic groups

Synthesis and Characterization of New Chiral Side Chain Liquid Crystalline Polyoxetanes

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