Liquid crystalline and photoactive poly[4,4′-stilbeneoxy]alkylbiphenylphosphates

Ravikrishnan, A.; Sudhakara, P.; Kannan, P.

doi:10.1016/j.polymdegradstab.2008.05.017

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…3). Such texture has been reported by Ster [29], Balamurugan and Ravikrishnan [30][31][32], and from henceforth it will be referred to as M. The mesophase M appears in all the ionic liquid crystal compounds in this paper. The second peak in the thermogram is at 158.8 8C corresponding to LCI-LCII transition peak, a fan-shape texture (Fig.…”

Section: Liquid Crystalline Propertiessupporting

confidence: 64%

Pyridinium-based ionic liquid crystals with terminal fluorinated pyrrolidine

Tao

Zhong

Liu

et al. 2012

Journal of Fluorine Chemistry

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Section: Liquid Crystalline Propertiessupporting

confidence: 64%

Pyridinium-based ionic liquid crystals with terminal fluorinated pyrrolidine

Tao

Zhong

Liu

et al. 2012

Journal of Fluorine Chemistry

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“…The increase of ionic groups in the polymers tends to change the glass transition temperatures (T g ) and clear point a little. The effect of 2 spacer length on LC properties is well reported [14][15][16][17][18]. It is found that with an increase in the number of methylene units in the side chains of the polymers, there is an increase in the layer spacing values for the cholesteric liquid crystalline phases as measured by WAXD.…”

Section: Introductionmentioning

confidence: 68%

Phase transition behavior of silicone based liquid crystalline polymers

Jana¹,

Bhunia

Im³

2011

E-Polymers

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Phase transition behavior of silicone based liquid crystalline (LC) polymers with variable isotropic transition temperatures (T i ), synthesized from poly(methyl hydrosiloxane), 10-undecenoic acid based crosslinking agent and cholesterol based side chain mesogen, was studied by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD) measurements. The chemical structure of the mesogenic monomer and the LC polymers were confirmed by Fourier transform infra-red (FT-IR) spectroscopy and 1 HNMR spectroscopy. DSC studies showed that the glass transition temperatures (T g ) and T i of the LC polymers decreased with increasing proportion of mesogenic crosslinking agent at its low proportion and at its higher proportion T i disappeared completely indicating that the polymeric chains had less chance to orient in the network structure. The results were consistent with the XRD and POM studies.

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“…Literature survey revealed that incorporation of phosphate group into polymer backbone improved their solubility, thermo‐oxidative stability, char yield, flame retardancy and also results in low T g [24–33]. In continuation of our research [34–36] in this domain, the present work describes the synthesis and characterization of liquid crystalline and photocrosslinkable polyarylphosphates containing 4,4′‐bis( m ‐alkyloxy)stilbene moiety and detailed comparative study on the effect of pendant aryl substitution on their physical properties.…”

Section: Introductionmentioning

confidence: 86%

Liquid crystalline and photocrosslinkable poly(4,4′‐stilbeneoxy) alkylarylphosphates

Ravikrishnan

Sudhakara

Kannan

2011

Polymer Engineering & Sci

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Three series of liquid crystalline and photocrosslinkable poly(4,4 0 -stilbeneoxy) alkylarylphosphates were synthesized from various 4,4 0 -bis(m-hydroxyalkyloxy)stilbenes (m ¼ 2, 4, 6, 8, 10) and arylphosphorodichloridates in chloroform by solution polycondensation method. Polarized optical microscope (POM) and differential scanning calorimetry (DSC) observations revealed that polymers containing less than four methylene spacer groups did not exhibit liquid crystalline (LC) texture, possibly due to smaller microdomain and restricted movement of the mesogen. In contrast, polymers containing more than four methylene spacer group established LC texture, which has been attributed to the larger monodomain and free movement of mesogens. Thermogravimetric analysis (TGA) data indicated that thermal stability and char yield decreased with increasing flexible methylene spacer groups, increased significantly for biphenyloxy and 1naphthyloxy containing polymers than that of phenyloxy containing polymers ascribed to increasing aromaticity, size, and number of aromatic rings. Photocrosslinking of stilbene containing polymers has been shown to proceed via 2p-2p cycloaddition reaction by Ultra-violet (UV) and fluorescence. The rate photocrosslinking has been found to increase with increasing number of methylene group in the main chain. The aromaticity of the side chain also increases the rate of crosslinking. POLYM. ENG. SCI., 52:598-606, 2012. ª 2011 Society of Plastics Engineers EXPERIMENTAL MaterialsBromoacetaldehyde diethylacetal, 2-chloroethanol, 4-chloro-1-butanol, 1,6-hexane diol, 1,8-octane diol,

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Liquid crystalline and photoactive poly[4,4′-stilbeneoxy]alkylbiphenylphosphates

Cited by 15 publications

References 30 publications

Pyridinium-based ionic liquid crystals with terminal fluorinated pyrrolidine

Pyridinium-based ionic liquid crystals with terminal fluorinated pyrrolidine

Phase transition behavior of silicone based liquid crystalline polymers

Liquid crystalline and photocrosslinkable poly(4,4′‐stilbeneoxy) alkylarylphosphates

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