Mesomomorphism enhancement of modified side‐chain liquid‐crystalline polysiloxanes by copolymerization

Sun, Qiu-Ju; Zhang, Baoyan; Jia, Ying‐Gang; Yang, Lu

doi:10.1002/app.21861

Cited by 3 publications

(2 citation statements)

References 12 publications

(7 reference statements)

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“…T g is an important parameter with respect to the structure and property of a polymer. In general, the T g value is strongly influenced by the chain flexibility and molecular weight of the polymer and the length of the spacer group 9, 25. By comparing the DSC results of this work with the results of our previous work [ T g of polymethyl(phenethenyl)siloxane was −45°C, and T g of polymethyl(phenethyl)siloxane was −50°C],3, 4 we found that T g increased.…”

Section: Resultssupporting

confidence: 58%

“…Numerous works have been devoted to the modification of PMHS via hydrosilylation in the presence of platinum hydrochloric acid and different platinum complexes 3–11. Acidic Speier's catalyst cannot be used for all hydrosilylation reactions because it causes isomerization of the allylic bond followed by acidic cleavage of the functional group and, in some cases, gelation of the reaction mixture, even during the process of addition.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of polysiloxanes with pendant methoxy‐substituted aromatic fragments

Mukbaniani

Titvinidze

Dundua

et al. 2007

J of Applied Polymer Sci

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The synthesis of new polysiloxanes was performed via hydrosilylation reactions of polymethylhydrosiloxane with 4-allyl-1-methoxybenzene and 4-allyl-1,2-dimethoxybenzene in the presence of Karstedt's catalyst {Pt 2 [(VinSiMe 2 ) 2 O] 3 } and platinum hydrochloric acid (0.1M solution in tetrahydrofuran). The hydrosilylation reactions were carried out at 608C. The molar ratio of BSiÀ ÀH groups to the allylic compound was 1 : 1.2. The synthesized oligomers were characterized with 1 H-NMR, Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetry, and gel permeation chromatography. In the presence of platinum hydrochloric acid, not all active BSiÀ ÀH bonds took part in hydrosilylation, and because of this, gelation took place and the molecular masses of the extracted parts increased 7-8 times; in contrast to this, in the presence of Karstedt's catalyst, all active BSiÀ ÀH bonds participated in hydrosilylation, and an increase in the molecular masses did not occurs. The influence of substituted methoxy groups on the glass-transition temperatures was studied.

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Section: Resultssupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Synthesis of polysiloxanes with pendant methoxy‐substituted aromatic fragments

Mukbaniani

Titvinidze

Dundua

et al. 2007

J of Applied Polymer Sci

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Morphology and Mechanical Properties of Ternary Polymer Blends Containing Liquid Crystalline Ionomers with Different Ionic Group

Zhou

2015

AMM

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Three side-chain liquid crystalline ionomers (SLCIs) with sulfonic group (SLCI-S), quaternary ammonium salt group (SLCI-N), and carboxylic group (SLCI-C) were synthesized by graft copolymerization upon polymethylhydrosiloxane, respectively. The SLCIs were used to blend with poly (butylene terephthalate) (PBT) and polypropylene (PP). The morphological structure and mechanical properties of the blends were investigated by scanning electron microscopy (SEM). SEM results indicated that the addition of SLCIs lead to finer and better dispersion of PP polymer in the blends relative to the blends with no SLCIs added. The compatibilization of SLCIs in the blends were in the increasing order of SLCI-S> SLCI-N> SLCI-C, which was due to the specify interaction between SLCIs and PBT increased with the increasing order of SLCI-S>SLCI-N>SLCI-C. The mechanical properties were improved when the proper amount of SLCI was added, which enabled improve adhesion at the interface. The mechanical property of PBT/PP/SLCI-S was higher than that of PBT/PP/SLCI-N, which was higher than that of PBT/PP/SLCI-C.

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Cholesteric Cyclohexane-Containing Side-Chain Liquid-Crystalline Polysiloxanes

Zhang

Chang

2014

MSF

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Two new kinds of Cholesteric cyclohexane-Containing Side-Chain Liquid-Crystalline Polysiloxanes (PAand PB) were synthesized via hydrosilylation reaction of polymethyl hydrogen siloxane with cyclohexane mesogenic monomers (MAand MB). The yield of PA, PBwere 71.6%, 82.5% and 81.0%, respectively. The molecular structures of MAand MB, PAand PBwere investigated by Fourier transform infrared spectroscopy (FTIR) and hydrogen-nuclear magnetic resonance spectra (1H-NMR). The corresponding liquid crystalline phase type was also observed by polarizing optical microscopy (POM) and X-ray diffraction (XRD). The liquid crystalline phase behavior and thermal properties of the polymers were analyzed by differential scanning calorimetry (DSC). Results showed that MAand MBexhibited multicolor platelet texture of a blue phase and cholesteric phase, and the Tmand Tiof MAand MBincreased with the increasing flexible chain length. The mesophase temperature range of PAand PBwas broader than that of MAand MB. PAexhibited a rare nematic phase----spherulite texture of polymeric smectic A phase. PBwere of cholesteric and nematic---- cholesteric phase. The Tmand Tiof PAand PBincreased with the increasing flexible spacer groups.

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Mesomomorphism enhancement of modified side‐chain liquid‐crystalline polysiloxanes by copolymerization

Cited by 3 publications

References 12 publications

Synthesis of polysiloxanes with pendant methoxy‐substituted aromatic fragments

Synthesis of polysiloxanes with pendant methoxy‐substituted aromatic fragments

Morphology and Mechanical Properties of Ternary Polymer Blends Containing Liquid Crystalline Ionomers with Different Ionic Group

Cholesteric Cyclohexane-Containing Side-Chain Liquid-Crystalline Polysiloxanes

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