Study of phase transitions in liquid crystalline side group polymers via photon transmission method

Haluk Özbek; Sevtap Yildiz; Önder Pekcan; Yeşim Hepuzer; Yusuf Yagci; Giancarlo Galli

doi:10.1016/S0254-0584(02)00300-0

Study of phase transitions in liquid crystalline side group polymers via photon transmission method

Haluk Özbek, Sevtap Yildiz, Önder Pekcan^*, Yeşim Hepuzer, Yusuf Yagci, Giancarlo Galli

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Photon transmission measurements were applied to study the phase transitions of an acrylate monomer, 3-(4-cyanobiphenyl-4′-oxy)propyl acrylate (LC3), its homopolymer (PLC3) and its graft copolymer (GLC3) with polytetrahydrofuran grafts. In PLC3 drastic decrease in the transmitted light intensity was attributed to a first-order isotropic-nematic phase transition. The phase transitions were also confirmed by DSC and polarizing microscopy. No phase transition was observed in GLC3. This method was not able to detect the isotropic-nematic phase transition in GLC3, probably because of the small size of the phase separated domains in this graft copolymer. The isotropic-nematic transition of GLC3 was identified by polarizing microscopy only by the appearance of a weak diffuse birefringence on cooling.

Original language	English
Pages (from-to)	318-322
Number of pages	5
Journal	Materials Chemistry and Physics
Volume	78
Issue number	2
DOIs	https://doi.org/10.1016/S0254-0584(02)00300-0
Publication status	Published - 17 Feb 2003

Funding

This work was supported by The Scientific and Technological Research Council of Turkey (TUBITAK) under Grant No. TBAG-1951 (100T074), and the Research Fund of Istanbul Technical University, Grant Nos. 1426 and 1538. Partial financial support from the TUBITAK BDP program and the Italian CNR is also gratefully acknowledged.

Funders	Funder number
TUBITAK	TBAG-1951, 100T074
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Consiglio Nazionale delle Ricerche
Istanbul Teknik Üniversitesi	1426, 1538

Keywords

Critical exponent
Graft copolymer
Liquid crystal homopolymer
Nematic order
Photon transmission technique

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10.1016/S0254-0584(02)00300-0

Cite this

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title = "Study of phase transitions in liquid crystalline side group polymers via photon transmission method",

abstract = "Photon transmission measurements were applied to study the phase transitions of an acrylate monomer, 3-(4-cyanobiphenyl-4′-oxy)propyl acrylate (LC3), its homopolymer (PLC3) and its graft copolymer (GLC3) with polytetrahydrofuran grafts. In PLC3 drastic decrease in the transmitted light intensity was attributed to a first-order isotropic-nematic phase transition. The phase transitions were also confirmed by DSC and polarizing microscopy. No phase transition was observed in GLC3. This method was not able to detect the isotropic-nematic phase transition in GLC3, probably because of the small size of the phase separated domains in this graft copolymer. The isotropic-nematic transition of GLC3 was identified by polarizing microscopy only by the appearance of a weak diffuse birefringence on cooling.",

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T1 - Study of phase transitions in liquid crystalline side group polymers via photon transmission method

AU - Özbek, Haluk

AU - Yildiz, Sevtap

AU - Pekcan, Önder

AU - Hepuzer, Yeşim

AU - Yagci, Yusuf

AU - Galli, Giancarlo

PY - 2003/2/17

Y1 - 2003/2/17

N2 - Photon transmission measurements were applied to study the phase transitions of an acrylate monomer, 3-(4-cyanobiphenyl-4′-oxy)propyl acrylate (LC3), its homopolymer (PLC3) and its graft copolymer (GLC3) with polytetrahydrofuran grafts. In PLC3 drastic decrease in the transmitted light intensity was attributed to a first-order isotropic-nematic phase transition. The phase transitions were also confirmed by DSC and polarizing microscopy. No phase transition was observed in GLC3. This method was not able to detect the isotropic-nematic phase transition in GLC3, probably because of the small size of the phase separated domains in this graft copolymer. The isotropic-nematic transition of GLC3 was identified by polarizing microscopy only by the appearance of a weak diffuse birefringence on cooling.

AB - Photon transmission measurements were applied to study the phase transitions of an acrylate monomer, 3-(4-cyanobiphenyl-4′-oxy)propyl acrylate (LC3), its homopolymer (PLC3) and its graft copolymer (GLC3) with polytetrahydrofuran grafts. In PLC3 drastic decrease in the transmitted light intensity was attributed to a first-order isotropic-nematic phase transition. The phase transitions were also confirmed by DSC and polarizing microscopy. No phase transition was observed in GLC3. This method was not able to detect the isotropic-nematic phase transition in GLC3, probably because of the small size of the phase separated domains in this graft copolymer. The isotropic-nematic transition of GLC3 was identified by polarizing microscopy only by the appearance of a weak diffuse birefringence on cooling.

KW - Critical exponent

KW - Graft copolymer

KW - Liquid crystal homopolymer

KW - Nematic order

KW - Photon transmission technique

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JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

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ER -

Study of phase transitions in liquid crystalline side group polymers via photon transmission method

Abstract

Funding

Keywords

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