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

^*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: Dergiye katkı › Makale › bilirkişi

8 Atıf (Scopus)

Özet

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.

Orijinal dil	İngilizce
Sayfa (başlangıç-bitiş)	318-322
Sayfa sayısı	5
Dergi	Materials Chemistry and Physics
Hacim	78
Basın numarası	2
DOI'lar	https://doi.org/10.1016/S0254-0584(02)00300-0
Yayın durumu	Yayınlandı - 17 Şub 2003

Finansman

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.

Finansörler	Finansör numarası
TUBITAK	TBAG-1951, 100T074
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Consiglio Nazionale delle Ricerche
Istanbul Teknik Üniversitesi	1426, 1538

Belgeye Erişim

10.1016/S0254-0584(02)00300-0

Diğer Dosyalar ve Linkler

Link to publication in Scopus

Alıntı Yap

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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.",

keywords = "Critical exponent, Graft copolymer, Liquid crystal homopolymer, Nematic order, Photon transmission technique",

author = "Haluk {\"O}zbek and Sevtap Yildiz and {\"O}nder Pekcan and Ye{\c s}im Hepuzer and Yusuf Yagci and Giancarlo Galli",

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TY - JOUR

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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U2 - 10.1016/S0254-0584(02)00300-0

DO - 10.1016/S0254-0584(02)00300-0

M3 - Article

AN - SCOPUS:0037449985

SN - 0254-0584

VL - 78

SP - 318

EP - 322

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 2

ER -

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

Özet

Finansman

Belgeye Erişim

Diğer Dosyalar ve Linkler

Parmak izi

Alıntı Yap