Comparative study of liquid-crystalline ordering in a monomer, linear polymer, and graft copolymer by the photon transmission technique

Haluk Özbek; Sevtap Yildiz; Önder Pekcan; Yeşim Hepuzer; Yusuf Yaǧci; A. Nihat Berker; Giancarlo Galli; Emo Chiellini

doi:10.1080/0141159031000156454

Comparative study of liquid-crystalline ordering in a monomer, linear polymer, and graft copolymer by the photon transmission technique

Haluk Özbek, Sevtap Yildiz, Önder Pekcan^*, Yeşim Hepuzer, Yusuf Yaǧci, A. Nihat Berker, Giancarlo Galli, Emo Chiellini

^*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name??? › Makale › bilirkişi

4 Atıf (Scopus)

Özet

The photon transmission technique was used to study the phase transitions of a liquid crystalline acrylate monomer, 6-(4-cyanobiphenyl-4′oxy)hexyl acrylate (LC6), its homopolymer (PLC6) and its graft copolymer (GLC6) with polytetrahydrofuran grafts. The phase transitions were also confirmed by DSC and polarizing microscopy. We observed the phase transition sequence isotropic-nematic-smectic A-smectic C in the LC6 monomer. In PLC6 and GLC6 polymers, the nematic and smectic A phases appear dominant. The apparent nematic-smectic A transition is of first order in PLC6 and of second order in GLC6, with the transition temperature remaining the same. The effects of quenched random constraints introduced in GLC6 are consistent with the theory of quenched random interactions. The critical exponents were also evaluated.

Orijinal dil	İngilizce
Sayfa (başlangıç-bitiş)	991-998
Sayfa sayısı	8
Dergi	Phase Transitions
Hacim	76
Basın numarası	12
DOI'lar	https://doi.org/10.1080/0141159031000156454
Yayın durumu	Yayınlandı - 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 Ista_ nbul Technical University, Grant No. 1426 and 1538. This work was performed with partial financial support from the Turkish TÜBITAK and the Italian CNR.

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

Belgeye Erişim

10.1080/0141159031000156454

Diğer Dosyalar ve Linkler

Link to publication in Scopus

Alıntı Yap

@article{1026191041b740f1ad08dbd89273d554,

title = "Comparative study of liquid-crystalline ordering in a monomer, linear polymer, and graft copolymer by the photon transmission technique",

abstract = "The photon transmission technique was used to study the phase transitions of a liquid crystalline acrylate monomer, 6-(4-cyanobiphenyl-4′oxy)hexyl acrylate (LC6), its homopolymer (PLC6) and its graft copolymer (GLC6) with polytetrahydrofuran grafts. The phase transitions were also confirmed by DSC and polarizing microscopy. We observed the phase transition sequence isotropic-nematic-smectic A-smectic C in the LC6 monomer. In PLC6 and GLC6 polymers, the nematic and smectic A phases appear dominant. The apparent nematic-smectic A transition is of first order in PLC6 and of second order in GLC6, with the transition temperature remaining the same. The effects of quenched random constraints introduced in GLC6 are consistent with the theory of quenched random interactions. The critical exponents were also evaluated.",

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

author = "Haluk {\"O}zbek and Sevtap Yildiz and {\"O}nder Pekcan and Ye{\c s}im Hepuzer and Yusuf Yaǧci and Berker, {A. Nihat} and Giancarlo Galli and Emo Chiellini",

year = "2003",

doi = "10.1080/0141159031000156454",

language = "English",

volume = "76",

pages = "991--998",

journal = "Phase Transitions",

issn = "0141-1594",

publisher = "Taylor and Francis Ltd.",

number = "12",

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TY - JOUR

T1 - Comparative study of liquid-crystalline ordering in a monomer, linear polymer, and graft copolymer by the photon transmission technique

AU - Özbek, Haluk

AU - Yildiz, Sevtap

AU - Pekcan, Önder

AU - Hepuzer, Yeşim

AU - Yaǧci, Yusuf

AU - Berker, A. Nihat

AU - Galli, Giancarlo

AU - Chiellini, Emo

PY - 2003

Y1 - 2003

N2 - The photon transmission technique was used to study the phase transitions of a liquid crystalline acrylate monomer, 6-(4-cyanobiphenyl-4′oxy)hexyl acrylate (LC6), its homopolymer (PLC6) and its graft copolymer (GLC6) with polytetrahydrofuran grafts. The phase transitions were also confirmed by DSC and polarizing microscopy. We observed the phase transition sequence isotropic-nematic-smectic A-smectic C in the LC6 monomer. In PLC6 and GLC6 polymers, the nematic and smectic A phases appear dominant. The apparent nematic-smectic A transition is of first order in PLC6 and of second order in GLC6, with the transition temperature remaining the same. The effects of quenched random constraints introduced in GLC6 are consistent with the theory of quenched random interactions. The critical exponents were also evaluated.

AB - The photon transmission technique was used to study the phase transitions of a liquid crystalline acrylate monomer, 6-(4-cyanobiphenyl-4′oxy)hexyl acrylate (LC6), its homopolymer (PLC6) and its graft copolymer (GLC6) with polytetrahydrofuran grafts. The phase transitions were also confirmed by DSC and polarizing microscopy. We observed the phase transition sequence isotropic-nematic-smectic A-smectic C in the LC6 monomer. In PLC6 and GLC6 polymers, the nematic and smectic A phases appear dominant. The apparent nematic-smectic A transition is of first order in PLC6 and of second order in GLC6, with the transition temperature remaining the same. The effects of quenched random constraints introduced in GLC6 are consistent with the theory of quenched random interactions. The critical exponents were also evaluated.

KW - Critical exponent

KW - Graft copolymer

KW - Liquid crystal homopolymer

KW - Nematic order

KW - Photon transmission technique

KW - Quenched random constraints

UR - http://www.scopus.com/inward/record.url?scp=21244459549&partnerID=8YFLogxK

U2 - 10.1080/0141159031000156454

DO - 10.1080/0141159031000156454

M3 - Article

AN - SCOPUS:21244459549

SN - 0141-1594

VL - 76

SP - 991

EP - 998

JO - Phase Transitions

JF - Phase Transitions

IS - 12

ER -

Comparative study of liquid-crystalline ordering in a monomer, linear polymer, and graft copolymer by the photon transmission technique

Özet

Finansman

Belgeye Erişim

Diğer Dosyalar ve Linkler

Parmak izi

Alıntı Yap