TY - JOUR

T1 - Study of orientational order in thin films of disklike heptameric polycyclosiloxane molecules by means of the oblique-polarized-ray method

AU - Mikhaǐlova, N. A.

AU - Gubarev, A. S.

AU - Chizhova, N. V.

PY - 2005/1/1

Y1 - 2005/1/1

N2 - This paper uses the oblique-polarized-ray method to investigate birefringence in thin films of disklike heptameric polycyclosiloxane (HPCS). The surface birefringence B is determined at various temperatures. It is determined that B is independent of T in the region from room temperature to 40 °C, while B decreases to zero in absolute magnitude when the samples are heated further. A theoretical estimate is made of the polarizability anisotropy of HPCS molecules as Δ γ= - 450×10 -25 cm 3 . The orientational-ordering parameter of the HPCS molecules relative to the interphase boundaries is determined as <S>= -0.25. It is shown that the sixth-order symmetry axes of the HPCS molecules are oriented predominantly perpendicularly relative to the normal to the surface of the layer. A model is proposed for supermolecular structures, associated with the formation of domains in the form of stacks of predominantly parallel disklike HPCS molecules.

AB - This paper uses the oblique-polarized-ray method to investigate birefringence in thin films of disklike heptameric polycyclosiloxane (HPCS). The surface birefringence B is determined at various temperatures. It is determined that B is independent of T in the region from room temperature to 40 °C, while B decreases to zero in absolute magnitude when the samples are heated further. A theoretical estimate is made of the polarizability anisotropy of HPCS molecules as Δ γ= - 450×10 -25 cm 3 . The orientational-ordering parameter of the HPCS molecules relative to the interphase boundaries is determined as <S>= -0.25. It is shown that the sixth-order symmetry axes of the HPCS molecules are oriented predominantly perpendicularly relative to the normal to the surface of the layer. A model is proposed for supermolecular structures, associated with the formation of domains in the form of stacks of predominantly parallel disklike HPCS molecules.

UR - http://www.scopus.com/inward/record.url?scp=15944418171&partnerID=8YFLogxK

U2 - 10.1364/JOT.72.000015

DO - 10.1364/JOT.72.000015

M3 - Article

AN - SCOPUS:15944418171

VL - 72

SP - 15

EP - 19

JO - Journal of Optical Technology (A Translation of Opticheskii Zhurnal)

JF - Journal of Optical Technology (A Translation of Opticheskii Zhurnal)

SN - 1070-9762

IS - 1

ER -