X-RAY-DIFFRACTION STUDY OF SIDE-ON FIXED HOMOPOLYSILOXANES FROM NEMATIC TO SMECTIC-C PHASES

被引：41

作者：

ACHARD, MF ^{[1
]}

LECOMMANDOUX, S ^{[1
]}

HARDOUIN, F ^{[1
]}

机构：

[1] UNIV BORDEAUX 1, CTR RECH PAUL PASCAL, F-33600 PESSAC, FRANCE

来源：

LIQUID CRYSTALS | 1995年 / 19卷 / 05期

关键词：

D O I：

10.1080/02678299508031071

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The X-ray patterns for the nematic phase in a series of side-on fixed polysiloxanes show different kinds of diffuse elements which imply complex short range ordering. A systematic structural study of the evolution of the patterns versus two molecular parameters, namely the spacer length and the length of the terminal aliphatic tails, suggests the possible occurrence of a smectic C phase for certain values of these parameters. Taking into account these tendencies, new synthesis led to a nematic-smectic C polymorphism observed for the first time in side-on fixed polysiloxanes.

引用

页码：581 / 587

页数：7

共 23 条

[11]

HESSEL F, 1987, MAKROMOL CHEM, V188, P1597

[12]

HESSEL F, 1985, POLYM BULL, V14, P375

[13]

HESSEL F, 1988, MAKROMOL CHEM, V189, P2275

[14]

HESSEL F, 1986, POLYM BULL, V15, P349

[15] UNUSUAL PROPERTY IN A NOVEL L-C SIDE-CHAIN POLYSILOXANE SERIES [J].

KELLER, P ;

HARDOUIN, F ;

MAUZAC, M ;

ACHARD, MF .

MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1988, 155 :171-178

[16]

LECONNANDOUX S, IN PRESS J PHYS

[17] SMALL-ANGLE NEUTRON-SCATTERING EXPERIMENTS ON SIDE-ON FIXED LIQUID-CRYSTAL POLYACRYLATES [J].

LEROUX, N ;

KELLER, P ;

ACHARD, MF ;

NOIREZ, L ;

HARDOUIN, F .

JOURNAL DE PHYSIQUE II, 1993, 3 (08) :1289-1296

[18]

LEUBE HF, 1990, MAKROMOL CHEM, V191, P2707

[19]

LEUBE HF, 1991, MAKROMOL CHEM, V192, P1314

[20]

PERCEC V, 1990, SIDE CHAIN LIQUID CR, P37

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