Well-defined side-chain liquid-crystalline polysiloxanes

Mark A. Hempenius; Rob G.H. Lammertink; Gyula J. Vancso

doi:10.1002/marc.1996.030170503

Well-defined side-chain liquid-crystalline polysiloxanes

Mark A. Hempenius, Rob G.H. Lammertink, Gyula J. Vancso

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

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Abstract

A route to well-defined side-chain liquid-crystalline polysiloxanes (ratio of weight-to number-average molar masses Mw/Mn < 1.2 is reported. Anionic ring-opening polymerization of pentamethylvinylcyclotrisiloxane yielded a poly(dimethylsiloxane-co-methylvinylsiloxane) backbone. A flexible disiloxane spacer was used to connect 4-(ω-alkenyloxy)-4'-cyanobiphenyl mesogenic molecules to the vinyl groups which belong to the backbone, leading to a side-chain liquid-crystalline polysiloxane (SCLCP) which has its mesogens distributed regularly along the main chain. Preliminary measurements indicate an electro-optic switching time s = 1 min at 20°C and 7 s at 32°C (dc, 5 V/µm)).

Original language	Undefined
Pages (from-to)	299-303
Journal	Macromolecular rapid communications
Volume	17
Issue number	5
DOIs	https://doi.org/10.1002/marc.1996.030170503
Publication status	Published - 1996

Keywords

IR-71254
METIS-105777

Access to Document

10.1002/marc.1996.030170503

Hempenius96well

Cite this

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title = "Well-defined side-chain liquid-crystalline polysiloxanes",

abstract = "A route to well-defined side-chain liquid-crystalline polysiloxanes (ratio of weight-to number-average molar masses Mw/Mn < 1.2 is reported. Anionic ring-opening polymerization of pentamethylvinylcyclotrisiloxane yielded a poly(dimethylsiloxane-co-methylvinylsiloxane) backbone. A flexible disiloxane spacer was used to connect 4-(ω-alkenyloxy)-4'-cyanobiphenyl mesogenic molecules to the vinyl groups which belong to the backbone, leading to a side-chain liquid-crystalline polysiloxane (SCLCP) which has its mesogens distributed regularly along the main chain. Preliminary measurements indicate an electro-optic switching time s = 1 min at 20°C and 7 s at 32°C (dc, 5 V/µm)).",

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journal = "Macromolecular rapid communications",

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TY - JOUR

T1 - Well-defined side-chain liquid-crystalline polysiloxanes

AU - Hempenius, Mark A.

AU - Lammertink, Rob G.H.

AU - Vancso, Gyula J.

PY - 1996

Y1 - 1996

N2 - A route to well-defined side-chain liquid-crystalline polysiloxanes (ratio of weight-to number-average molar masses Mw/Mn < 1.2 is reported. Anionic ring-opening polymerization of pentamethylvinylcyclotrisiloxane yielded a poly(dimethylsiloxane-co-methylvinylsiloxane) backbone. A flexible disiloxane spacer was used to connect 4-(ω-alkenyloxy)-4'-cyanobiphenyl mesogenic molecules to the vinyl groups which belong to the backbone, leading to a side-chain liquid-crystalline polysiloxane (SCLCP) which has its mesogens distributed regularly along the main chain. Preliminary measurements indicate an electro-optic switching time s = 1 min at 20°C and 7 s at 32°C (dc, 5 V/µm)).

AB - A route to well-defined side-chain liquid-crystalline polysiloxanes (ratio of weight-to number-average molar masses Mw/Mn < 1.2 is reported. Anionic ring-opening polymerization of pentamethylvinylcyclotrisiloxane yielded a poly(dimethylsiloxane-co-methylvinylsiloxane) backbone. A flexible disiloxane spacer was used to connect 4-(ω-alkenyloxy)-4'-cyanobiphenyl mesogenic molecules to the vinyl groups which belong to the backbone, leading to a side-chain liquid-crystalline polysiloxane (SCLCP) which has its mesogens distributed regularly along the main chain. Preliminary measurements indicate an electro-optic switching time s = 1 min at 20°C and 7 s at 32°C (dc, 5 V/µm)).

KW - IR-71254

KW - METIS-105777

U2 - 10.1002/marc.1996.030170503

DO - 10.1002/marc.1996.030170503

M3 - Article

SN - 1022-1336

VL - 17

SP - 299

EP - 303

JO - Macromolecular rapid communications

JF - Macromolecular rapid communications

IS - 5

ER -