Influence of chain length of prepolymers in permanent memory effect of PDLC assessed by solid-state NMR

Ana Mouquinho; Marta C. Corvo; Pedro L. Almeida; Gabriel M. Feio; João Sotomayor

doi:10.1080/02678292.2019.1662105

Influence of chain length of prepolymers in permanent memory effect of PDLC assessed by solid-state NMR

Ana Mouquinho, Marta C. Corvo, Pedro L. Almeida, Gabriel M. Feio, João Sotomayor

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

4 Citations (Scopus)

Abstract

The relationship between linear chain (ethylene oxide units) length of polymerisable monomers with morphology, electro-optical properties and ¹³C nuclear magnetic resonance (NMR) spectroscopy of the corresponding polymer-dispersed liquid crystal (PDLC) films was investigated. The preferred liquid crystal molecule alignment and permanent memory effect of PDLC were greatly influenced by the length of the molecular chain of prepolymers to be incorporated as a polymer matrix. By increasing the number of ethylene oxide in prepolymer chain and maintaining the number of functionalities (polymerisable groups in each monomer molecule), the permanent memory effect of PDLC increased, as proved by solid-state ¹³C NMR spectroscopy.

Original language	English
Journal	Liquid Crystals
Volume	47
Issue number	4
Early online date	1 Sept 2019
DOIs	https://doi.org/10.1080/02678292.2019.1662105
Publication status	Published - 15 Mar 2020

Keywords

liquid crystals
memory devices
permanent memory effect
Polymer-dispersed liquid crystals

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10.1080/02678292.2019.1662105

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title = "Influence of chain length of prepolymers in permanent memory effect of PDLC assessed by solid-state NMR",

abstract = "The relationship between linear chain (ethylene oxide units) length of polymerisable monomers with morphology, electro-optical properties and 13C nuclear magnetic resonance (NMR) spectroscopy of the corresponding polymer-dispersed liquid crystal (PDLC) films was investigated. The preferred liquid crystal molecule alignment and permanent memory effect of PDLC were greatly influenced by the length of the molecular chain of prepolymers to be incorporated as a polymer matrix. By increasing the number of ethylene oxide in prepolymer chain and maintaining the number of functionalities (polymerisable groups in each monomer molecule), the permanent memory effect of PDLC increased, as proved by solid-state 13C NMR spectroscopy.",

keywords = "liquid crystals, memory devices, permanent memory effect, Polymer-dispersed liquid crystals",

author = "Ana Mouquinho and Corvo, {Marta C.} and Almeida, {Pedro L.} and Feio, {Gabriel M.} and Jo{\~a}o Sotomayor",

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doi = "10.1080/02678292.2019.1662105",

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T1 - Influence of chain length of prepolymers in permanent memory effect of PDLC assessed by solid-state NMR

AU - Mouquinho, Ana

AU - Corvo, Marta C.

AU - Almeida, Pedro L.

AU - Feio, Gabriel M.

AU - Sotomayor, João

N1 - info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F91870%2F2012/PT# info:eu-repo/grantAgreement/FCT/5876/147218/PT Foundation for Science and Technology (ROTEIRO/0031/2013, PINFRA/22161/2016). Projects number POCI-01-0145-FEDER-007688, Reference UID/CTM/50025/2019 and PTDC/FIS-NAN/0117/2014. PT2020 Partnership Agreement (POCI-01-0145-FEDER-007265). Sem PDF conforme despacho.

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N2 - The relationship between linear chain (ethylene oxide units) length of polymerisable monomers with morphology, electro-optical properties and 13C nuclear magnetic resonance (NMR) spectroscopy of the corresponding polymer-dispersed liquid crystal (PDLC) films was investigated. The preferred liquid crystal molecule alignment and permanent memory effect of PDLC were greatly influenced by the length of the molecular chain of prepolymers to be incorporated as a polymer matrix. By increasing the number of ethylene oxide in prepolymer chain and maintaining the number of functionalities (polymerisable groups in each monomer molecule), the permanent memory effect of PDLC increased, as proved by solid-state 13C NMR spectroscopy.

AB - The relationship between linear chain (ethylene oxide units) length of polymerisable monomers with morphology, electro-optical properties and 13C nuclear magnetic resonance (NMR) spectroscopy of the corresponding polymer-dispersed liquid crystal (PDLC) films was investigated. The preferred liquid crystal molecule alignment and permanent memory effect of PDLC were greatly influenced by the length of the molecular chain of prepolymers to be incorporated as a polymer matrix. By increasing the number of ethylene oxide in prepolymer chain and maintaining the number of functionalities (polymerisable groups in each monomer molecule), the permanent memory effect of PDLC increased, as proved by solid-state 13C NMR spectroscopy.

KW - liquid crystals

KW - memory devices

KW - permanent memory effect

KW - Polymer-dispersed liquid crystals

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DO - 10.1080/02678292.2019.1662105

M3 - Article

AN - SCOPUS:85073808276

SN - 0267-8292

VL - 47

JO - Liquid Crystals

JF - Liquid Crystals

IS - 4

ER -

Influence of chain length of prepolymers in permanent memory effect of PDLC assessed by solid-state NMR

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Keywords

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