Influence of chain length of prepolymers in permanent memory effect of PDLC assessed by solid-state NMR |
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| Authors: | Ana Mouquinho Marta C Corvo Pedro L Almeida Gabriel M Feio |
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| Institution: | 1. REQUIMTE/LAQV, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal;2. CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal;3. área Departamental de Física, Instituto Superior de Engenharia de Lisboa, Lisboa, Portugal |
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| Abstract: | ABSTRACTThe 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. |
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| Keywords: | Polymer?-dispersed liquid crystals memory devices permanent memory effect liquid crystals |
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