Journal
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Volume 611, Issue 1, Pages 123-131Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15421406.2015.1030199
Keywords
permanent memory effect; polymeric network; anchorage force; PDLC; information storage
Funding
- Fundacao para a Ciencia e Tecnologia [PTDC/CTM-POL/122845/2010]
- Fundação para a Ciência e a Tecnologia [PTDC/CTM-POL/122845/2010] Funding Source: FCT
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Permanent memory effect in polymer dispersed liquid crystal (PDLC) films prepared by thermal polymerization induced phase separation (PIPS) were studied. New trimethylolpropane trimethacrylate (TMP3MA)/poly(propylene glycol) methacrylate (PPGMA375)/E7/AIBN and pentaerythritol tetraacrylate (PE4A)/poly(propylene glycol) acrylate (PPGA475)/E7/AIBN PDLC films showed 86% permanent memory effect with E90 = 6 V/mu m and memory state contrast of 70% and full permanent memory effect with E90 = 3 V/mu m and total memory state contrast, respectively. These materials with two stable states (opaque and transparent) seem to be promising for the development of a new class of optical memories as they can be used for electrically write information, optically read the written information and they can be thermally erased back to the initial scattered state.
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