Abstract
The photopolymerization of two reactive mesogens with photopolymerizable acrylate endgroups, the methyl substituted 1,4-phenylene-bis{4-[6-(acryloyloxy) hexyloxy]benzoate} 1 and acrylic acid 6-{4-[6-(6-acryloy-loxyhexyloxy) naphthalen-2-yl]-phenoxy}hexyl ester 2 has been investigated using Photo-DSC measurements. Photocrosslinking of 1 in the nematic phase at 100°C leads to a final conversion of 87% of the acrylate groups. It is possible to perform photopolymerization with very small amounts of photoinitiator. Even with 0.001% (10 ppm) of photoinitiator, 47% of the acrylate groups polymerize within 15 min. The polymerization of the reactive mesogen 2 proceeds faster in the smectic A phase at 100°C compared to the isotropic phase at 120°C and leads to a higher conversion of 75%. This can be explained by an increased local concentration of the acrylate groups between the layers of the smectic cores.
Original language | English (US) |
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Pages (from-to) | 2153-2159 |
Number of pages | 7 |
Journal | Macromolecular Chemistry and Physics |
Volume | 206 |
Issue number | 21 |
DOIs | |
State | Published - Nov 1 2005 |
Externally published | Yes |
Keywords
- Acrylate
- Crosslinking
- Initiators
- Photopolymerization
- Reactive mesogens
ASJC Scopus subject areas
- Condensed Matter Physics
- Materials Chemistry
- Polymers and Plastics
- Physical and Theoretical Chemistry
- Organic Chemistry