Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 297, Issue 2, Pages 155-166Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201100108
Keywords
hyperbranched polymers; internal stress; nanocomposites; photopolymerization; sol; gel
Funding
- Swiss National Science Foundation (SNF) [200020-119780]
- Swiss National Science Foundation (SNF) [200020-119780] Funding Source: Swiss National Science Foundation (SNF)
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Nanocomposite materials based on a HBP and silica are produced using either a dual-cure sol/gel and photopolymerization process or by mixing silica nanoparticles with the HBP. In both cases the conversion of the HBP is independent of composition and obeys a time-intensity superposition with power-law dependence on UV intensity. Optimization of the dual-cure process leads to transparent sol/gel composites with ultrafine structures. These materials systematically outperform the particulate composites, including an increase of the glass transition temperature of 63 degrees C and a process-induced internal stress as low as 2.5MPa. Nano-sized gratings are produced from the sol/gel composites by low-pressure UV nanoimprint lithography.
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