Coatings based on polyurethane chemistry. Concept of hard clusters in the interpretation of properties of polyurethane and polyurethane acrylate networks
- Laboratoire des Materiaux Macromoleculaires-URA CNRS n507, I.N.S.A. LYON, 20 Avenue Albert Einstein, 69621 Villeurbanne Cedex (France)
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 16206 Prague 6 (Czech Republic)
Polyurethane (PU) and polyurethane acrylate (PUA) networks based on hydroxyl-terminated poycaprolactone (PCL), m-tetramethylene diisocyanate (m-TMXDI), trimethylolpropane (TMP) for PU or hydroxyethyl methacrylate (HEMA) for PUA, have been synthesized with various molar masses of PCL, various molar ratios and consequently with various crosslink densities. PUA can be considered as one-component systems. Even when thermodynamics driven segregation does not occur, the distribution of crosslinks in networks is topologically non uniform. The concept of hard cluster crosslinks, which are represented by structures of chemically {l_angle}{l_angle}hard{r_angle}{r_angle} units: diisocyanate linked to TMP in the case of PU networks, and microgel-like polymerized polyacrylate chains in the case of PUA networks, is very useful to explain Tg and equilibrium modulus variations. {copyright} {ital 1996 American Institute of Physics.}
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 288909
- Report Number(s):
- CONF-950119--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 354; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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