Cure Monitoring of Bulk MDI - Based Polyurea-Polyurethane by In-Situ Emission Fluorescence.
Abstract
New generation RIM-PU incorporate both urea and urethane linkages in the backbone. Quantitative analysis of the complex mixture forced during fast curing process is a challenging task. Our approach is by intrinsic emission fluorescence. Bulk MDI-based RIM-PU resin contains urethane, urea, aromatic amine fluorphores dispersed in more than 87% of non-fluorescent PPO segments. Model compounds of urea, urethane and aromatic chromophore showed emission peaks at 303nm, 297nm and 333nm respectively. Non-linearity was observed for urea only. Fluorescence of the in-situ room temperature bulk curing resulted in two overlapped bands whose intensities changed as the curing proceeded while peak positions appeared at approximately the same range as predicted from model compounds. Curve fitting method was adopted to deconvolute these bands. Fluorescence intensities were correlated with extent of reaction calculated from FTIR data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 24, 1996
- Accession Number
- ADA311092
Entities
People
- Chong S. Sung
- Shi-kwun Wang
Organizations
- University of Connecticut