Accession Number : ADA311092

Title :   Cure Monitoring of Bulk MDI - Based Polyurea-Polyurethane by In-Situ Emission Fluorescence.

Descriptive Note : Technical rept. Jun 95-May 96,

Corporate Author : CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE

Personal Author(s) : Wang, Shi-Kwun ; Sung, Chong S.

PDF Url : ADA311092

Report Date : 24 JUN 1996

Pagination or Media Count : 8

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.

Descriptors :   *EMISSION, *FLUORESCENCE, *MONITORING, *POLYMERS, *BULK MATERIALS, *CURING, *UREA, *URETHANES, QUANTITATIVE ANALYSIS, INTENSITY, ROOM TEMPERATURE, MIXTURES, AMINES, POLYPROPYLENE, OXIDES, AROMATIC COMPOUNDS, POLYURETHANE RESINS, LINKAGES, INJECTION MOLDING, CURVE FITTING.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Plastics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE