Intrinsic Fluorescence Cure Sensor for Reaction Monitoring in Polyurethane

reportActive / Technical Report | Accession Number: ADA281215 | Open PDF

Abstract:

Fluorescence spectroscopy and UV absorption were used as main tools to monitor the reaction of methylene diphenyl-4-4-diisocyanate MDI with 1- butanol, polypropylene oxide PPO and diethyl toluene diamine, DETDA using the curing agent MDI as a chemical and spectroscopic sensor. The MDI virtually has no fluorescence, but shows strong fluorescence emission at about 310 nm after changing into urethane. The emission of DETDA appears at 343 nm which is about the same wavelength as that of the urea formed. However, the urea shows higher fluorescence quantum yield. The fluorescence intensity changes were applied to monitor the polymerization process. FTIR was used to obtain the extent of reaction by following the disappearance of the isocyanate group. Correlation curves between the fluorescence intensity changes and IR results were derived making the fluorescence changes applicable in the estimation of the extent of reaction. Intrinsic fluorescence, Methylene Diphenyl Diisocyanate MDI, Polyurea, polyurethane, Butane diol, Diethyl toluene diamine.

Author(s):
Sun, Xiang-dong ; Sung, Chong S.
Author Organization(s):
CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE
Descriptive Note:
Technical rept. Jun 1993-May 1994
Pagination:
0004

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-38-ONR
Contract/Grant Number(s):
N00014-89-J-1145
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_3.2.1_Kinetic Means; JCA_6.3.3_Spectrum Management; JCA_1.2.3_Educating
Modernization Areas:
Quantum Science and Computing
Communities of Interest:
Sensors
Descriptor(s):
*DETECTORS, *FLUORESCENCE, *CHEMICAL REACTIONS, *URETHANES, *CURING, *METHYLENES, EMISSION, SPECTROSCOPY, TOOLS, CHEMICALS, POLYMERIZATION, MONITORS, BUTANOLS, TOLUENES, UREA, BUTANES, ISOCYANATES, ETHYL RADICALS, CURING AGENTS, ABSORPTION, YIELD, INTENSITY, AMINES, CORRELATION, PROPENES, OXIDES, ULTRAVIOLET SPECTROSCOPY
Field(s)/Group(s):
Organic Chemistry, Physical Chemistry, Polymer Chemistry, Optics
Keyword(s):
*INTRINSIC, *POLYURETHANES, MDI(METHYLENE DIPHENYL 4 4 DIISOCYANATE), DIOLS
Report Date:
1994 Jun 01