Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1993-08-30
1995-04-18
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324300, G01R 3320
Patent
active
054081815
ABSTRACT:
A pulsed nmr analysis system for polymers materials extracted from industrial processes at a mobility enhancing temperature (at or above glass transition temperature for amorphous polymers, at the crystalline transition temperature for crystalline and semi-crystalline polymers). The sample is measured via nmr techniques and results correlated to viscosity and melt index or melt flow (which are related to average molecular weights). The nmr system (in or out of resonance) includes: sample throughput system (P, LI, V1, V2) and user system controls (104) to establish digitized free induction decay curves (C), from which components functions are determined using linear or non-linear regression techniques to correlate the curve components to the target nuclei and to flow rates in plastics. Substantial improvement of correlation of nmr derived constants and equations of a free induction decay curve with the foregoing polymer properties is obtained via (1) conducting the nmr process at a mobility enhancing temperature (normally elevated compared to the industrial process temperature of the industrial process) and (2) holding temperature substantially constant at such elevated temperature.
REFERENCES:
patent: 2864995 (1958-12-01), Shoolery
patent: 3621378 (1971-11-01), Kleiman
patent: 4254373 (1981-03-01), Lippmaa et al.
patent: 4266194 (1981-05-01), Hlavka
patent: 4489275 (1984-12-01), Sancier et al.
patent: 4587492 (1986-05-01), Landermilch
patent: 4940942 (1990-07-01), Bartuska et al.
patent: 5015954 (1991-05-01), Dechene et al.
patent: 5049819 (1991-09-01), Dechene et al.
patent: 5122745 (1992-06-01), Smith et al.
patent: 5192910 (1993-03-01), Hepp et al.
patent: 5300888 (1994-04-01), Webster et al.
patent: 5302896 (1994-04-01), Dechene et al.
patent: 5321358 (1994-06-01), Mohr et al.
Day David R.
Dechene Ronald L.
Marino Scott A.
Roy Ajoy K.
Smith Thomas B.
Auburn International, Inc.
Cohen Jerry
Mah Raymond Y.
O'Shea Sandra L.
Paul Edwin H.
LandOfFree
NMR system for measuring polymer properties does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with NMR system for measuring polymer properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NMR system for measuring polymer properties will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-68774