Method and apparatus for determining extent of cure in polymers
US5596268A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1995 |
| Grant date | Jan 21, 1997 |
| Priority date | — |
| Expiry date | Jun 22, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0092
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for detecting extent of cross-linking of a high impedance polymer material during a pre-cure stage, the method comprising the steps of: PA1 a) applying a test signal through a sensor to the polymer material in the pre-cure stage to determine a level of impedance and corresponding sample voltage representative of a degree of cross-linking within the material; PA1 b) applying the same test signal through the sensor to a reference material having a fixed resistance to determine a reference voltage; PA1 c) determining a voltage difference between the test signal applied to the polymer at pre-cure stage and the test signal applied to the reference material as the reference voltage; PA1 d) correlating the voltage difference as a relative indicator of the extent of cross-linking which has occurred within the polymer material, based on comparison of magnitude of the voltage difference with respect to a comparable potential range of impedance for the polymer material from its lower impedance stage at minimal cross-linking to its high impedance stage at maximum impedance for total cross-linking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.