POLYMERIC MOISTURE-SENSITIVE COMPOSITION FOR MOISTURE TRANSDUCER OF RESISTIVE TYPE Russian patent published in 1998 - IPC

FIELD: chemistry of high-molecular compounds. SUBSTANCE: moisture-sensitive compositions are prepared on the basis of polyamidoimide of the formula: with addition of polyethylene glycol as a moisture-sensitive substance at the following ratio, wt.-%: polyamidoimide of molecular mass (50-100) x 10³ Da 52.3-58.5, and polyethylene glycol of molecular mass 400-2000 Da 41.5-47.7. Transducers work at moisture range 15-99% and provide linear dependence of moisture absorption and conductivity at the broad temperature range - 0-85 C. Temperature and absolute errors of transducers are 0.3%/C and 2.0%, respectively, that is two-fold less as compared with the known analogs. These transducers are used in electronic industry, radioengineering, agriculture, energetics. EFFECT: enhanced quality of composition. 6 tbl, 2 dwg