Variable-modulus material
US5486560A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1994 |
| Grant date | Jan 23, 1996 |
| Priority date | — |
| Expiry date | Oct 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B1/127
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A variable-modulus material is composed of a polymer whose constituent unit is a thiophene or pyrrole molecule having from one to three C.sub.4-12 alkyl side chains, or a copolymer whose constituent unit is the thiophene or pyrrole molecule and which includes in a main chain thereof a conjugated compound with a K-electron bond directly bonded to the above molecule, and at least one additive (in an amount of 0.5-20 wt % of said polymer) selected from halogens, protonic acids, and transition metal halides. It greatly decreases in modulus upon application of an electric field as low as 5-150 V/mm and restores its original modulus upon removal of the electric field. It is suitable for use as vibration dampers and shock absorbers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.