Θετικές

Currently, piezo-electric materials which generate electricity with mechanical strain, are drawing attention as energy-harvesting materials in tyres. Major piezoelectric materials are ceramics and polymers, but they have some deficits which prevent them from wide prevalence.
Piezo-electric ceramics are used for restricted purposes because of their fragility and heavy weight, although they generate relatively high electricity. On the other hand, piezoelectric polymers generate very slight electricity although they achieve flexibility by reducing the thickness.