Polymeric piezoelectric material
First Claim
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1. A polymeric piezoelectric material comprising a polylactic acid molded article having been uniaxially drawn to an extent causing no fibrillation.
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Abstract
A polymeric piezoelectric material including a polylactic acid molded article having been uniaxially drawn to an extent causing no fibrillation. The piezoelectric material exhibits piezoelectric properties equal to or higher than those of electret type or polypeptide type piezoelectric materials while having high enough mechanical strength to be processed into various articles ranging from films to profiles depending on the end use.
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Citations
19 Claims
- 1. A polymeric piezoelectric material comprising a polylactic acid molded article having been uniaxially drawn to an extent causing no fibrillation.
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17. A method for treating a fractured bone, comprising
(A) forming a polymeric piezoelectric material comprising a polylactic acid film having been uniaxially drawn to an extent causing no fibrillation, wherein the film has a piezoelectric constant -d'"'"'14 of from 8 to 13 pC/N and a piezoelectric constant -e'"'"'14 of from 10 to 20 mC/m2, and wherein the film has (a) an axial direction which connects two ends of the film which are to be fixed and (b) a drawing direction, and the drawing direction forms an angle other than 90° - with the axial direction, and
(B) applying the film to a bone having a fracture part, with said two ends of the film which are to be fixed being fixed near the fractured part for acceleration of ossification.
- with the axial direction, and
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18. A method of using a polymeric piezoelectric material, comprising using said material as a piezoelectric element of an ultrasonic transducer of an ultrasonographic device,
wherein the material comprises a polylactic acid molded article having been uniaxially drawn to an extent causing no fibrillation, wherein the polylactic acid molded article has a piezoelectric constant -d'"'"'14 of from 8 to 13 pC/N and a piezoelectric constant -e'"'"'14 of from 10 to 20 mC/m2, and wherein the polylactic acid molded article has (a) a thickness direction and (b) a drawing direction, and the drawing direction forms an angle other than 90° - with the thickness direction.
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19. A method of using a polymeric piezoelectric material, comprising using said material as a piezoelectric element of an ultrasonic probe of an ultrasonic flaw detector,
wherein the material comprises a polylactic acid molded article having been uniaxially drawn to an extent causing no fibrillation, wherein the polylactic acid molded article has a piezoelectric constant -d'"'"'14 of from 8 to 13 pC/N and a piezoelectric constant -e'"'"'14 of from 10 to 20 mC/m2, and wherein the polylactic acid molded article has (a) a thickness direction and (b) a drawing direction, and the drawing direction forms an angle other than 90° - with the thickness direction.
Specification