In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 35, No. 11A ( 1996-11-01), p. L1442-
Abstract:
Ferroelectric behavior was observed in poly-L-lactic acid (PLLA), though its crystal structure was previously reported to be nonpolar because the molecular chains are helical. The remanent polarization ( P r ) increased with increasing temperature while the coercive electric field ( E c ) decreased. The remanent polarization and coercive electric field at 130° C were 96 mC/m 2 and 20 MV/m, respectively. Structural change upon application of an external electric field was observed by IR analysis, XRD and DSC measurements which suggested the possibility of polarization reversal in PLLA. The pyroelectric constant of a poled sample ( T p =130° C t p =5 min E p =50 MV/m) at room temperature was 10 µ C/m 2 ·K and became almost zero at the glass transition temperature, but increased again to 20 µ C/m 2 ·K at 85° C, and was stable up to 140° C.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.35.L1442
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1996
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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