Piezoelectric poly(lactide) stereocomplexes with a cholinium organic ionic plastic crystal
authors Barbosa, P; Campos, J; Turygin, A; Shur, VY; Kholkin, A; Barros-Timmons, A; Figueiredo, FM
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY C
keywords MOLECULAR-WEIGHT POLYLACTIDE; DIHYDROGEN PHOSPHATE; LACTIC-ACID; LIQUIDS; FILMS; BEHAVIOR; PHASE
abstract This paper describes a novel method to produce poly(lactic acid) (PLA) stereocomplex (SC) crystallites directly from high molecular weight PLLA by incorporation of small quantities of choline dihydrogen phosphate ([Ch][DHP]), at room temperature. Combined results of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) confirm the formation of the PLA SC crystals. H-1 NMR spectroscopy indicates a modification of the short range structural environment of choline in the blend with PLA in good agreement with the major long-range structural changes suggested by XRD, both suggesting a direct role of the choline in the PLA stereocomplexation. The electrical conductivity of these membranes measured using impedance spectroscopy is in the 6 x 10(-7)-4 x 10(-6) S cm(-1) range, which increases with increasing choline content and with increasing relative humidity (RH). The dependence on RH is weaker than for pure PLA, thus suggesting that the SC enhances the hydrophobic character of PLA, in agreement with contact angle measurements. Atomic force microscopy (AFM) and piezoresponse force microscopy (PFM) reveal a new phase with piezoelectric properties at the microsphere interfaces, with d(33) corresponding to similar to 60% of d(33) of a periodically poled lithium niobate reference, which is directly related to the formation of SC crystalline domains. This first report of intrinsic piezoelectricity in PLA stereocomplexes opens the possibility for the development of new types of bio-based piezoactive polymers.
publisher ROYAL SOC CHEMISTRY
issn 2050-7526
year published 2017
volume 5
issue 46
beginning page 12134
ending page 12142
digital object identifier (doi) 10.1039/c7tc03484a
web of science category Materials Science, Multidisciplinary; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000416540600018
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journal impact factor (jcr 2016): 5.256
5 year journal impact factor (jcr 2016): 5.312
category normalized journal impact factor percentile (jcr 2016): 87.593
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