Shear Piezoelectricity of Poly(<scp>l</scp>-lactide) Films Manufactured by Extrusion–Orientation: An Insight on Process–Structure–Property Relationships

Ben Achour, Mohamed Aymen; Barrau, Sophie; Tahon, Jean-François; Rguiti, Mohamed; Courtois, Christian; Stubbe, Birgit; Raquez, Jean-Marie; Lacrampe, Marie-France; Samuel, Cédric

doi:10.1021/acsapm.3c01419

Cited by 7 publications

(7 citation statements)

References 61 publications

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“…The signal of C(V−H−G) emerged at 0.03 Å −1 , which might be attributed to the PGMA side chains and the amorphous phase induced by the cross-linking inserted into the interlamellar amorphous phase with increasing intermolar distance. 16,24,50,51 The results were consistent with the FTIR results shown in Figure S2d.…”

Section: Resultssupporting

confidence: 89%

Cross-Linked Poly(vinylidene fluoride-hexafluoropropylene)-graft-poly(glycidyl methacrylate) Achieved Enhanced Dielectric Properties and Charge–Discharge Efficiency

Wang,

Cheng,

Wang

et al. 2024

ACS Appl. Polym. Mater.

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Poly(vinylidene fluoride) (PVDF)-based polymers are considered to be one of the most promising candidates for high-density capacitors. However, the practical application is limited by their low charge−discharge efficiency (η), which is ascribed to the high remnant polarization arising from the large hysteresis loss and conduction loss. In this work, we designed and prepared all-polymer-based dielectrics from cross-linking poly(vinylidene fluoride-hexafluoropropylene)-graft-poly(glycidyl methacrylate) (P(VDF-co-HFP)-g-PGMA, V−H−G) to address the issue. The bio-based amine of 2,5-bis(aminomethyl)furan (BAMF) was utilized to generate cross-linked networks through the amino-epoxy reaction. It demonstrated that the cross-linked structures, rich in polar groups and hydrogen bonding, could effectively tune the crystal properties and impede electrical conduction at high fields and elevated temperatures, resulting in restrained remnant polarization. An improved energy density of 7.39 J•cm −3 at 450 MV•m −1 for the cross-linked polymer was achieved, which was 648% of P(VDF-co-HFP) (V−H) (1.41 J•cm −3 at 300 MV•m −1 ) and 140% of V− H−G (5.18 J•cm −3 at 400 MV•m −1 ). Moreover, the η was significantly improved from 32% for V−H and 60% for V−H−G to 73.2% for the cross-linked polymer. Additional advantages of better dielectric properties at elevated temperatures compared with V−H and V−H−G were also observed. This work would provide inspiration for the design and preparation of high-performance polymer dielectrics.

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Section: Resultssupporting

confidence: 89%

Cross-Linked Poly(vinylidene fluoride-hexafluoropropylene)-graft-poly(glycidyl methacrylate) Achieved Enhanced Dielectric Properties and Charge–Discharge Efficiency

Wang,

Cheng,

Wang

et al. 2024

ACS Appl. Polym. Mater.

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“…0 r 1 was calculated with the dielectric constant (ε r ) of PLA (ε r = 3.5 49 ), dielectric constant of vacuum (ε 0 ), area of the capacitor surface (A 1 ), and thickness of capacitor (th). 2, revealed that the shear piezoelectric coefficient (d 14 ) of the cold-drawn PLA increased with the L-isomer content, which has been observed by Tajitsu 38 examining the upper range of optical purity from 99 to 99.99% and by Ben Achour et al 39 focusing on middle optical purities, such as 96 and 98%. Piezoelectric results revealed that PLA L99 with the highest optical purity has the highest piezoelectric coefficient.…”

Section: Piezoelectric Measurementsmentioning

confidence: 61%

“…Moreover, the decrease of optical purity from 99 to 92% of l -isomer content has been shown to accelerate the enzymatic degradation of PLLA films . This is due to the finding that D-PLA degrades, in general, faster than L-PLA, which is a great tool to tailor the degradation time of piezoelectric PLA implantable biodegradable pressure sensors or scaffolds for tissue regeneration …”

Section: Resultsmentioning

confidence: 99%

“…38 This is due to the finding that D-PLA degrades, in general, faster than L-PLA, which is a great tool to tailor the degradation time of piezoelectric PLA implantable biodegradable pressure sensors or scaffolds for tissue regeneration. 39 3.2. Effect of Postdrawn Annealing on Piezoelectricity and Chain Morphology.…”

Section: Piezoelectric Measurementsmentioning

confidence: 99%

“…Tajitsu 38 reported improved piezoelectric properties by increasing the optical purity of PLA from 99 to 99.99% L-isomer content, possessing similar crystal orientation and degree of crystallinity. Ben Achour et al 39 compared the piezoelectric properties of PLA with middlerange L-isomer content of 98 and 96%, varying the draw ratio, and reported different ideal draw ratios depending on the optical purity. However, to the best of the authors' knowledge, so far, no work has been reported that examines the effect of optical purity on the piezoelectric chain morphology, considering the degree of crystallinity, the lamellar thickness, and the chain orientation in the crystalline and amorphous region, while examining a wide range of PLA grades from very low to very high L-isomer content.…”

Section: Introductionmentioning

confidence: 99%

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The Combined Effects of Optical Purity, Chain Orientation, Crystallinity, and Dynamic Mechanical Activation as Means to Obtain Highly Piezoelectric Polylactide Materials

Schönlein,

Larrañaga,

Azkune

et al. 2024

ACS Appl. Polym. Mater.

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The shear piezoelectricity of polylactide (PLA) depends on the chain orientation, crystallinity, and optical purity, but their combined influence on the piezoelectric properties has never been studied. This work examines the effect of optical purity on the piezoelectric chain morphology induced by cold-drawing and heat treatment. Moreover, the influence of force and frequency during dynamic mechanical activation on the piezoelectric response of PLA was studied. The results of this work present for the first time a piezoelectric coefficient of a purely amorphous as-drawn PLA film (d 14 = 2.3 ± 0.1 pC N −1 ), exhibiting high optical purity and high chain orientation but without crystallites, leading to a ductile behavior. Postdrawn annealing increased the piezoelectric coefficient by 157% due to induced crystallinity and high crystal orientation, resulting in a brittle behavior. Upon increasing the optical purity from 88 to 99% L-isomer content, the piezoelectric coefficient (d 14 ) was shown to be improved due to the increased degree of crystallinity, chain orientation, and lamellar thickness. Dynamic mechanical analysis revealed for the first time a linear strain rate dependence of the piezoelectric response of PLA. This led to a further increase of the piezoelectric coefficient of the amorphous as-drawn film by 470% by increasing the frequency of dynamic mechanical activation to 1 kHz. These results unfold the potential for the fabrication of piezoelectric amorphous PLA films with improved ductility for final biomedical applications.

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Growth of molecular orientation during post‐process annealing of poly(lactic acid) containing a fibrous nucleating agent

Vo,

Yamaguchi

2024

J of Applied Polymer Sci

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Poly(lactic acid) (PLA) is known to exhibit slow crystallization. Therefore, post‐process annealing is often performed, at which structure change is inevitable. In this paper, the structure development during annealing of PLA containing N,N′‐ethylenebis(12‐hydroxystearamide) (EBHS) is studied using extruded strands. First, EBHS, which acts as a nucleating agent, is dissolved in molten PLA, and then segregates with a fibrous shape during cooling. Next, the PLA containing EBHS is extruded, which causes EBHS fibers in the strand to orientate with the flow direction. When the strand is annealed at 100°C, amorphous PLA chains initially lose their orientation. Then, the chain orientation in the PLA strand develops because of transcrystallization from the surface of EBHS fibers that are aligned with the flow direction. As a result, the Hermans orientation function increases from 1.8 × 10−3 (before annealing) to 6.0 × 10−3 (after annealing). Moreover, the annealed PLA/EBHS strand shows less shrinkage (0.80 ± 0.19%) than the annealed PLA strand (2.04 ± 0.27%). The promotion of PLA chain orientation induced by the presence of aligned EBHS fibers can be used to control the structure and dimensional change of PLA products during annealing.

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Shear Piezoelectricity of Poly(l-lactide) Films Manufactured by Extrusion–Orientation: An Insight on Process–Structure–Property Relationships

Cited by 7 publications

References 61 publications

Cross-Linked Poly(vinylidene fluoride-hexafluoropropylene)-graft-poly(glycidyl methacrylate) Achieved Enhanced Dielectric Properties and Charge–Discharge Efficiency

Cross-Linked Poly(vinylidene fluoride-hexafluoropropylene)-graft-poly(glycidyl methacrylate) Achieved Enhanced Dielectric Properties and Charge–Discharge Efficiency

The Combined Effects of Optical Purity, Chain Orientation, Crystallinity, and Dynamic Mechanical Activation as Means to Obtain Highly Piezoelectric Polylactide Materials

Growth of molecular orientation during post‐process annealing of poly(lactic acid) containing a fibrous nucleating agent

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