Stretching-induced phase transitions in barium titanate-poly(vinylidene fluoride) flexible composite piezoelectric films

Khan, Fariha; Kowalchik, Tim; Roundy, Shad; Warren, Richard L.

doi:10.1016/j.scriptamat.2020.10.036

Cited by 42 publications

(23 citation statements)

References 22 publications

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“…It is known that filler reinforcement enhances the electroactive and mechanical properties of PVDF . In the present study, the incorporation of 20 wt % BT in PVDF induced the ∼52% electroactive β-phase with ∼2 GPa elastic stiffness (Figures d and c).…”

Section: Discussionsupporting

confidence: 56%

Functionalized Fluoropolymer-Compatibilized Elastomeric Bilayer Composites for Osteochondral Repair: Unraveling the Role of Substrate Stiffness and Functionalities

Panda

Basu

2021

ACS Appl. Bio Mater.

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The osteochondral lesions and osteoarthritis-related complications continue to be clinically relevant challenges to be addressed by the biomaterials community. Hydrogel-based scaffolds have been widely investigated to enhance osteochondral regeneration, but the inferior mechanical properties together with poor functional stability are the major constraints in their clinical translation. The development of osteochondral implants with natural tissue-mimicking mechanical properties remains largely unexplored. In this perspective, the present study demonstrates a strategy to develop a bilayer osteochondral implant with an elastically stiff composite (poly(vinylidene difluoride)-reinforced BaTiO3, PVDF/BT) and elastically compliant composite (maleic anhydride-functionalized PVDF/thermoplastic polyurethane/BaTiO3, m-PVDF/TPU/BT). The compositional variation in polymer composites allowed the elastic modulus of the hybrid bilayer construct to vary from ∼2 GPa to ∼90 MPa, which enabled a better understanding of the substrate-stiffness-dependent cellular behavior and maturation of preosteoblasts and chondrocytes. The cellular functionalities on PVDF-based polymer matrices have been benchmarked against ultrahigh-molecular-weight polyethylene (UHMWPE), which is clinically used for a wide spectrum of orthopedic applications. The increased alkaline phosphatase (ALP) activity, collagen synthesis, and matrix mineralization confirmed the early differentiation of preosteoblasts on the PVDF/BT matrix with subchondral bone-like mechanical properties. On the contrary, the upregulated chondrogenic functionalities were recorded on m-PVDF/TPU/BT with an elevated level of collagen content, glycosaminoglycans, and proteoglycans. Emphasis has been laid on probing the regulation of the osteochondral behavior using tailored substrate stiffness and functionalities using compatibilized fluoropolymer-based elastomeric composites. Taken together, the results of this work conclusively establish the efficacy of the hybrid bilayer composite with natural tissue-mimicking mechanical properties for the functional repair of osteochondral defects.

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Section: Discussionsupporting

confidence: 56%

Functionalized Fluoropolymer-Compatibilized Elastomeric Bilayer Composites for Osteochondral Repair: Unraveling the Role of Substrate Stiffness and Functionalities

Panda

Basu

2021

ACS Appl. Bio Mater.

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“…6. According to literature reports, [48][49][50] the obvious characteristic absorption peaks of the a phase are observed at 874 cm À1 , 1168 cm À1 and 1402 cm À1 , the absorption peaks of g phase appears at 812 cm À1 and 1231 cm À1 , and the absorption peaks of the b phase are seen at 839 cm À1 and 1431 cm À1 . These results suggest that the crystalline phase of neat PVDF is the coexistence of three phases.…”

Section: Crystal Phase Of Pvdf-based Nanocompositesmentioning

confidence: 82%

Concurrently enhanced dielectric properties and energy density in poly(vinylidene fluoride)-based core–shell BaTiO₃ nanocomposites via constructing a polar and rigid polymer interfacial layer

Tang¹,

Yu²,

Chen³

et al. 2022

J. Mater. Chem. C

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“…PVDF is endowed with high polarity, high dielectric constant, low crystallinity, good electrolyte wettability and chemical stability by the strong electron withdrawing group C-F. [58] Therefore, PVDF-based separators have attracted more and more attention and many related literatures have been reported in recent years. Lithiumion battery separators can be classified according to battery types (like liquid batteries and solid-state batteries), materials (like pure PVDF polymer, PVDF and inorganic material composite material, PVDF and organic material composite material), structures (like microporous separator, nonwoven separator) and other forms.…”

Section: Types Of Pvdf-based Separatorsmentioning

confidence: 99%

Poly(vinylidene fluoride) separators for next‐generation lithium based batteries

et al. 2021

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Lithium-ion batteries (LIBs) have become star products in wireless electronic equipment, new energy vehicles and many other fields due to their advantages of high energy density, light weight, good stability, high charging-discharging efficiency, long service life and environmental friendliness. The separator is an indispensable part of batteries that does not participate in electrochemical reactions, separating the anode and cathode. It has a microporous structure, which can store electrolyte and allow ions to transfer freely. Poly(vinylidene fluoride) (PVDF)-based separators are characterized by strong polarity, high dielectric constant, stable electrochemical performance, excellent tensile properties and mechanical strength, favorable thermal stability and wettability. Therefore, they are proposed to be potential candidates for novel separators in the field of LIBs. This review introduces the recent researches and advances in PVDF-based separators for LIBs, with the characterizations and requirements for separators. It is mainly divided into the two types including monolayer and multilayer separators. Furthermore, the performance of the PVDF-based separators is summarized, and the challenges and prospects in their practical application are briefly analyzed.

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Stretching-induced phase transitions in barium titanate-poly(vinylidene fluoride) flexible composite piezoelectric films

Cited by 42 publications

References 22 publications

Functionalized Fluoropolymer-Compatibilized Elastomeric Bilayer Composites for Osteochondral Repair: Unraveling the Role of Substrate Stiffness and Functionalities

Functionalized Fluoropolymer-Compatibilized Elastomeric Bilayer Composites for Osteochondral Repair: Unraveling the Role of Substrate Stiffness and Functionalities

Concurrently enhanced dielectric properties and energy density in poly(vinylidene fluoride)-based core–shell BaTiO₃ nanocomposites via constructing a polar and rigid polymer interfacial layer

Poly(vinylidene fluoride) separators for next‐generation lithium based batteries

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Stretching-induced phase transitions in barium titanate-poly(vinylidene fluoride) flexible composite piezoelectric films

Cited by 42 publications

References 22 publications

Functionalized Fluoropolymer-Compatibilized Elastomeric Bilayer Composites for Osteochondral Repair: Unraveling the Role of Substrate Stiffness and Functionalities

Functionalized Fluoropolymer-Compatibilized Elastomeric Bilayer Composites for Osteochondral Repair: Unraveling the Role of Substrate Stiffness and Functionalities

Concurrently enhanced dielectric properties and energy density in poly(vinylidene fluoride)-based core–shell BaTiO3 nanocomposites via constructing a polar and rigid polymer interfacial layer

Poly(vinylidene fluoride) separators for next‐generation lithium based batteries

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Concurrently enhanced dielectric properties and energy density in poly(vinylidene fluoride)-based core–shell BaTiO₃ nanocomposites via constructing a polar and rigid polymer interfacial layer