The effects of nano-sized carbon fillers on the physico-chemical, mechanical, and biological properties of polyester nanocomposites

Staniszewski, Zygmunt; Sobolewski, Peter; Piegat, Agnieszka; Fray, Mirosława El

doi:10.1016/j.eurpolymj.2018.08.012

Cited by 12 publications

(13 citation statements)

References 22 publications

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“…The polymer matrix of the studied nanocomposites consisted of multi-block thermoplastic elastomer consisting of hard segments of poly(ethylene terephthalate) (PET) and soft segments of amorphous fatty acid ester sequences based on di-linoleic acid (DLA). The synthesis of both neat [27], copyright 2018, Elsevier); (b) graphene nanocomposite pneumatic membrane (calipers provided for scale).…”

Section: Graphene Nanocomposite Preparation and Characterizationmentioning

confidence: 99%

“…Both the copolymer matrix and the nanocomposites were developed within the scope of the ElastoKard project in partnership with the Professor Zbigniew Religa Foundation of Cardiac Surgery Development (FRK) to serve as construction materials for extracorporeal heart assist devices in the context of the Polish Artificial Heart Program [25]. We have recently reported the kiloscale (suitable for Research and Development and prototyping) in-situ polymerization synthesis of these materials and their full physicochemical, thermal, and mechanical characterization [26,27]. These co-polymers and nanocomposites have been successfully used to produce prototype extracorporeal heart assist devices (Figure 1a), including the important hemispherical pneumatic membrane composed of the graphene nanocomposite ( Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

“…This THz characterization approach measures and utilizes both the real and the imaginary parts of the dielectric function (or, equivalently, the index of refraction) for both the neat copolymers and graphene nanocomposites, as well as the amount of THz radiation absorbed as the THz probe beam propagates through the sample. [27], copyright 2018, Elsevier); (b) graphene nanocomposite pneumatic membrane (calipers provided for scale).…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Time-Domain Spectroscopy of Graphene Nanoflakes Embedded in Polymer Matrix

et al. 2019

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The terahertz time-domain spectroscopy (THz-TDS) technique has been used to obtain transmission THz-radiation spectra of polymer nanocomposites containing a controlled amount of exfoliated graphene. Graphene nanocomposites (1 wt%) that were used in this work were based on poly(ethylene terephthalate-ethylene dilinoleate) (PET-DLA) matrix and were prepared via a kilo-scale (suitable for research and development, and prototyping) in-situ polymerization. This was followed by compression molding into 0.3-mm-thick and 0.9-mm-thick foils. Transmission electron microscopy (TEM) and Raman studies were used to confirm that the graphene nanoflakes dispersed in a polymer matrix consisted of a few-layer graphene. The THz-radiation transients were generated and detected using a low-temperature–grown GaAs photoconductive emitter and detector, both excited by 100-fs-wide, 800-nm-wavelength optical pulses, generated at a 76-MHz repetition rate by a Ti:Sapphire laser. Time-domain signals transmitted through the nitrogen, neat polymer reference, and 1-wt% graphene-polymer nanocomposite samples were recorded and subsequently converted into the spectral domain by means of a fast Fourier transformation. The spectral range of our spectrometer was up to 4 THz, and measurements were taken at room temperature in a dry nitrogen environment. We collected a family of spectra and, based on Fresnel equations, performed a numerical analysis, that allowed us to extract the THz-frequency-range refractive index and absorption coefficient and their dependences on the sample composition and graphene content. Using the Clausius-Mossotti relation, we also managed to estimate the graphene effective dielectric constant to be equal to ~7 ± 2. Finally, we extracted from our experimental data complex conductivity spectra of graphene nanocomposites and successfully fitted them to the Drude-Smith model, demonstrating that our graphene nanoflakes were isolated in their polymer matrix and exhibited highly localized electron backscattering with a femtosecond relaxation time. Our results shed new light on how the incorporation of exfoliated graphene nanoflakes modifies polymer electrical properties in the THz-frequency range. Importantly, they demonstrate that the complex conductivity analysis is a very efficient, macroscopic and non-destructive (contrary to TEM) tool for the characterization of the dispersion of a graphene nanofiller within a copolyester matrix.

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Section: Graphene Nanocomposite Preparation and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Terahertz Time-Domain Spectroscopy of Graphene Nanoflakes Embedded in Polymer Matrix

et al. 2019

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“…The chemical structure of PET-DLA copolymer containing 40 wt.% of hard segments of ethylene terephthalate and 60 wt.% of ethylene dilinoleate is shown in Figure 9. Detailed characterization of the PET-DLA copolymer can be found in our previous work [42], e.g., differential scanning calorimetry (DSC): Tm = 166.2 °C, Tg = −19.1 °C, degree of crystallinity of hard segments, Xc = 8%.…”

Section: Polymer For Drug Encapsulationmentioning

confidence: 99%

“…Finally, the stirring was reduced to 400 rpm and the chloroform was removed by evaporation over 24 h in a fume hood at room temperature, while protected from exposure to light. After evaporation of the solvent, the resulting microspheres were centrifuged (2500 - Detailed characterization of the PET-DLA copolymer can be found in our previous work [42], e.g., differential scanning calorimetry (DSC): T m = 166.2 • C, T g = −19.1 • C, degree of crystallinity of hard segments, X c = 8%.…”

Section: Preparation Of Microspheresmentioning

confidence: 99%

Double-Emulsion Copolyester Microcapsules for Sustained Intraperitoneal Release of Carboplatin

Cymbaluk‐Płoska

Sobolewski

Chudecka‐Głaz

et al. 2019

JFB

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Despite on-going medical advances, ovarian cancer survival rates have stagnated. In order to improve IP delivery of platinum-based antineoplastics, we aimed to develop a sustained drug delivery system for carboplatin (CPt). Toward this aim, we pursued a double emulsion process for obtaining CPt-loaded microcapsules composed of poly(ethylene terephthalate-ethylene dilinoleate) (PET-DLA) copolymer. We were able to obtain PET-DLA microspheres in the targeted size range of 10–25 µm (median: 18.5 µm), to reduce intraperitoneal clearance by phagocytosis and lymphoid transit. Empty microspheres showed the lack of toxicity in vitro. The double emulsion process yielded 2.5% w/w CPt loading and obtained microcapsules exhibited sustained (>20 day) zero-order release. The encapsulated CPt was confirmed to be bioavailable, as the microcapsules demonstrated efficacy against human ovarian adenocarcinoma (SK-OV-3) cells in vitro. Following intraperitoneal injection in mice, we did not observe adhesions, only mild, clinically-insignificant, local inflammatory response. Tissue platinum levels, monitored over 14 days using atomic absorption spectroscopy, revealed low burst and reduced systemic uptake (plasma, kidney), as compared to neat carboplatin injection. Overall, the results demonstrate the potential of the developed microencapsulation system for long-term intraperitoneal sustained release of carboplatin for the treatment of ovarian cancer.

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Synthesis and characterization of barium titanate nanoplatelets/polyvinylidene fluoride nanocomposite for piezoelectric properties

Aldulaimi,

Pircheraghi,

Nemati

2024

Polymer Composites

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Barium titanate (BaTiO3) nanostructures with a tetragonal structure have unique mechanical and piezoelectric properties. BaTiO3 nanoplatelets (BTNPs) were synthesized via the precipitation of the hydroxide (Ba‐Ti‐OH) precursor, which was subsequently subjected to hydrothermal treatment. Polyvinylidene fluoride (PVDF) granules and BTNPs powder were compounded through melt‐mixing within a laboratory internal mixer to PVDF/BTNP nanocomposite. The dispersion of BTNPs were analyzed using FE‐SEM images. The examination of the polycrystalline structure of a PVDF/BTNP nanocomposite involved the utilization of FTIR, DSC, and XRD measurements. Further, the tensile test was carried out to study the mechanical properties of the nanocomposites. The piezoelectric tests showed that the PVDF nanocomposite with 10 wt.% of BTNP exhibited the highest output voltage and current due to its maximum crystallinity. The measured current increased from 0.03 μA for PVDF to 0.22 μA for PVDF/BTNP nanocomposite and further to 0.34 after polling. PVDF's piezoelectric properties experienced an 11‐fold enhancement due to alterations in its crystalline structure. Power density improved by 644% (7.5 times), and piezoelectric sensitivity rose by 173%. Consequently, the PVDF/BTNP nanocomposite demonstrates significant potential for applications in electronics and energy harvesting.Highlights Unique Tetragonal nanoplatelets produced via controlled BTNP synthesis. 10% BTNP enhances nanocomposite crystallinity by 22.7% PVDF‐10 displays increase in both voltage and current, enhancing piezoelectricity. Nanocomposites show promise for energy and electronics.

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The effects of nano-sized carbon fillers on the physico-chemical, mechanical, and biological properties of polyester nanocomposites

Cited by 12 publications

References 22 publications

Terahertz Time-Domain Spectroscopy of Graphene Nanoflakes Embedded in Polymer Matrix

Terahertz Time-Domain Spectroscopy of Graphene Nanoflakes Embedded in Polymer Matrix

Double-Emulsion Copolyester Microcapsules for Sustained Intraperitoneal Release of Carboplatin

Synthesis and characterization of barium titanate nanoplatelets/polyvinylidene fluoride nanocomposite for piezoelectric properties

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