Commodity Thermoplastics

Sastri, Vinny R.

doi:10.1016/b978-1-4557-3201-2.00006-9

Cited by 11 publications

(7 citation statements)

References 60 publications

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“…Deconvolution of the DSC curves showed that the obtained signals were a superposition of three or four peaks. The melting events in the DSC thermogram could be ascribed to the melting of the α and β phases present in the films [15,16,41]. The DSC peaks depended on the heating rate, and the appearance of the endotherms with different melting points was due to the reorganization of crystals on heating [39].…”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the sample with 0.1 wt % of rGO has different melting points of α and β-phases compared to other studied samples, while having the highest degree of crystallinity among imprinted, quenched samples and samples with 0.4 wt % of rGO. The imprinted samples do not reveal similar performance compared with the samples with 0.1 wt % of rGO since higher crystallinity and higher density provide such advantages as low moisture permeability and higher mechanical strength [41]. Due to higher crystallinity, the samples with 0.1 wt % of rGO have better chemical resistance, stiffness, and strength than imprinted, quenched samples and the ones with 0.4 wt % of rGO.…”

Section: Resultsmentioning

confidence: 99%

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Piezoelectric Response in Hybrid Micropillar Arrays of Poly(Vinylidene Fluoride) and Reduced Graphene Oxide

et al. 2019

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This study was dedicated to the investigation of poly(vinylidene fluoride) (PVDF) micropillar arrays obtained by soft lithography followed by phase inversion at a low temperature. Reduced graphene oxide (rGO) was incorporated into the PVDF as a nucleating filler. The piezoelectric properties of the PVDF-rGO composite micropillars were explored via piezo-response force microscopy (PFM). Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) showed that α, β, and γ phases co-existed in all studied samples, with a predominance of the γ phase. The piezoresponse force microscopy (PFM) data provided the local piezoelectric response of the PVDF micropillars, which exhibited a temperature-induced downward dipole orientation in the pristine PVDF micropillars. The addition of rGO into the PVDF matrix resulted in a change in the preferred polarization direction, and the piezo-response phase angle changed from −120° to 20°–40°. The pristine PVDF and PVDF loaded with 0.1 wt % of rGO after low-temperature quenching were found to possess a piezoelectric response of 86 and 87 pm/V respectively, which are significantly higher than the |d33eff| in the case of imprinted PVDF 64 pm/V. Thus, the addition of rGO significantly affected the domain orientation (polarization) while quenching increased the piezoelectric response.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Piezoelectric Response in Hybrid Micropillar Arrays of Poly(Vinylidene Fluoride) and Reduced Graphene Oxide

et al. 2019

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“…PS is known to have good resistance against hydrogen peroxide and is stable during sterilization via ethylene oxide and gamma radiation. 60 , 61 Indeed, under gamma radiation the high aromatic content of PS absorbs the radiation and eliminates the creation of reactive free radicals. 60 , 61 …”

Section: Resultsmentioning

confidence: 99%

“…PS was selected as the base polymer for our materials for its hydrophobicity, which should help maintain material stability upon exposure to liquid or in high humidity environments caused by respiration. 59 , 60 , 61 AgNPs were chosen as the means of incorporating biocidal properties into the PS filter given their easy integration into the precursor solution, low cost, and large surface area‐to‐volume ratio (which enhances silver's antimicrobial activity). 62 For Ag‐amended materials, AgNPs were integrated into the PS precursor solution at 2 and 10 wt% loadings (also with respect to total solution mass) prior to electrospinning, resulting in PS materials with 6 and 25 wt% Ag final loadings, respectively.…”

Section: Methodsmentioning

confidence: 99%

Simple fabrication of an electrospun polystyrene microfiber filter that meetsN95filtering facepiece respirator filtration and breathability standards

Jensen

O’Shaughnessy

Shaffer

et al. 2022

J of Applied Polymer Sci

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During the global spread of COVID‐19, high demand and limited availability of melt‐blown filtration material led to a manufacturing backlog of N95 Filtering Facepiece Respirators (FFRs). This shortfall prompted the search for alternative filter materials that could be quickly mass produced while meeting N95 FFR filtration and breathability performance standards. Here, an unsupported, nonwoven layer of uncharged polystyrene (PS) microfibers was produced via electrospinning that achieves N95 performance standards based on physical parameters (e.g., filter thickness) alone. PS microfibers 3–6 μm in diameter and deposited in an ~5 mm thick filter layer are favorable for use in FFRs, achieving high filtration efficiencies (≥97.5%) and low pressure drops (≤15 mm H2O). The PS microfiber filter demonstrates durability upon disinfection with hydroxyl radicals (•OH), maintaining high filtration efficiencies and low pressure drops over six rounds of disinfection. Additionally, the PS microfibers exhibit antibacterial activity (1‐log removal of E. coli) and can be modified readily through integration of silver nanoparticles (AgNPs) during electrospinning to enhance their activity (≥3‐log removal at 25 wt% AgNP integration). Because of their tunable performance, potential reusability with disinfection, and antimicrobial properties, these electrospun PS microfibers may represent a suitable, alternative filter material for use in N95 FFRs.

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“…Finally, MCF-7 cells were cultured on the dual-functional films. Since numerous biomedical devices are made of plastics (Czuba, 2014;Padsalgikar, 2017;Sastri, 2014a;Sastri, 2014b;Sastri, 2014c;Sastri, 2014d), the dual-functional coating was studied on poly(methylmethacrylate) (PMMA) slide substrates. The reasons behind the selection of PEOXA as the biopassive platform, and laminin as the bioactive compounds are available in our previous publications (Pidhatika et al, 2019a;Pidhatika et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

The preparation of dual-functional hydrogel as the surface coating of plastics in biomedical applications

Zhao¹,

Pidhatika²

2020

MKKP

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Poly(2-ethyl-2-oxazoline) (PEOXA) is among polymers that have been reported to show anti-adhesive (bio-passive) behavior in numerous biomaterial applications. This work aimed to develop dual-functional hydrogel coatings, with PEOXA as hydrophilic polymer and benzophenone as cross-linker. PEOXA was partially hydrolyzed in acidic conditions to form PEOXA-m% EI that contains ethyleneimine (EI) groups. The EI groups were used as conjugation sites for incorporation of benzophenone (BP) molecules to PEOXA chains to form PEOXA-m% EIBP. Thin films of surface-attached polymer networks were generated from PEOXA-m% EIBP copolymers composed of PEOXA as platform and benzophenone as crosslinker units. The polymer became crosslinked through benzophenone units and forms a hydrogel as biopassive platform during irradiation with ultraviolet (UV) light. Laminin was incorporated into biopassive polymer network to allow for preparation of dual-functional hydrogel. NMR spectra indicated successful control of PEOXA partial hydrolysis and conjugation of benzophenone molecules to PEOXA chains. Ellipsometry and ATR-FTIR results showed that wavelength of UV light during C, H-insertion reaction influences stability of polymer network (hydrogel) on the substrate surface. XPS spectra verified that a stable film could be generated using suitable UV light during preparation of polymer network. Cell culture study on laminin/PEOXA-coated PMAA plastics showed dual-functional properties.

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Commodity Thermoplastics

Cited by 11 publications

References 60 publications

Piezoelectric Response in Hybrid Micropillar Arrays of Poly(Vinylidene Fluoride) and Reduced Graphene Oxide

Piezoelectric Response in Hybrid Micropillar Arrays of Poly(Vinylidene Fluoride) and Reduced Graphene Oxide

Simple fabrication of an electrospun polystyrene microfiber filter that meetsN95filtering facepiece respirator filtration and breathability standards

The preparation of dual-functional hydrogel as the surface coating of plastics in biomedical applications

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