Electron Beam Irradiation of Nylon 66: Characterization by IR Spectroscopy and Viscosity Studies

Pramanik, Nilay; Alam, Manawwer; Kh, Rakesh Kumar

doi:10.15680/ijirset.2015.0401019

Cited by 12 publications

(3 citation statements)

References 16 publications

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“…To facilitate comparison, spectra were baseline-corrected to the value at 1800 cm –1 and normalized to the peak at ∼1660 cm –1 . We observed an increase in the ratio of amide II (C–N stretching) to amide I (CO stretching) to bands at ∼1540 and ∼1660 cm –1 , respectively. We attribute this difference to an overlap of the amide II group peak of nylon with benzenoid ring stretching of PANi at ∼1540 cm –1 .…”

Section: Resultsmentioning

confidence: 80%

Polyaniline-Functionalized Nanofibers for Colorimetric Detection of HCl Vapor

et al. 2018

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Hydrogen chloride (HCl) gas is a hazardous byproduct of industrial processes. Colorimetric approaches to facilitate portable and remote detection are especially desirable. We graft polyaniline to the surface of electrospun nylon nanofibers to minimize mass transfer. Using the resulting nanofibers, we demonstrate colorimetric detection of HCl at sub-ppm levels. We investigated the reusability of the fibers and observed a twofold increase in the limit of detection with multiple uses because of dedoping of the PANi indicated by elemental analysis. The limit of detection using visual detection was compared to spectrophotometric analysis. The Δ E from CIE LAB color space analysis via diffuse reflectance spectroscopy enhances the limit of detection by ∼fivefold when compared to visual detection. This analysis is a promising approach for remote detection using simple commercial digital cameras to achieve low limits of detection.

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Section: Resultsmentioning

confidence: 80%

Polyaniline-Functionalized Nanofibers for Colorimetric Detection of HCl Vapor

et al. 2018

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“…In the current approach, the sodium chloride core was in direct contact with the deposited fibers within the electric field. Attenuated total reflectance—Fourier transform infrared spectroscopy (ATR-FTIR) revealed similar spectral patterns with characteristic peaks related to N–H stretching at ~3330 cm −1 , CH 2 stretching at ~2840 cm −1 , amide I at ~1650 cm −1 , amide II at ~1545 cm −1 , and amide III at ~1370 cm −1 [ 15 , 17 ] ( Figure 4 a). A simultaneous TG/DTA investigation also suggested comparable heat flow patterns with a characteristic peak melting temperature ( T m ) at ~264.5 °C for pristine and ~262.5 °C for electrospun PA66, and decomposition patterns with the onset decomposition temperature of ~380 °C for pristine and ~373 °C for electrospun PA66 samples ( Figure 4 b,c).…”

Section: Resultsmentioning

confidence: 97%

Sacrificial Core-Based Electrospinning: A Facile and Versatile Approach to Fabricate Devices for Potential Cell and Tissue Encapsulation Applications

Kasoju

George

et al. 2018

Nanomaterials

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Electrospinning uses an electric field to produce fine fibers of nano and micron scale diameters from polymer solutions. Despite innovation in jet initiation, jet path control and fiber collection, it is common to only fabricate planar and tubular-shaped electrospun products. For applications that encapsulate cells and tissues inside a porous container, it is useful to develop biocompatible hollow core-containing devices. To this end, by introducing a 3D-printed framework containing a sodium chloride pellet (sacrificial core) as the collector and through post-electrospinning dissolution of the sacrificial core, we demonstrate that hollow core containing polyamide 66 (nylon 66) devices can be easily fabricated for use as cell encapsulation systems. ATR-FTIR and TG/DTA studies were used to verify that the bulk properties of the electrospun device were not altered by contact with the salt pellet during fiber collection. Protein diffusion investigations demonstrated that the capsule allowed free diffusion of model biomolecules (insulin, albumin and Ig G). Cell encapsulation studies with model cell types (fibroblasts and lymphocytes) revealed that the capsule supports the viability of encapsulated cells inside the capsule whilst compartmentalizing immune cells outside of the capsule. Taken together, the use of a salt pellet as a sacrificial core within a 3D printed framework to support fiber collection, as well as the ability to easily remove this core using aqueous dissolution, results in a biocompatible device that can be tailored for use in cell and tissue encapsulation applications.

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“…Graph showing the how the rates of polymer cross-linking and main chain scission interact to change the molecular weight of the polymer as electron dose is accumulated. Ultrahigh molecular weight polyethylene (UHMWPE) predominantly cross-links, while polytetrafluoroethylene (PTFE) degrades relatively quickly, and nylon-6,6 with its G (S): G (X) value close to one showing initial cross-linking and subsequent degradation with accumulating dose . UHMWPE data was adapted with permission from ref .…”

Section: Chemistry and Characterization Of E-beam Polymersmentioning

confidence: 99%

Liquid Phase Electron Microscopy Provides Opportunities in Polymer Synthesis and Manufacturing

Gibson

Patterson

2021

Macromolecules

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Liquid phase electron microscopy (LP-EM) is a rapidly developing method for imaging chemical processes in solution. A key strength of this method is that the high energy electrons can be used as both an energy and illumination source. This enables simultaneous control of the chemistry with nanoscale structural characterization. As electron beams are widely used in the manufacturing of polymeric materials, we believe that the knowledge obtained from LP-EM can directly guide industrial electron beam technologies, enabling the design, optimization, and manufacturing of nanostructured polymeric materials. In this Perspective, we outline the advances made in electron beam synthesis of polymeric materials and discuss the challenges and opportunities for utilizing LP-EM in conjunction with electron beam manufacturing technologies.

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Electron Beam Irradiation of Nylon 66: Characterization by IR Spectroscopy and Viscosity Studies

Cited by 12 publications

References 16 publications

Polyaniline-Functionalized Nanofibers for Colorimetric Detection of HCl Vapor

Polyaniline-Functionalized Nanofibers for Colorimetric Detection of HCl Vapor

Sacrificial Core-Based Electrospinning: A Facile and Versatile Approach to Fabricate Devices for Potential Cell and Tissue Encapsulation Applications

Liquid Phase Electron Microscopy Provides Opportunities in Polymer Synthesis and Manufacturing

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