Multiscale characterization of semicrystalline polymeric materials by synchrotron radiation X‐ray and neutron scattering

Chen, Wei; Liu, Dong; Li, Liangbin

doi:10.1002/pcr2.10043

Cited by 15 publications

(5 citation statements)

References 115 publications

(185 reference statements)

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“…In this study, a shielding material dispersion technology that maximizes the particle–radiation interaction was investigated. When the dispersed particles interacted with incident radiation or when the transmitted energy was attenuated because of the high density of the shield, the intensity of the incident energy was attenuated 35 . This study was inspired by the structure of morpho butterfly wings and was performed with the expectation that the shielding effect would be higher than that of the existing sheet-type shield if the tungsten particles were dispersed inside the structure.…”

Section: Discussionmentioning

confidence: 99%

Development of ultra-thin radiation-shielding paper through nanofiber modeling of morpho butterfly wing structure

Kim

Byun

2022

Sci Rep

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In medical institutions, radiation shielding is an effective strategy to protect medical personnel and patients from exposure. Reducing the weight of the shield worn by medical personnel in the radiation generating area plays a key role in improving their productivity and mobility. In this study, a new lightweight radiation shield was developed by electrospinning a polymer-tungsten composite material to produce nanofibers with a multi-layered thin-film structure similar to that of a morpho butterfly wing. The fabricated shield was in the form of 0.1 mm thick flexible shielding paper. The multi-layer structure of the thin shielding paper was obtained through nanofiber pattern formation via electrospinning a dispersion of tungsten particles. At 0.1 mm thickness, the paper’s shielding rate was 64.88% at 60 keV. Furthermore, at 0.3 mm thick and arranged in a laminated structure, the shielding rate was 90.10% and the lead equivalent was 0.296 mmPb. When used as an apron material, the weight can be reduced by 45% compared to existing lead products. In addition, the material is highly processable and can be used to manufacture various flexible products, such as hats, gloves, underwear, and scarves used in medical institutions.

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Section: Discussionmentioning

confidence: 99%

Development of ultra-thin radiation-shielding paper through nanofiber modeling of morpho butterfly wing structure

Kim

Byun

2022

Sci Rep

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“…WAXS measurements were performed by an in-house set up with the help of an image plate detector (Mar 345, 3072 × 3072 pixels with a pixel size of 150 × 150 μm 2 ) attached to a micro Cu Kα X-ray source (Incoatec, GmbH, λ = 1.54 Å). All SAXS and WAXS patterns were collected within 15 min with a sample-to-detector of 2250 mm and 352 mm, respectively [37,38].…”

Section: Methodsmentioning

confidence: 99%

Preparation of Polyethylene and Ethylene/Methacrylic Acid Copolymer Blend Films with Tunable Surface Properties through Manipulating Processing Parameters during Film Blowing

Ali

Zhang

et al. 2019

Polymers

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Polymer films based on polyethylene (PE) and ionomer ethylene/methacrylic acid (EMAA) copolymer blend were prepared by film blowing, whose surface properties were tuned by varying processing parameters, i.e., take up ratio (TUR). Blends of PE/EMAA copolymer were firstly prepared by the melt-mixing method, before being further blown to films. The wettability of the film was investigated by measuring the contact angle/water-film encounter time, and optical properties, i.e., the haze and transmittance. The wettability was found to be enhanced with the increase of TUR. So too was the haze, while the transmittance was found to be almost independent of TUR. The XPS and AFM results directly show the increasing polar functional groups (–COO−) on the surface and roughness with increasing TUR. Further analysis of the 2D SAXS and WAXS unveiled the origin of the invariant transmittance, which resulted from the minor change of the crystallinity and the monotonic increase of the haze, with TUR resulting from the evolution of crystal orientation. In addition to other post-modification methods, the current study provides an alternative route to prepare large-scale PE films as the template for the advanced potential applications, i.e., covering in the layer of roof, the privacy of protective windows, and multitudes of packaging.

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“…Since the x-ray scattering can capture the long-range ordered structure and large-scale density fluctuation as mentioned above, the rheo x-ray scattering is crucial to obtain the structural feature of FIP. With the fast development of the synchrotron radiation facility, both high spatial and time-resolved x-ray scattering information can be obtained [129]. Su et al used micro-focus x-ray diffraction (μ-SRXD) with a spatial resolution of 4.9 × 5.3 μm 2 and time resolution of 5 s to investigate the precursor structure by fiber pulling [87,130].…”

Section: Flow-induced Precursormentioning

confidence: 99%

Polymer crystallization under external flow

Sheng¹,

Chen²,

Cui³

et al. 2022

Rep. Prog. Phys.

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The general aspects of polymer crystallization under external flow, i.e., flow-induced crystallization (FIC) from fundamental theoretical background to multi-scale characterization and modeling results are presented. FIC is crucial for modern polymer processing, such as blowing, casting, and injection modeling, as two-third of daily-used polymers is crystalline, and nearly all of them need to be processed before final applications. For academics, the FIC is intrinsically far from equilibrium, where the polymer crystallization behavior is different from that in quiescent conditions. The continuous investigation of crystallization contributes to a better understanding on the general non-equilibrium ordering in condensed physics. In the current review, the general theories related to polymer nucleation under flow (FIN) were summarized first as a preliminary knowledge. Various theories and models, i.e., coil-stretch transition and entropy reduction model, are briefly presented together with the modified versions. Subsequently, the multi-step ordering process of FIC is discussed in detail, including chain extension, conformational ordering, density fluctuation, and final perfection of the polymer crystalline. These achievements for a thorough understanding of the fundamental basis of FIC benefit from the development of various hyphenated rheometer, i.e., rheo-optical spectroscopy, rheo-IR, and rheo-X-ray scattering. The selected experimental results are introduced to present efforts on elucidating the multi-step and hierarchical structure transition during FIC. Then, the multi-scale modeling methods are summarized, including micro/meso scale simulation and macroscopic continuum modeling. At last, we briefly describe our personal opinions related to the future directions of this field, aiming to ultimately establish the unified theory of FIC and promote building of the more applicable models in the polymer processing.

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Multiscale characterization of semicrystalline polymeric materials by synchrotron radiation X‐ray and neutron scattering

Cited by 15 publications

References 115 publications

Development of ultra-thin radiation-shielding paper through nanofiber modeling of morpho butterfly wing structure

Development of ultra-thin radiation-shielding paper through nanofiber modeling of morpho butterfly wing structure

Preparation of Polyethylene and Ethylene/Methacrylic Acid Copolymer Blend Films with Tunable Surface Properties through Manipulating Processing Parameters during Film Blowing

Polymer crystallization under external flow

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