Acoustic spectra of some polypropylene glycols. Rotational-isomer relaxation

Chuĭko, A. A.; Sperkach, V. S.; Оgenko, V. M.; Tantsyura, T.P.; Ganyuk, L. N.; Dubrovina, L. V.; Stribulevich, A. L.

doi:10.1016/0032-3950(91)90207-7

Cited by 3 publications

(2 citation statements)

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“…2 Recently we have preliminarily reported the layer-bylayer self-assembly of ultrathin films composed of 2.0 ( 0.5 nm thick layers of poly(diallyldimethylammonium chloride), PDDA, and exfoliated graphite oxide (GO) nanoplatelets 3 and of PDDA, GO, and poly(ethylene oxide) (PEO). 4 The demonstrated outstanding physical, chemical, and mechanical properties of polymer-GO composites 5,6 and the opportunity for controlling lateral conductivities and ion intercalation by the extent of graphite oxidation (to GO) and by the judicious organization of the selfassembled layers have prompted our work. The realization of the full potential of these films requires the more precise evaluation of the properties of the GO building blocks in a given environment.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Ultrathin Films Layer-by-Layer Self-Assembled from Graphite Oxide Nanoplatelets and Polymers

2000

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Graphite, oxidized by HNO3 and NaClO3 to 25% (GO-25), 42% (GO-42), and 33% (GO-33), has been dispersed to partially exfoliated nanoplatelets and, along with poly(diallyldimethylammonium chloride) (PDDA) and poly(ethylene oxide) (PEO), layer-by-layer self-assembled to ultrathin S-(PDDA/GO)10, S-PDDA/(GO/PEO)10, and S-(PDDA/GO/PEO)10 films (where S is the indium tin oxide-or chromium/ gold-coated glass or quartz substrate and GO refers to platelets of oxidized graphite). The GO powders have been characterized by X-ray diffraction prior and by transmission electron microscopy after their dispersions. Thicknesses of each of the successively adsorbed layers were comparatively determined by absorption spectrophotometry, surface plasmon resonance spectroscopy, quartz crystal microbalance, and scanning force microscopy. Good agreements were obtained by these three different techniques.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Ultrathin Films Layer-by-Layer Self-Assembled from Graphite Oxide Nanoplatelets and Polymers

2000

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“…24,25,26 Elastomers have the characteristics of both elastic solid and viscous fluid. Therefore, microscopic chains of elastomers always cause acoustic energy loss by internal friction and resonance 27,28 which are affected by temperature and pressure especially for underwater conditions. Underwater acoustic measurement methods have been developed to determine the absorption and transmission performance of polymers, and relevant test systems have been established.…”

Section: ⅰ Introductionmentioning

confidence: 99%

Mechanical and acoustic performance prediction model for elastomers in different environmental conditions

Huang

Oterkus

et al. 2018

The Journal of the Acoustical Society of America

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This study focuses on the constitutive model including temperature and pressure effects to investigate the dynamic, mechanical and acoustic properties of elastomers in frequency domain under different underwater conditions. The developed constitutive relation is based on Harvriliak-Negami (H-N) model by implementing experimental Young's modulus data and by using Williams-Landel-Ferry (WLF) shift function for relaxation time calculation. The H-N model accurately captures the dynamic mechanical modulus for wide range of frequencies for constant temperature and pressure based on measured DMTA (dynamic mechanical thermal analysis) data. Since the WLF shift function is related with the relaxation time for different temperatures and pressures, the proposed model represents a simple and accurate prediction of dynamic modulus for varying external conditions. Relationship between Young's modulus and acoustic properties of the rubber structure can be established by investigating the hydro-wave propagation process. The predictions from the proposed model are verified by comparing with mechanical and acoustic experimental data at different temperatures and pressures. Additionally, the parametric study is conducted to investigate the effect of H-N parameters on mechanical and acoustic properties of elastomer materials. The proposed model can be used to predict the mechanical and acoustic properties in different environmental conditions accurately.

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Acoustic spectra of some polypropylene glycols. mechanism of structural relaxation

Chuĭko¹,

Sperkach²,

Оgenko³

et al. 1991

Polymer Science U.S.S.R.

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Acoustic spectra of some polypropylene glycols. Rotational-isomer relaxation

Cited by 3 publications

References 1 publication

Preparation and Characterization of Ultrathin Films Layer-by-Layer Self-Assembled from Graphite Oxide Nanoplatelets and Polymers

Preparation and Characterization of Ultrathin Films Layer-by-Layer Self-Assembled from Graphite Oxide Nanoplatelets and Polymers

Mechanical and acoustic performance prediction model for elastomers in different environmental conditions

Acoustic spectra of some polypropylene glycols. mechanism of structural relaxation

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