The study on compressive mechanical properties of rigid polyurethane grout materials with different densities

Liu, Kai; Liang, Wei; Ren, Fengmei; Ren, Jingge; Wang, Fang; Ding, Hui

doi:10.1016/j.conbuildmat.2019.02.012

Cited by 67 publications

(25 citation statements)

References 31 publications

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“…The content of HFC‐365mfc affects the density of polyurethane foams. The density of polyurethane foam has been one of the most important properties to consider in LNG storage tank engineering, and is used in the design, analysis, and evaluation, as it has a large effect on thermal conductivity and strength . To measure density, the polyurethane foam was cut into 50 × 50 × 50 mm rectangular parallelepiped shapes (ASTM D 1622) .…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Polyurethane Foam Considering Mixture Blowing Agents for Application to Cryogenic Environments

Son

Kim

Choi

et al. 2019

Macro Materials & Eng

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Polyurethane foams, which are among the most widely used insulating materials, are generally fabricated by the chemical reaction between isocyanate and polyol‐containing chemical additives and blowing agents. Recently, many kinds of blowing agents have been used for the fabrication process of polyurethane foam, such as hydrochlorofluorocarbons (HCFCs) and chlorofluorocarbons (CFCs). However, issues have continuously arisen regarding the destruction of the ozone layer due to these compounds. In the present study, polyurethane foams are manufactured using a mixture of water blowing agents and hydrofluorocarbons (HFC‐365mfc). These samples are subjected to mechanical tests to investigate the effects of the blowing agents on the mechanical properties of the polyurethane foam within a temperature range of 25 to −163 °C. In addition, thermal and microstructural investigations are conducted depending on the content of the HFC‐365mfc. From the scanning electron microscopy observations, the sizes of the structure cells and the windows are found to decrease with the increase in HFC‐365mfc content. In addition, from the Fourier transform‐infrared spectroscopy observations, the chemical bonds that affect mechanical performance are found to be more distributed with the increase in HFC‐365mfc content.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Polyurethane Foam Considering Mixture Blowing Agents for Application to Cryogenic Environments

Son

Kim

Choi

et al. 2019

Macro Materials & Eng

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“…It can be seen that struts play a major supporting role. Under load, struts will buckle and faces will crack [13].…”

Section: Microstructure Of Polymersmentioning

confidence: 99%

“…e authors of [11][12][13][14] studied the stressstrain behavior, microstructure characteristics, fatigue behaviour, and failure mode of RPU grouting materials under uniaxial compression, dynamic compression, and cyclic loading. Studies have shown that RPU grout materials with different densities show elastoplastic or atypical brittle characteristic; the main mechanical properties increase with increasing of density.…”

Section: Introductionmentioning

confidence: 99%

Statistical Characteristics of Polymer Grouting Material Microstructure

Wang

Fang

et al. 2020

Advances in Civil Engineering

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The two-component foaming polyurethane is a kind of grouting material that has recently been widely used in engineering structural repair. Its physical and mechanical properties are closely related to its microstructure. Therefore, the qualitative and quantitative analysis of polymer microstructure has always been a research hotspot. The statistical characteristics of polymer grouting material microstructure are investigated by six groups of specimens with different densities, and the density varies from 0.1 to 0.6 g/cm3. The microstructure morphology of polymer was observed and described by scanning electron microscopy (SEM), and the microstructure feature parameters were extracted and calculated by image processing technology. The quantitative analysis of section cell roundness distribution, cell diameter distribution, and polymer porosity shows that low-density polymer materials have anisotropy. While the density exceeds 0.3 g/cm3, the cell structure tends to be spherical. The section cell diameters obey a normal distribution, and when the density increases, the cell diameter decreases. The porosity of the polymer has a linear negative correlation with the density. The polymer matrix has a density of 1.21 g/cm3. The microstructural information obtained in this study will help establish a cell-based model to explain the mechanical response of rigid polymer foams.

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“…For instance, polyurethanes (PU) are very interesting polymers as they can be synthesized by combination of various different monomers which leads to a very rich chemistry that allows fine tuning of their physicochemical properties. PU have been broadly studied and applied in several fields, either as films, 12 flexible and rigid foams 13,14 or hydrogels, 15 among others, but they have been rarely electrospun as sole materials 16,17 . Instead, blends with large linear polymers have been more popular, 18,19 but only employing traditional solvents.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of electrospun fibers from a waterborne soy‐based polyurethane employing polyethylene oxide as a coformer

Herrán

Molinari

Bilbao

et al. 2020

J of Applied Polymer Sci

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The fabrication of electrospun fibers made from aqueous dispersions of polyurethane obtained from renewable sources is an eco-friendly method to produce porous membranes for different applications. Polyethylene oxide (PEO) has been already employed in formulations for allowing fiber formation, but its role was not yet completely understood. In this work the fabrication of electrospun fibers made from biobased polyurethane aqueous dispersion with PEO in order to obtain regular fibers is performed. The role of PEO was studied by thermal analysis, infrared and Raman spectroscopy, rheology, and fiber morphology. Polyurethane fibers were obtained only when PEO was added, otherwise the dispersion is electrosprayed and particles are formed. It was observed that PEO modifies the rheology of dispersion and assists coalescence of polyurethane particles. On the other hand, polyurethane fibers conserved their diameter and their homogeneous structure after removal of PEO by immersion in water, which indicates that the distribution of both polymers was even within the fibers. This work provides both an insight on the role of PEO and a route for the fabrication of eco-friendly biobased polyurethane microfibers from aqueous dispersions.

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The study on compressive mechanical properties of rigid polyurethane grout materials with different densities

Cited by 67 publications

References 31 publications

Synthesis of Polyurethane Foam Considering Mixture Blowing Agents for Application to Cryogenic Environments

Synthesis of Polyurethane Foam Considering Mixture Blowing Agents for Application to Cryogenic Environments

Statistical Characteristics of Polymer Grouting Material Microstructure

Fabrication of electrospun fibers from a waterborne soy‐based polyurethane employing polyethylene oxide as a coformer

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