Preparation of open cell rigid polyurethane foams and modified with organo-kaolin

Wang, Guojian; Yang, Tao

doi:10.1177/0021955x19880507

Cited by 7 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Evidently, in the present work, an open-cell structure was distinguished for O-RPUF from the corresponding SEM images. The apertures on the cell walls weakened the foam’s ability to resist compression force, illustrating that the rise in the open-cell rate inevitably caused the decline in compressive strength, coinciding with the results reported by Wang et al [ 47 ]. In comparison with O-RPUF, the compressive strength of RPUF/APP20 reached 108.14 kPa, likely owing to the reinforcement of inorganic fillers [ 52 ].…”

Section: Resultssupporting

confidence: 89%

“…Apertures on the cell walls derived from the impact of the cell-opening agent are clearly seen, connecting individual cells to form interconnection channels inside the foam matrix. Here, the influence of the cell-opening agent on cell structure is certified by the SEM image, in accordance with previous research [ 6 , 47 ]. Moreover, these open windows between cells offered chances for CO 2 to transfer before curing, therefore endowing O-RPUF with a mean pore size of 866.35 μm, 24.5% larger than the pristine RPUF.…”

Section: Resultssupporting

confidence: 84%

See 1 more Smart Citation

Acoustic Performance and Flame Retardancy of Ammonium Polyphosphate/Diethyl Ethylphosphonate Rigid Polyurethane Foams

et al. 2022

View full text Add to dashboard Cite

Flame-retardant water-blown rigid polyurethane foams (RPUFs) modified by ammonium polyphosphate (APP) and diethyl ethylphosphonate (DEEP) were synthesized by a one-pot free-rising method. We performed scanning electron microscopy (SEM), compression strength tests, acoustic absorption measurements and thermogravimetric analysis, as well as limited oxygen index, vertical burning and cone calorimeter tests to investigate the mechanical properties, acoustic performance and flame retardancy of the foams. SEM confirmed that the open-cell structures of the foams were successfully constructed with the introduction of a cell-opening agent. Upon using 20 php APP, the average acoustic absorption coefficient of the foam reached 0.535 in an acoustic frequency range of 1500–5000 Hz. The results of thermogravimetric analysis demonstrated that the incorporation of APP and DEEP can effectively restrain mass loss of RPUFs during pyrolysis. In particular, the compressive strength of a foam composite containing 5 php APP and 15 php DEEP increased to 188.77 kPa and the LOI value reached 24.9%. In a vertical burning test and a cone calorimeter test, the joint use of APP and DEEP endowed RPUFs with a V-0 rating and they attained a THR value of 23.43 MJ/m2. Moreover, the addition of APP improved the acoustic absorption performance of the foam, verified by acoustic absorption measurements. Considering potential applications, the formulation containing 15 php APP and 5 php DEEP could be used in the preparation of a new flame-retardant acoustic absorption rigid polyurethane foam.

show abstract

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 84%

Acoustic Performance and Flame Retardancy of Ammonium Polyphosphate/Diethyl Ethylphosphonate Rigid Polyurethane Foams

et al. 2022

View full text Add to dashboard Cite

show abstract

“…5 However, inorganic adsorbents, such as clay and glass wool, have a low oil adsorption rate and poor recoverability. 6 Organic adsorbents are commonly polymerbased porous materials with open pores, such as polyurethane (PU) foam, 7 melamine foam (MF), 8 polyvinyl alcohol (PVA) foam, 9 and so forth. Polymer-based non-woven fabric is also used as an organic adsorbent, but its low porosity leads to less adsorption efficiency compared to foam.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Polymer Nanofiber Structures for Liquid Contamination Adsorption

Liu

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Green amphiphilic decontamination materials with high-performance, ultrafast, and highly efficient liquid contamination adsorption are of great significance to environmental protection. In this work, an ethylene-vinyl alcohol copolymer with both hydrophilic and hydrophobic chain fragments was selected as the matrix (amphiphilic adsorption), a topological grafting structure was designed for chain entanglement (to enhance fiber integrity), and then the aggregate structure was controlled with a soft dispersed phase (to facilitate fiber formation). Finally, environmental-friendly supercritical CO2 foaming is used to obtain the three-dimensional (3D) polymer nanofiber structures (to increase fiber-structure porosity) for liquid contamination adsorption. The strategy takes full advantage of the synergistic effect from the multi-scale structure, including the random copolymer structure (repeating unit scale in the molecular chain), topological structure (molecular chain scale), microphase separation structure (aggregate scale), and nanofiber structure (porous scale). The obtained adsorption amphiphilic material adsorbed liquid contamination with a high efficiency of 64.78 g/g and a large adsorption rate of 1.14 g/g·s–1 (kinetic constant) for carbon tetrachloride, attributing to its unique 3D polymer nanofiber structure with a large specific surface area and a large amount of porous space to adhere and to be filled by liquid contamination, respectively. This work provided a strategy for the green preparation of environment-friendly and high-performance decontamination materials.

show abstract

“…Moreover, as the AlN fillers used in this study have a large particle size, we can deduce that when the filler content increases, the open cell content of the foams increases. According to Wang and Yang, 36 the mechanical properties decreases as the open cell content increases. This evolution is also valid for the foams considered in this study as the tensile strength and elongation at break decreases as the filler content increases and therefore open cell content increases.…”

Section: Resultsmentioning

confidence: 98%

Improvement of thermal conductivity of rigid polyurethane foams with aluminum nitride filler

Akkoyun

2021

Cellular Polymers

View full text Add to dashboard Cite

The aim of this work is the fabrication of electrically insulating composite rigid polyurethane foams with improved thermal conductivity. Therefore, this study is focused on the effect of aluminum nitride (AlN) on the thermal and electrical conductivities of rigid polyurethane foams. For this purpose, aluminum nitride/rigid polyurethane composite foams were prepared using a three-step procedure. The electrical and thermal conductivities of the foams were characterized. The thermal transitions, mechanical properties and morphology of the foams were also examined. The results reveal that AlN induces an increase of the thermal conductivity of rigid polyurethane foam of 24% which seems to be a relatively noticeable increase in polymeric foams. The low electrical conductivity of the foams is preserved.

show abstract

Preparation of open cell rigid polyurethane foams and modified with organo-kaolin

Cited by 7 publications

References 19 publications

Acoustic Performance and Flame Retardancy of Ammonium Polyphosphate/Diethyl Ethylphosphonate Rigid Polyurethane Foams

Acoustic Performance and Flame Retardancy of Ammonium Polyphosphate/Diethyl Ethylphosphonate Rigid Polyurethane Foams

Three-Dimensional Polymer Nanofiber Structures for Liquid Contamination Adsorption

Improvement of thermal conductivity of rigid polyurethane foams with aluminum nitride filler

Contact Info

Product

Resources

About