Closed-form kinetics are formulated and parameterized for PMDI-10, a fast curing polyurethane, including polymerization and foaming. PMDI-10 is chemically blown, where water and isocyanate react to form carbon dioxide. The isocyanate reacts with polyol in …
The major aim of the present study is to improve the thermal characteristics of polyurethane foams (PUFs) that have been almost exclusively used for thermal …
The FT-IR spectra obtained for the tetradecane (PCM), microPCMs, pure PU foam, PUF/microPCMs composites, and PUF/macroPCMs composites are shown in Fig. 2 f and g.As can be seen in Fig. 2 f, characteristic peaks at 2960 cm −1, 2920 cm −1, and 2850 cm −1 correspond to –CH, –CH 2, and –CH 3 groups of tetradecane, respectively.
Characterization on insulation performance, post-stability, and foaming process of rigid polyurethane sandwich panel for cold storage warehouse Jie Xu1,*, Tao Wu2, Wei Sun3, Chuang Peng4,* 1 PhD candidate, Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, ...
Thermophysical properties investigation of phase change microcapsules with low supercooling and high energy storage capability: Potential for efficient solar energy thermal management Journal of Materials …
In this study, a series of the cross-linked polyurethane (PU)/PEG4000 blend was synthesized as novel form-stable phase change materials (FSPCMs) for …
Preparation of Polyurethane Prepolymers. An amount of 57 wt% of the weighed PPG1000 was added into a three-mouth flask and dehydrated in a vacuum at 120 °C in an oil bath for 1 h and then naturally cooled down to about 80 °C. Afterwards, 38 wt% IPDI was added to PPG1000, stirred evenly at 80 °C.
Wiskind cold storage board features: 1. Energy saving. Wiskind cold chain COLORSPAR ® polyurethane cold storage board uses a new generation of polyurethane pentane B1 foaming technology of rigid core material, polyurethane rigid foam thermal conductivity is less than 0.023mW/ (m·K). The dense foam is fully bonded with the surface material to ...
DOI: 10.1002/mame.202100600 Corpus ID: 244618578 Fabrication of Thermoplastic Polyurethane Foams with Wrinkled Pores and Superior Energy Absorption Properties by CO 2 Foaming and Fast Chilling @article{Jun2021FabricationOT, title={Fabrication of ...
Density Modeling of Polyurethane Box Foam Lu Shen, 1 Yusheng Zhao, 1 Ali Tekeei, 1 Fu-Hung Hsieh, 2 Galen J. Suppes 1 1 Department of Chemical Engineering, University of Missouri-Columbia ...
The worldwide consumption of PU was estimated at 60.5 billion USD in 2017, and it was predicted to be over 79 billion USD by 2021 [ 15 ]. In 2016, it represented nearly 9% of the global consumption of plastics [ 16 ]. Moreover, as illustrated in Figure 1, the principal consumption of PUs is in the form of foams [ 17 ].
Polyurethane foams (PUFs) with enhancedenergy storage capacity were prepared for energy storage. PUFs with polyethylene oxide segments as side chain exhibited much higher phase change enthalpy. PUFs display phase change at 25-55 °C by absorbing and releasing 0–30 J/g heat.
The foaming temperatures were 110 C for LDPE, 150 C for PP, and 265 C for LCB-PET. Thereafter, the pressure was rapidly released with a depressurization rate of approximately 100 MPa/s, leading to the formation of foamed cells. All …
Polymer foams commonly used in electrochemical energy storage include polyurethane foam, melamine foam, and polystyrene foam. The parameters, such as density, pore size distribution, mechanical and thermal properties depend on the foaming method The preparation of polyurethane foam can be divided into the chemical method …
The polyurethane foaming process involves two competing reac-. tions (gel reaction and blow reaction). The gel r eaction, also. sometimes called the polymerization reaction, involves the reac ...
Polyurethane (PU) foam composites with improved thermal energy storage capability were fabricated based on microencapsulated phase change materials …
Thermal energy storage (TES) capacity of PU foams was improved by incorporating both, mSP‐(PS‐RT27) or Micronal®DS 5001X, with the values close to those reported in the literature (16 J/g ...
Nanodispersions of carbon nanofiber in polyurethane components have been prepared. Rheological estimations show that a filler loading as low as 3% in components is sufficient for making a highly cross-linked network. Reactive foaming of these nanodispersions was carried out to make polyurethane nanocomposite foams.
Polyurethane foams (PUFs) with enhancedenergy storage capacity were prepared for energy storage. PUFs with polyethylene oxide segments as side chain …
The role of elastic strain energy in promoting cell nucleation is clarified. • Elastic strain energy, including stretching and compressing strain energies, can promote cell nucleation. • Uniform sub-microcellular TPU microfilms with a …
Synthesized phase change materials (PCMs) based on paraffin and calcium carbonate. • Improving the thermal characteristics of polyurethane foams (PUFs) with PCMs. • Thermal conductivity assessment of multilayer PUF panels with and without PCMs. •
The U.S. Department of Energy''s Office of Scientific and Technical Information @article{osti_1369443, title = {The kinetics of polyurethane structural foam formation: Foaming and polymerization}, author = {Rao, Rekha R. and Mondy, Lisa A. and Long, Kevin N. and Celina, Mathew C. and Wyatt, Nicholas and Roberts, Christine C. and …
The aim of this work was to develope novel 3D printable thermoplastic polyurethane (TPU) blends with thermal energy storage (TES) capabilities. The target are potential applications for winter sport equipment. Different amounts of an encapsulated paraffin were ...
Usage of thermo-regulative phase change material (PCM) doped polyurethane (PU) foam (PU-PCM) as a building component in cold storage can …
Rigid polyurethane foams (RPUFs) are characterized by their excellent viable properties; thus, these materials can be successfully used as thermal insulation materials. The main problem, the solution of which is partly indicated in this paper, is that the products for the synthesis of RPUFs are produced from petrochemicals. Due to this, the …
These optimized RPU foams were able to overpass the drawbacks exhibited by the previous composites over the studied temperature range, working as insulating and thermal energy storage materials. The change in the formulation allowed to decrease the final foam density and enhance their mechanical strength. The effect of the …
Herein, a new microcellular foaming strategy with two-step adsorptions was developed to prepare thermoplastic polyurethane (TPU) foams with gradient cellular structures. The TPU samples were saturated with low-pressure CO 2 in the first sorption stage and partially saturated with high-pressure CO 2 in the second sorption stage.
By customizing the integrated electrodes using laser engraving, the multiscale porous MXene/rGO aerogels-integrated energy storage-pressure sensing system with PU-encapsulation is shown in Fig. 1 D. 3.2 .
Stronger interaction energy and smaller free volume distribution existed in PUNC interface, which was obviously related to the PU soft segment. Additionally, prepared PUTWC using the single-layer ...
The compression strength, contact angle, and surface energy of the rigid polyurethane foam are 33.36 kPa, 109.6, and 21.8 mJ/m 2 after adding 0.20 part of double-effect baking powder, …
Polyurethane rigid foam is a widely used insulation material, and the behavior characteristics and heat absorption performance of the blowing agent used in the foaming process are ...
The formation of a microcellular structure within the selected range of foaming conditions is caused by gas diffusion-driven cell growth and cell shrinkage induced by gas escape. Elastomers have a ...
The effect of the operating pressure (atmospheric, 800 mbar, and 700 mbar) and microcapsules content (up to 30 wt%) on the physical, mechanical, and thermal PU foam properties was studied. The reduction of the pressure from atmospheric to 800 mbar did not have any effect on the cell size, strut thickness, and compression strength 10% of ...