In‐situ thermal aging of biobased and conventional rigid polyurethane foams nanostructured with bacterial nanocellulose

Diaz, Tomás Joaquin; Cerrutti, Patricia; Chiacchiarelli, Leonel Matías

doi:10.1002/app.51824

Cited by 4 publications

(3 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The morphologies of as-prepared foams were characterized using a scanning electron microscope (SEM; Figure 2a-c). The SEM images reveal numerous spherical cells with similar obturator structure, indicating they are typical rigid polymeric foams [25]. An enlarged view in Figure 2b clearly displays that these ruptured microspheres have internal hollow spaces, indicating the porous cell structure of the foams.…”

Section: Resultsmentioning

confidence: 89%

Long-Service-Life Rigid Polyurethane Foam Fillings for Spent Fuel Transportation Casks

Zhang,

Shen,

et al. 2023

Preprint

View full text Add to dashboard Cite

Soft materials bearing rigid, lightweight, and vibration-dampening properties offer distinct advantages over traditional wooden and metal-based fillings for spent fuel transport casks, due to their low density, tunable structure, excellent mechanical properties, and ease of processing. In this study, a novel type of rigid polyurethane foams is prepared using a conventional polycondensation reaction between isocyanate and hydroxy groups. Moreover, the density and size of the pore in these foams are precisely controlled through simultaneous gas generation. The as-prepared polyurethane exhibits high thermal stability exceeding 185 °C. Lifetime predictions based on thermal testing indicate that these polyurethane foams could last up to over 60 years, which is double lifetime of conventional materials of about 30 years. Due to their occlusive structure, the mechanical properties of these polymeric materials meet the design standards for spent fuel transport casks, with maximum compression and tensile stresses of 6.89 and 1.37 MPa, respectively, at a testing temperature of -40 °C. In addition, these polymers exhibit effective flame retardancy; combustion ceased within 2 s after removal of the ignition source. All in all, this study provides a simple strategy for preparing rigid polymeric foams, presenting them as promising prospects for application in spent fuel transport casks.

show abstract

Section: Resultsmentioning

confidence: 89%

Long-Service-Life Rigid Polyurethane Foam Fillings for Spent Fuel Transportation Casks

Zhang,

Shen,

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…To evaluate the pore structure of the as-prepared foams, the morphologies of RPUFs with different densities were characterized using a scanning electron microscope (SEM; Figure 2 a–c). The SEM images reveal numerous spherical cells with similar obturator structures, indicating they are typical rigid polymeric foams [ 29 ]. An enlarged view in Figure 2 b clearly displays that these ruptured microspheres have internal hollow spaces, indicating the porous cell structure of the foams.…”

Section: Resultsmentioning

confidence: 99%

Long-Service-Life Rigid Polyurethane Foam Fillings for Spent Fuel Transportation Casks

Zhang,

Shen,

et al. 2024

Polymers

View full text Add to dashboard Cite

Soft materials bearing rigid, lightweight, and vibration-dampening properties offer distinct advantages over traditional wooden and metal-based fillings for spent fuel transport casks, due to their low density, tunable structure, excellent mechanical properties, and ease of processing. In this study, a novel type of rigid polyurethane foam is prepared using a conventional polycondensation reaction between isocyanate and hydroxy groups. Moreover, the density and size of the pores in these foams are precisely controlled through simultaneous gas generation. The as-prepared polyurethane exhibits high thermal stability exceeding 185 °C. Lifetime predictions based on thermal testing indicate that these polyurethane foams could last up to over 60 years, which is double the lifetime of conventional materials of about 30 years. Due to their occlusive structure, the mechanical properties of these polymeric materials meet the design standards for spent fuel transport casks, with maximum compression and tensile stresses of 6.89 and 1.37 MPa, respectively, at a testing temperature of −40 °C. In addition, these polymers exhibit effective flame retardancy; combustion ceased within 2 s after removal of the ignition source. All in all, this study provides a simple strategy for preparing rigid polymeric foams, presenting them as promising prospects for application in spent fuel transport casks.

show abstract

“…Thermal Conductivity. Foam thermal conductivity was measured using the transient method reported by Diaz et al 18 All samples were conditioned at 23 °C and 50% RH for 24 h before testing. Six determinations were made for each condition.…”

Section: ■ Introductionmentioning

confidence: 99%

Cellulose–Chitosan Biodegradable Materials for Insulating Applications

Lujan

Goñi

Martini

2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Bio-based lightweight porous materials have attracted attention due to their unique properties and have become an interesting alternative to petroleum-based foams such as expanded polystyrene (EPS) and polyurethane foams. In this work, biodegradable cellulose pulp−chitosan foams were obtained through a low-cost, simple, and scalable method. A full factorial design was carried out to study the effects of three experimental factors (chitosan content, foaming agent concentration, and foaming time) on apparent density and mechanical properties. The prepared foams displayed low apparent densities (0.06−0.12 g/cm 3 ), good mechanical performance (elastic modulus: 0.18−1.20 MPa, compressive strength: 0.02−0.11 MPa), excellent thermal insulation properties (thermal conductivities: 0.03−0.04 W/mK), and high biodegradation rates. The increase of chitosan content improved the water resistance and mechanical strength. Finally, these materials could be suitable for several applications in which thermal insulation, mechanical resistance, and water stability are crucial, including packaging and construction, as an alternative to traditional nonbiodegradable materials.

show abstract

In‐situ thermal aging of biobased and conventional rigid polyurethane foams nanostructured with bacterial nanocellulose

Cited by 4 publications

References 64 publications

Long-Service-Life Rigid Polyurethane Foam Fillings for Spent Fuel Transportation Casks

Long-Service-Life Rigid Polyurethane Foam Fillings for Spent Fuel Transportation Casks

Long-Service-Life Rigid Polyurethane Foam Fillings for Spent Fuel Transportation Casks

Cellulose–Chitosan Biodegradable Materials for Insulating Applications

Contact Info

Product

Resources

About