Tuning of renewable sponge‐like polyurethane physical‐chemical and morphological properties using the pullulan as a reactive filler

Maia, Lana S.; Bomfim, Anne Shayene Campos de; Oliveira, Daniel M.; Pinhati, Fernanda Romanholi; Conceição, M.O.T. da; Barud, Hernane S.; Medeiros, Simone A.; Rosa, Derval S.; Mulinari, Daniella Regina

doi:10.1002/app.53619

Cited by 4 publications

(2 citation statements)

References 74 publications

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“…In addition, the peak at 3434 cm −1 corresponds to the N-H bond in urethane [22]. For the monomer of poly(ether polyol), the O-C-O stretching peak appears at 1089 cm −1 [23]. The C=C bonds related to the aromatic groups in the MDI monomer are found at 1660 cm −1 [24].…”

Section: Resultsmentioning

confidence: 99%

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

Zhang,

Shen,

et al. 2023

Preprint

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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.

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Section: Resultsmentioning

confidence: 99%

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

Zhang,

Shen,

et al. 2023

Preprint

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show abstract

“…For comparison, the isocyanate (NCO) group was reported at 2278 cm −1 [ 27 ], which showed very weak peaks in three RPUFs, suggesting that almost all of the polymeric MDI was reacted in the polymerization to form the crosslinking polyurethane foams. Another key monomer of poly(ether polyol) had a strong C-O-C stretching peak at 1089 cm −1 [ 28 ], which was also found in the as-prepared polyurethane materials. These results indicate the successful synthesis of rigid polyurethane foams using PEG-(OH) 2 and polymeric MDI.…”

Section: Resultsmentioning

confidence: 99%

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

Zhang,

Shen,

et al. 2024

Polymers

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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.

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Bacterial cellulose‐modified castor oil‐based polyurethane sponge for hexavalent chromium removal

Maia,

Pinhati,

Monteceli

et al. 2023

J of Applied Polymer Sci

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Due to the multiple industrial applications of chromium compounds and their dangerous nature for the environment, the development of adsorbent materials has been investigated. In line with this reality, bacterial cellulose (BC) has become a potential filler in the polymeric matrix due to its ability to remove toxic metals; however, its performance is little explored. This research proposes a new approach for BC as a filler in castor oil‐based polyurethane, obtaining a sponge for Cr(VI) removal. The pure PU and PU + X%BC sponges (X stands for BC content between 5 and 20 wt%) were characterized by Fourier‐transform infrared spectroscopy, scanning electron microscopy, optical microscopy, density, contact angle (CA), and thermogravimetric analysis. Sorption capacity and efficiency were evaluated as a function of the fiber content, with tests performed in function of contact time (2.5 min to 3 h) at 50 mg L−1. The BC fillers of the sponges increased the density and influenced the morphological, chemical structural, thermal, and sorption properties. Thus, the sponge (PU + 20%BC) presented the highest CA (104.4°) and the best sorption capacity and efficiency (4.3 mg g−1 and 43.2%). The sorption mechanism was well‐defined by isotherm models, presenting a maximum adsorption capacity of 23.5 mg g−1 and best fit (R2 = 0.989) with the Freundlich isotherm. The sponge is an efficient material for Cr (VI) removal and provided a promising insight into an adsorption mechanism study.

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Tuning of renewable sponge‐like polyurethane physical‐chemical and morphological properties using the pullulan as a reactive filler

Cited by 4 publications

References 74 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

Bacterial cellulose‐modified castor oil‐based polyurethane sponge for hexavalent chromium removal

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