Thermal-Mechanical Characterization of Polyurethane Rigid Foams: Effect of Modifying Bio-Polyol Content in Isocyanate Prepolymers

Chemical Recycling of Used Printed Circuit Board Scraps: Recovery and Utilization of Organic Products

“…Typically, the width of a tan delta curve is closely related to the phase separation between the soft and hard segments in a polyurethane network. The broadening of the tan delta curve revealed glass transition of the crosslinked polyurethanes [47][48][49]. As mentioned above, the recycled polyol used in this study is an aromatic ring-rich PO adducts; thus, it exhibits good compatibility with pMDI.…”

Sustainable rigid polyurethane foams based on recycled polyols from chemical recycling of waste polyurethane foams

“…The absorption peaks appearing at 1374 and 1454 cm −1 correspond to the bending vibrations of CH in the polyol chain . Characteristic peaks due to CO of urethane groups (1732 cm −1 ), CO of urea groups (1683 cm −1 ), and NH bending vibrations (1517 cm −1 ) are observed in the FTIR spectra of recycled polyol (RP‐A and RP‐B), due to the limited glycolysis of PU . The intensity ratios of absorption peaks in the FTIR spectra of the recycled polyols were investigated to compare the structural features of RP‐A and RP‐B in terms of aromaticity and hydroxyl values and are summarized in Table .…”

Tannin-Based Biofoams-a Review

“…In general too, when partially biobased polyurethanes are described these are formed by reaction of a biobased polyol reacted, still with an isocyanate, a synthetic material. Many of these semibiosourced polyurethanes are used for foams or other applications and are described, even recently, in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. This approach has been applied to foams derived from such semi-biosourced polyurethanes, even recent literature being quite consequent on this subject [12][13][14][15][16][17].…”

“…Many of these semibiosourced polyurethanes are used for foams or other applications and are described, even recently, in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. This approach has been applied to foams derived from such semi-biosourced polyurethanes, even recent literature being quite consequent on this subject [12][13][14][15][16][17]. Many different renewable materials are used to prepare the polyols of these semi-biosourced polyurethanes and their derivate foams [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

“…This approach has been applied to foams derived from such semi-biosourced polyurethanes, even recent literature being quite consequent on this subject [12][13][14][15][16][17]. Many different renewable materials are used to prepare the polyols of these semi-biosourced polyurethanes and their derivate foams [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. More recently, foams derived, totally or partially, from renewable raw materials have attracted attention as well, these been based mainly on lignin, proteins [18,19] or tannins, this latter being the subject of this review, being a more advanced technology.…”