Thermal and mechanical behavior of flexible polyurethane‐molded plastic films and water‐blown foams with epoxidized soybean oil

Abstract

Water-blown flexible polyurethane foams and molded plastic films were made by replacing 0 to 50% of Voranol V V R 4701 in the B-side of foam and plastic film formulation by epoxidized soybean oil (ESBO). Physical properties of foams including density, 50% compression force deflection (CFD), 50% constant deflection compression (CDC), and resilience were determined. A dynamic mechanical spectrometer (DMS) and a differential scanning calorimeter (DSC) were used to characterize the hard segment (HS) and soft segment (SS) ratio and thermal properties of plastic. Various functional groups in both flexible polyurethane foam and plastic film were characterized using Fourier transform-infrared spectroscopy with attenuated total reflectance (FTIR-ATR). When increasing the ESBO content, both density and 50% CFD of water-blown polyurethane foams decreased first, then increased. On the other hand, the 50% CDC and resilience of foams showed a sharp increase and decrease, respectively. When increasing the ESBO content, the peak of tan d in DMS analysis and Dc p in DSC analysis of plastic films both decreased indicating the hard segment increased and the soft segment decreased in plastic film, respectively. The FTIR-ATR results also show the hydrogen-bonded urethane group increased in plastic films with increasing ESBO content.

Optimizing the lignin based synthesis of flexible polyurethane foams employing reactive liquefying agents

“…In fact, in the spectra it is possible to observe the typical signal of urethanic linkages, such as the –NH vibrational stretching (3500–3200 cm −1 ) and the –CO characteristic vibration (1730–1640 cm −1 ) . Specifically, three absorption bands can be found in this region: the first, at about 1550 cm −1 , is typical of –CN urethanic linkage and the others are attributable to –CO stretchings . The absorption peak at about 1620 cm −1 is characteristic of bidentate urea that interacts with surrounding molecules by means of hydrogen bonds, while the second one, at about 1710 cm −1 , is attributable to the presence of free urea.…”

“…Therefore, polyurethane foam properties can be modulated by adapting the composition and the ratio of these blocks. Currently, polyurethanes are mainly synthesized starting from petrochemical polyols, but many studies were carried out over the last decades in order to replace them with renewable sources, such as natural vegetable oils and epoxidized oils …”

Influence of Recycled Polyurethane Polyol on the Properties of Flexible Polyurethane Foams

“…The small size droplet led to more surface area and facilitated the reaction between NCO and H 2 O. This gave rise to small cell foam and low in density [10,11] Tensile modulus and tensile strength of PU foam are reported in Fig. 6.…”

Polyurethanes from benzene polyols synthesized from vegetable oils: Dependence of physical properties on structure

“…One of the approaches to improved properties is to modify the chemical structure of the polyols, either by the addition of reactive groups (functionality), modifying the placement of the functional groups on the polyol molecule, or modifying the structure of the polyol molecule. The literature details several chemical reactions performed on different types of vegetable oils that seeks to serve this purpose 2–19. Generally, these efforts have led to the formation of aliphatic polyols having their hydroxyl groups in secondary3, 6–8, 18, 19 and primary positions 4, 5, 10, 14, 20…”