Synthesis and characterization of novel polyurethane acrylates based on soy polyols

Abstract

Novel polyurethane acrylates (PUAs) were prepared by the reaction of soy polyols with isophorone diisocyanate and hydroxyethylacrylate. FTIR results confirmed the formation of PUAs from different kinds of soy polyols. The glass transition, damping properties, thermal stabilities, and mechanical properties of PUAs were characterized by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), and universal test machine. The morphology of PUAs was investigated by scanning electron microscope (SEM). The results of the swelling experiments showed that the crosslinking density of polyurethanes and PUAs directly correlated with the hydroxyl (OH) number of polyols. The DSC and DMA results displayed that the glass transition temperature of PUAs was higher than that of polyurethanes and increased with OH number. Furthermore, the formation of PUA networks improved the damping properties of polyurethanes. TGA results demonstrated the acrylation of polyurethanes improved its thermal stability. The initial decomposition temperature of polyurethanes and PUAs also increased with OH number. When compared with polyurethanes, the tensile strengths of PUAs were improved by 118%, 39%, and 9%, respectively, with the increase of OH number of three soy polyols.

Thermal, mechanical properties, and low‐temperature performance of fibrous nanoclay‐reinforced epoxy asphalt composites and their concretes

“…However, in our case, the addition of ATT to the EA improved both the strength and toughness. Similar results were reported for other ATT/polymer composites . Wang et al .…”

“…showed that the nonmetric dispersion of ATT in the polymer matrix led to the improved modulus and strength. In this study, the tensile strength and toughness increase in the presence of ATT also directly benefitted from the reinforcement provided by the well‐dispersed ATT interfacial interaction between ATT and EA . As for the high‐ATT‐loading composites, the formation of agglomerates, as the SEM images show [Figure (e,f)], resulted in the fact that the ATTs could not act efficiently to dissipate the mechanical energy and instead served as flaws or defects and crack‐initiation sites .…”

Carbon nanofibers reinforced soy polyol-based polyurethane nanocomposites

“…First, urethane bonds as well as chain segments of polyols decompose to form volatile products such as carbon dioxide. Second, the oxidative decomposition of isocyanates compound takes place [3,29]. The TG and DTG curves for all nanocomposites indicate that there are also two main stages of thermal degradation.…”

“…And the vegetable oils are considered to be one of the cheapest and most abundant biological sources available. Due to the specific structures and abundance, these vegetable oils have become an attractive resource that can convert to bio-based polyols to produce PUs [3][4][5][6][7]. Polyurethanes are a class of versatile polymers that have widely employed in coating, adhesive, foam, elastomer, composite, and biomedical materials, etc.…”

Polyurethane/aromatic polyamide sulfone copolymer dispersions from transesterified castor oil

“…The polyols used in PUD synthesis are polyether, polyester and polycarbonate. However, vegetable oils have become attractive for the synthesis of PUDs because of their economical benefits and the fact that they are made from renewable resources [18][19][20][21][22][23]. CO is one of the vegetable oils that used as polyol in the synthesis of PU due to its cheapness and availability as renewable material [24][25][26].…”