Biobased Epoxy: Applications in Mendable and Reprocessable Thermosets, Pressure‐Sensitive Adhesives and Thermosetting Foams

Ruseckaite, Roxana Alejandra; Stefani, Pablo Marcelo; Altuna, Facundo Ignacio

doi:10.1002/9783527823604.ch12

Cited by 3 publications

(1 citation statement)

References 104 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was due to the fact that the viscosity of the mixture depended mainly on the interaction of the molecular chains at low shear rates, which led to changes in molecular orientations and/or orientation in the direction of flow. When the catalyst content was increased (ESOISO 0.05 to 0.1 mol % Al(OTf) 3 ), the degree of cross-linking of the polyols was increased, which enhanced the interaction of the polymer chain. , This was observed by an increase in ETA* (complex viscosity) with values of 117.71, 563.64, and 1028.1 mPa/s –1 at 50 s –1 for the polyols ESOISO 0, 0.05, 0.07, and 0.1 mol % of the catalyst, respectively. In addition, as the shear rate increases, the physical entanglements of the molecular chain gradually open up, and the frictional resistance between the polymer chains decreases, so that the viscosity drops.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Performance of Biobased Polyurethane Adhesives from Epoxidized Soybean Oil and Isosorbide

Silva,

Moerbitz,

Souza

et al. 2024

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

Biobased polyurethane pressure-sensitive adhesives were produced with polyols based on epoxidized soybean oil (ESO) and isosorbide (ISO). Soybean oil-based polyol was synthesized via epoxide ring-opening with ISO and catalyzed by adding aluminum triflate (Al(OTf) 3 )�named polyols ESOISO. Two polyurethane recipes were produced by mixing the polyol ESOISO and polylactic acid (PLA) and then reacting with hexamethylene diisocyanate (HDI)�named PU ESOISO and PU ESOISO/PLA. The characteristic molecular groups of polyols and polyurethanes were evidenced using FTIR and NMR techniques ( 13 C NMR and 1 H NMR, HSQC, and HMBC-2D NMR). The exothermic peak of ESOISO 0.1 mol % (Al(OTf) 3 ) ranged between 80 and 115 °C. Al(OTf) 3 promoted the curing, i.e., lower E a consumption and increased availability of OH groups in the polyol. The T g of PU adhesives ranged between −15.45 and −13.86 °C. The H-bond supramolecular structure provided by the polar groups enabled the networks to behave as adhesives, improving the self-healing character when the bonded interface was damaged. PU ESOISO/PLA achieved high-efficiency self-healing and adhesivity performance with the potential for a sustainable adhesive framework design.

show abstract

Section: Resultsmentioning

confidence: 99%