02411nas a2200265 4500008004100000022001400041245012700055210006900182260000900251300001400260490000600274520146900280653002201749653003301771653003801804653001801842653001701860653001701877100002701894700002001921700002701941700002601968700002701994856012402021 2024 eng d a2637-610500aNonedible thevetia peruviana oil for the synthesis of biobased thermosets and vitrimers with tunable mechanical properties0 aNonedible thevetia peruviana oil for the synthesis of biobased t cFEB  a2695-27080 v63 a

Current attempts to replace fossil-derived materials with vegetable oils for polymer production mainly rely on edible oils. This approach raises sustainability concerns due to potential food security risks. This report introduces the first in-depth examination of Thevetia peruviana oil (TPO) epoxidation, an easily accessible nonedible vegetable oil, utilizing diverse acidic ion-exchange resins as catalysts. It is followed by the development of vitrimers based on epoxidized oil (ETPO) with various dicarboxylic acid hardeners. Amberlite IRC120H emerged as the most effective catalyst for the epoxidation of the oil, allowing for repeated catalyst reusability for up to five cycles. An impressive relative oxirane conversion of 98.9% was achieved after optimization. DSC analysis revealed that among the diacids, 2,2'-dithiodibenzoic acid (DTBZ) has the lowest activation energy with ETPO. Additionally, the ETPO-DTBZ-based thermosets displayed exceptional solvent resistance and thermal stability, indicative of a high degree of cross-linked networks within the system. Mechanical analyses revealed that all aliphatic hardeners resulted in soft materials, while DTBZ resulted in thermosets with tensile stress and modulus of 15 and 843 MPa, respectively. Consequently, DTBZ-ETPO thermosets were successfully recycled, repaired, and reshaped with minimal changes in the mechanical properties. The shape memory of the thermosets was also established.

10abiobasedvitrimers10aenvironmental sustainability10aepoxidizedThevetial peruviana oil10anonedible oil10aOptimization10ashape memory1 aOlosho, Adebayo, Isaac1 aAlam, Md, Shafi1 aNair, Kiran, Sukumaran1 aAmbade, Ashootosh, V.1 aAdekola, Folahan, Amoo uhttps://library.ncl.res.in/content/nonedible-thevetia-peruviana-oil-synthesis-biobased-thermosets-and-vitrimers-tunable04797nas a2200169 4500008004100000245013500041210006900176260000800245300001200253490000600265520410700271100003704378700003004415700002704445700002704472856012804499 2025 eng d00aSynthesis and characterization of thermosetting adhesives from epoxidized Thevetia peruviana oil for sustainable bonding solutions0 aSynthesis and characterization of thermosetting adhesives from e cDEC a456-4650 v43 a
The demand for bio-based epoxy thermoset alternatives within the adhesive industry has seen substantial growth in recent years. This increase is attributed to a heightened exploration of renewable materials, including biopolymers and monomers derived from renewable resources. However, despite these significant advancements, a considerable portion of the research primarily focuses on edible oils, which may inadvertently neglect critical implications for food security. So, this study explores the thermal, mechanical, and adhesive properties of epoxy thermosets derived from biobased epoxidized Thevetia peruviana oil (ETPO) cured with two diamines, 1,10-decane diamine (DDA) and m-xylene diamine (XDA), using imidazole (IM) as a catalytic initiator. The thermosets were evaluated for lap shear strength on stainless steel (SS) and aluminium (Al) substrates at varying imidazole concentrations (0–5%) and curing times (24–96 hours). The results show that DDA-cured thermosets demonstrate superior thermal stability and heat resistance, with T5% increasing from 149 °C to 256 °C and THRI from 139 °C to 162 °C as IM concentration rises. XDA-cured thermosets exhibit higher adhesive strength, peaking at 1.47 MPa on SS at 5% IM and 72 hours, but lower thermal stability, with T5% values decreasing from 157 °C to 68 °C. Imidazole's catalytic efficiency enhanced the crosslinking in both systems, with DDA providing better thermal stability and XDA delivering higher adhesive strength. These findings demonstrate the potential of ETPO-based thermosets as sustainable adhesives, offering excellent performance for industrial applications.
The demand for bio-based epoxy thermoset alternatives within the adhesive industry has seen substantial growth in recent years.

 

1 aKambikanam, Karthika, Vayalacher1 aBindu, Bhadra, Purushotha1 aOlosho, Adebayo, Isaac1 aNair, Kiran, Sukumaran uhttps://library.ncl.res.in/content/synthesis-and-characterization-thermosetting-adhesives-epoxidized-thevetia-peruviana-oil