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<p>
	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.</p>
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-tunable02417nas a2200241   4500008004100000022001400041245010900055210006900164260000800233300001400241490000700255520158900262100001901851700002301870700001901893700002001912700002101932700001701953700001901970700002801989700002702017856013102044       2026                        eng d  a0897-475600aDynamic janus hydrogen bond mimicry unlocks tough, flexible supramolecular elastomers for strain sensing0 aDynamic janus hydrogen bond mimicry unlocks tough flexible supra  cMAR  a2699-27110 v383 a<p>
	Flexible and wearable electronics demand stretchable sensors with polymer elastomers as key matrixes for mechanical flexibility and durability. However, despite their excellent elasticity, their limited mechanical strength remains a challenge. To address this limitation, in this study, we report the rational design of supramolecular polyurethane elastomers (SPUs) incorporating nucleobase-inspired aminopyrimidinedione with DDA-AAD (G-C mimic) reversible triple hydrogen bonds. This dual-domain architecture gives rise to a durable supramolecular network with enhanced mechanical properties, yielding elastomers that are soft, stretchable, and tough. By tuning of the density of dynamic cross-links, mechanical properties were systematically modulated. SPU-0.5 exhibited a maximum tensile strength of 16.14 MPa, representing a 67-fold strength enhancement over that of SPU-0. Although increasing the aminopyrimidinedione (APD) content reduced elongation, SPU-0.2 retained a high elongation of 1060% and showed the lowest residual strain during cyclic tests. To be of great interest, the activation energy increased with increasing hydrogen bonding content up to SPU-0.1, whereas beyond SPU-0.2 it decreased, likely due to extensive hydrogen bond formation. Furthermore, SPU-0.2-SP, a conductive variant, demonstrated a promising strain-sensing performance even after hundreds of cycles. Overall, the insights gained from this study advance the development of intelligent soft materials and lay the groundwork for next-generation flexible and wearable electronic devices.</p>
1 aLakshmi, Durga1 aWagh, Mahendra, A.1 aSharma, Aakash1 aAlam, Md, Shafi1 aSelvan, Muthamil1 aTorris, Arun1 aMondal, Titash1 aSanjayan, Gangadhar, J.1 aNair, Kiran, Sukumaran  uhttps://library.ncl.res.in/content/dynamic-janus-hydrogen-bond-mimicry-unlocks-tough-flexible-supramolecular-elastomers-strain