pps proceeding - Abstract Preview
pps proceeding
Symposium: S11 - Polymerization and synthesis
Oral Presentation
 
 

Sustainable Self-Healing Elastomers with Thermo-reversible Network Derived from Biomass via Emulsion Polymerization

SAHU PRANABESH (1)*

(1) Indian Institute of Technology, Kharagpur - West Bengal - India

Motivated by the growing demand for greener and sustainable polymer systems, self-healing elastomer was prepared by a simple and green emulsion polymerization of terpene and furfural based monomers. The synthesized copolymers show well defined molecular weights between 59,080−84,210 Da and glass transition temperature between −25 to −40 °C, implying rubbery properties. A set of 1-D and 2-D NMR spectroscopy supports the formation of the copolymer and nuclear spin-spin coupling in the copolymer. The reactivity ratio indicates azeotropic nature of copolymerization. The synthesized elastomer consists of crosslinking copolymer moiety, shows excellent self-healing properties. In particular, the synthesized polymer displays both elastomeric properties and stimuli responsive behavior, towards temperature and water. A thermoreversible network was achieved for the first time by reacting the furan-based polymer with bismaleimide as cross linker, via a Diels−Alder (DA) coupling reaction. The reversible nature of the polymer network was evidenced by infrared and NMR spectroscopy. The thermally reversible character of the DA crosslinked adduct was confirmed by applying retro-Diels-Alder reaction (observed in DSC analysis) and mechanical recovery was verified by Dynamic Mechanical Analysis. The network polymers displayed excellent self-healing ability, triggered by heating at 130 °C for 4-12 h when their scratched surface was screened by optical microscopic visualization. The repeated heating and cooling cycles showing the regular reversal of storage modulus (E’), which confirms the mechanical recovery of the crosslinked DA-adduct. The healing efficiency was obtained about 78 % from the AFM images, confirming the thermoreversible healing nature of crosslinked DA-adduct at 130 °C for 6h. These new type of elastomers engineered from green resources using a solvent-free system could be valued as a sustainable smart and promising materials to replace the petroleum-based products.