Pillar[5]arenes-based high-T_g thermosets for the capture of volatile organic compounds

Abstract

Volatile organic compounds (VOCs) continue to be one of the biggest problems for air quality and it is becoming increasingly urgent to find new systems capable of limiting their concentration...

Supramolecular Cross-Linking of Hydrocarbon Polymers for the Formation of High-Performance and Recyclable Materials

“…Indeed, it is known in the literature that short alkyl chains are hardly recognized by P [5]A derivatives. 23,24 As a result, the physical mixture of P[n]A and hydrocarbon polymers such as poly(1-decene) (PD) or poly(5-hexyl-2-norbornene) (PNBE-Hxl) leads to cross-linked materials, as shown by a transition from liquid to solid for polymers with a low T g (PD) or by the presence of a rubbery plateau for polymers with high T g (PNBE-Hxl). We also demonstrate that by removing the host, DM-P[5]A, a pristine polymer free of cross-links is recovered, demonstrating the perfectly reversible nature of the cross-links.…”

“…While the simplicity of this approach is appealing, it relies on the unique ability to form a 1:2 host/guest complex, which has rarely been reported compared to the 1:1 complexation stoichiometry. , Furthermore, in the case of hydrocarbon polymers, the guest must be an alkyl chain, and examples of alkyl complexation are scarce in the literature. − Here, we demonstrate that P­[ n ]­A derivatives such as dimethoxypillar[5]­arene (DM-P[5]­A; Scheme ) are able to form 1:2 host/guest complexes with alkanes having six carbons or more. Indeed, it is known in the literature that short alkyl chains are hardly recognized by P[5]­A derivatives. , As a result, the physical mixture of P­[ n ]­A and hydrocarbon polymers such as poly­(1- decene) (PD) or poly­(5-hexyl-2-norbornene) (PNBE-Hxl) leads to cross-linked materials, as shown by a transition from liquid to solid for polymers with a low T g (PD) or by the presence of a rubbery plateau for polymers with high T g (PNBE-Hxl). We also demonstrate that by removing the host, DM-P[5]­A, a pristine polymer free of cross-links is recovered, demonstrating the perfectly reversible nature of the cross-links.…”