Extrudable and Highly Creep-Resistant Covalent Adaptable Networks Made from Polyethylene and Ethylene/1-Octene Copolymers by Reactive Processing with Aromatic Disulfide Cross-Links

ACS Applied Polymer Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 3, 2024

Polyolefins like polyethylene (PE) and ethylene-based copolymers are widely used in consumer industrial applications due to their versatility, the diversity tunability of properties, theoretical recyclability at elevated temperatures. However, recycling rates markedly low, and, though cross-linking PE enhances its properties through creation a networked architecture, resulting thermoset known as PEX is rendered completely unrecyclable. Incorporating associative or dissociative dynamic covalent bonds cross-links into plastics promising route both make use spent (via "upcycling" them) generate recyclable alternatives unrecyclable thermosets PEX. Such materials adaptable networks CANs (also called vitrimers if exclusively associative). Here, we present method for imbuing polymers with aromatic disulfide cross-links, robust, reprocessable CANs. Radical-based reactive processing ethylene/1-octene-based 1 wt % dicumyl peroxide 5 bis(4-methacryloyloxyphenyl) (BiPheS methacrylate BPMA) successfully resulted which fully recovered cross-link densities associated thermomechanical after multiple reprocessing cycles. These demonstrate remarkable elevated-temperature creep resistance high-temperature thermal stability high temperatures required exchanges BiPheS-based cross-links. copolymer also enable (re)processability via extrusion temperatures, property recovery demonstrated 260 °C, thereby indicating feasibility extending our approach scales processes well other rigorous applications.

Язык: Английский

Reprocessable Polypropylene Covalent Adaptable Networks via Free-Radical Reactive Processing with Vinyl Aromatic Additives

Macromolecules, Год журнала: 2025, Номер unknown

Опубликована: Апрель 23, 2025

Язык: Английский