Propylene-Ethylene Copolymer Covalent Adaptable Networks Synthesized by Resonance-Stabilized, Radical-Based Reactive Processing with Excellent Elevated-Temperature Creep Resistance.

ABSTRACT: Low-crystallinity propylene-ethylene copolymer (PEC) thermoplastics exhibit creep in the melt and semicrystalline states. To enhance creep resistance while maintaining reprocessability, dynamic covalent cross-links are introduced through one-step, radical-based reactive processing to create covalent adaptable networks (CANs). During reactive processing, it is essential to suppress β-scission of propylene repeat units. To promote the formation of resonance-stabilized macroradical intermediates, a methacrylate-based cross-linker bis(4-methacryloyloxyphenyl) disulfide (BPMA) is replaced with a phenylacrylate-based cross-linker bis(4-phenacryloyloxyphenyl) disulfide (BPST) and styrene and divinylbenzene, vinyl aromatic additives, are incorporated. The use of BPST but not BPMA leads to percolat

SUBMITTER: Huang YW 

PROVIDER: S-EPMC12548940 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature