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A polymer coating autonomously reports damageviafluorescence from a force-induced retro-Diels–Alder reaction. The optical signal correlates with impact energy, enabling real-time, equipment-free damage detection, even in pigmented coatings. 

Integrating mechanophores into multiple-network elastomers enables 20-fold toughness enhancement and 37% activation and provides insights into the toughening mechanismviabond scission visualization. 

The consumption of synthetic polymers has ballooned; so has the amount of post-consumer waste generated. The current polymer economy, however, is largely linear with most of the post-consumer waste being either landfilled or incinerated. The lack of recycling, together with the sizable carbon footprint of the polymer industry, has led to major negative environmental impacts. Over the past few years, chemical recycling technologies have gained significant traction as a possible technological route to tackle these challenges. In this regard, olefin metathesis, with its versatility and ease of operation, has emerged as an attractive tool. Here, we discuss the developments in olefin-metathesis-based chemical recycling technologies, including the development of new materials and the application of olefin metathesis to the recycling of commercial materials. We delve into structure–reactivity relationships in the context of polymerization–depolymerization behavior, how experimental conditions influence deconstruction outcomes, and the reaction pathways underlying these approaches. We also look at the current hurdles in adopting these technologies and relevant future directions for the field. 

Graft polymers with various sidechain lengths and grafting densities are prepared usingtrans-cyclobutane-fused cyclooctene macromonomers; the solvent-free depolymerization of these graft polymers in the presence of a ruthenium catalyst is studied. 

Graft polymers are gaining increasing interest because of their unique architectural characteristics. We recently reported a novel type of depolymerizable graft polymer based on poly(trans-cyclobutane fused cyclooctene), in an effort to address the trade-off between depolymerizability and controlled grafting-through polymerization. In this work, we examine the thermal, mechanical, and morphological properties of a graft copolymer thermoplastic material prepared by copolymerizing poly(L-lactide) and margaric acid-based macromonomers. A copolymerization kinetics study reveals that the two macromonomers are incorporated almost randomly and that the domain spacing measured from small-angle X-ray scattering is consistent with the random distribution. An investigation of the crystallization behavior suggests that proper thermal treatment is required to maximize, or to even observe crystallinity. The physical states of the soft and hard domains, whether melt, glassy, or semicrystalline, significantly impact the tensile properties of the resulting copolymer materials. Finally, the rheological properties and morphological features are discussed. 

Using ai-GCMC simulations,operandoWAXS, and kinetics analysis, we found that the high-rate performance of Sb as an alloy anode in Na-ion batteries is due to the presence of an amorphous intermediate phase formed during sodiation and desodiation.