A team from the Johnson lab identify a design strategy that enables bifunctional scissile motifs to successfully toughen end-linked networks by establishing a topological correspondence between pendant cross-linked and end-linked architectures. This work establishes strand continuity as a mechanochemical design principle for fracture resistant materials across diverse polymer architectures. Article Link

A team from the Kulik lab reports the computational discovery of a new class of Cu2+ complex mechanophores comprising two tridentate scorpionate ligands that reversibly switch from octahedral to square-planar coordination under mechanical load. This work establishes coordination switching as a useful design strategy for mechanophores and demonstrates how high-throughput ab initio screening and ML can enable data-driven discovery of force-responsive polymer building blocks. Ar

A team from the Johnson, Olvera de la Cruz, Kulik, and Craig labs demonstrate that embedding a small fraction of force-sensitive mechanophores as cross-links into common polymers produces materials with substantially enhanced ballistic energy dissipation. This establishes a design principle for converting commodity polymers into impact-resilient materials and open directions at the intersection of polymer mechanochemistry and extreme-strain-rate material behavior. Article Lin

A team from the Olvera de la Cruz lab, with collaborators at UCSD, Duke, and Johns Hopkins, combine small-angle neutron and X-ray scattering and analytical measurements with extensive all-atom and coarse-grained molecular dynamics simulations to examine the structure and dynamics of the polymer network within the crystalline framework of ferritin- Polymer-Integrated Protein Crystals (PIX). Article Link

A team from the Olsen lab presents a new coarse-grained fracture simulation approach, which models repulsive interactions within a network as a mean-field excluded volume (EV) potential and eliminates the need for imposed deformation along nontensile axes. Article Link

A team from the Olsen and Craig labs introduce an addition to BigSMILES that represent topological interactions in macromolecules. This notation appends optional topological bond descriptors and associated indices, enabling the annotation of complex molecular architectures. The progression from BigSMILES to Topological BigSMILES highlights the potential for this framework to be used in representing broader classes of soft materials systems. Article Link

A team from the Steinmetz and Craig labs assess recent advances in stability optimization to improve the functionality of virus-based nanoparticles and derived materials, considering engineering strategies that target the external and internal surfaces, as well as the interfaces between coat protein subunits. Article Link

This Perspective from the MONET team highlights how new molecule-to-material relationships in polymer networks are simultaneously advancing the field of polymer chemistry and uncovering fundamental principles that extend beyond polymer systems, enriching our broader understanding of reactivity, structure, and bonding in complex materials. Article Link

A team from the Johnson, Olsen, Kulik, and Craig labs report a class of force-responsive molecules—tetrafunctional cyclobutanes (TCBs)—that enable the synthesis of single-network end-linked gels with substantially decreased or increased toughness, including unusually high toughness for dilute end-linked gels, with no other changes to network composition. TCB mechanophores and the corresponding concepts of stress-selective force-coupled reactivity and strand continuity offer d

A team from the Nelson and Craig labs use a 1 : 1 substitution of cyclobutane-based mechanophores as scissile covalent crosslinks in 3D printed poly(methoxyethylacrylate) networks to enhance the material toughness without compromising stiffness. These crosslinkers increased the material's toughness in tensile and tearing tests without altering its stiffness or appearance, suggesting that mechanophores offer a promising route to toughen 3D printed elastomers. Article Link

A team from the Moore lab presents a systematic workflow aimed at facilitating the design and discovery of new mechanophores. By integrating the classic iso-metrical CoGEF approach with the iso-tensional Tension Model of Bond Activation (TMBA) simulation, the workflow enables comprehensive evaluation of mechanophore candidates prior to experimental implementation for efficient identification and filtering away of unexpected issues while providing insights for potential struct

A team from the Steinmetz lab developed a viral NanoSponge formulation that enables the noncovalent loading of agrochemicals but prevents premature release through metal–phenolic network (MPN) coatings. The NanoSponge platform represents a sustainable and effective strategy for precision farming, effectively addressing deep soil pests. Article Link

A team from the Olsen and Rubinstein labs, in collaboration with others at University of Campinas and University of South Florida, extend BigSMILES to accommodate nonatomic particles, enabling it to represent coarse-grained models of polymers in a manner directly analogous to atomic structures. The new syntax coarse-grained BigSMILES (CG-BigSMILES) combines a layer-based annotation with linking to force field files to capture both chemical structures and interacting potential

A team from the Olvera de la Cruz and Campos labs develop a mean-field framework that connects microscopic bond reactions and molecular packing-induced conformational changes to macroscopic elastic behavior. The work provides a predictive platform for designing responsive and adaptive polymer networks with tailored properties. Article Link

A team from the Craig, Rubinstein, Sottos, and Gong labs report the impact of fused ring size in bicyclic cyclobutane mechanophores within the strands of polymer network gels. They observe the first evidence of covalent reactive strand extension (RSE) effects in a single-network gel, and strands with greater RSE lead to gels with greater stretchability and toughness. Article Link

A team from the Kulik and Craig labs report the computational, machine learning guided discovery of synthesizable ferrocene mechanophores. The work establishes a generalizable framework for the high-throughput discovery and rational design of mechanophores and offers insights into structure–activity relationships in mechanically responsive materials. Article Link

A team from the Kalow and Olvera de la Cruz labs establish rheological isotope effects (RIEs) as a new tool for studying dynamic covalent exchange in bulk networks. RIEs present new opportunities to study mechanisms of exchange in bulk networks, deconvolute modes of stress relaxation in complex CANs, and provide insight into the impact of defects on viscoelasticity. Article Link

Craig and Rubinstein discuss how reducing the crosslink density in highly entangled natural rubber increases its crack resistance and prolongs its useful life. Article Link

A team from the Gong and Rubinstein labs report demonstrate how weak bonds can be leveraged to achieve self-strengthening in polymer network materials. These weak sacrificial bonds trigger mechanochemical reactions, forming new networks rapidly enough to reinforce the material during deformation and significantly improve crack resistance. Article Link

A team from the Klausen, Nelson, Kulik, and Craig labs report a novel chemical design for accelerated mechanochemical bond scission based on replacing a single carbon atom in a crosslinker with a silicon atom. They show seamless incorporation of these scissile carbosilanes to toughen 3D-printed networks, which demonstrates their suitability for additive manufacturing processes. Article Link