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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Thermomechanical activation achieving orthogonal working/healing conditions of nanostructured tri-block copolymer thermosets
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Probing transference and field-induced polymer velocity in block copolymer electrolytes
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One-Step Synthesis of Hierarchical, Bimodal Nanoporous Carbons via Co-templating with Bottlebrush and Linear Block Copolymers
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One-Pot Structure Direction of Large-Pore Co-Continuous Carbon Monoliths from Ultralarge Linear Diblock Copolymers
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Reorientation of Crystalline Block Copolymer Membranes by Phospholipid Hybridization
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Enhancing the Backbone Coplanarity of n-Type Copolymers for Higher Electron Mobility and Stability i
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Non-Covalent Interactions and Helical Packing in Thiophene-Phenylene Copolymers: Tuning Solid-State Ordering and Charge Transport for Organic Field-Effect Transistors
In this study, we introduce two thiophene-phenylene-thiophene (TPT) polymers designed to leverage noncovalent intramolecular interactions to regulate main-chain conformation and enhance solid-state ordering. By incorporating unsubstituted thiophene (T) or bithiophene (2T) units, we reveal striking divergence in the thermal, morphological, and optoelectronic properties of the resulting films, facilitated by these noncovalent interactions. Using a combination of computational and experimental approaches, we show that annealing yields remarkably different polymer conformations and, consequently, charge transport properties. TPT-T undergoes a significant structural transformation, adopting a more planar backbone conformation and a highly crystalline, edge-on molecular orientation. In contrast, the introduction of a single additional thiophene unit in TPT-2T leads to a more isotropic molecular orientation with a slight preference for face-on alignment, resulting in a heterogeneous film structure that hinders charge transport despite achieving tighter molecular packing. Remarkably, despite being composed of achiral components, TPT-2T develops chirality upon annealing, indicating the formation of a helical conformation. Organic field-effect transistor measurements reveal that the well-ordered alignment in annealed TPT-T films results in higher charge carrier mobility and a narrower distribution of mobility values than in TPT-2T. These findings provide critical insights into the structure−property relationships of conjugated polymers, offering guidance for optimizing molecular design and processing strategies for highperformance organic electronic materials.
Effect of Molecular Architecture on the Self-Assembly of Bottlebrush Copolymers
Not provided.
Tuning Cooperative Assembly with Bottlebrush Block Copolymers for Porous Metal Oxide Films Using Solvent Mixtures
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Microwave Processing Controls the Morphology of Block Copolymer-Templated Mesoporous Cobalt Oxide Films
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Three-Dimensional Spirals of Conjugated Block Copolymers Driven by Screw Dislocation
Abstract not provided
Connecting Solute Diffusion to Morphology in Triblock Copolymer Membranes
Not provided.