SEARCH · Search NASA
Results for “Polymer Science”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Fragmentation Kinetics of Block Copolymer Micelles: Effect of Core and Corona Block Lengths
Not provided.
Poly(Isoprene)-Block-Poly(Ethylene Oxide) Diblock Copolymer Toughened Polylactide
Not provided.
Effect of Ionomer–Solvent Interactions in PFSA Dispersions: Dispersion Morphology
Not provided.
Anisotropic and Interconnected Nanoporous Materials from Randomly End-Linked Copolymer Networks
Microphase separation within randomly end-linked copolymer networks (RECNs) provides access to disordered bicontinuous morphologies over a wide composition range of the constituent network strands. Here, we rely on end-linking of telechelic hydroxyl-terminated polystyrene (PS) and poly(D,Llactide) (PLA) chains of equal molecular weight, with a tetrafunctional isocyanate cross-linker in a good solvent for both strands, followed by solvent removal to induce microphase separation, and finally etching of the PLA phase to yield nanoporous materials. Transmission electron microscopy (TEM) tomographic reconstructed 3D images along with gravimetric measurements and small-angle X-ray scattering (SAXS) indicate the formation of highly interconnected structures over a range of ~40-70 vol % of PLA, while N2 adsorption measurements indicate narrowly distributed pore sizes that can be tuned by varying the strand molecular weights. Stretching of the PS/PLA copolymer networks above the glass transition temperatures of both components prior to etching the PLA phase provides a straightforward means to introduce controlled anisotropy into the 3D interconnected porous materials.
Interaction between Two Active Sites of the Same Catalyst for Macromonomer Enchained Olefin Polymerization
Not provided.
Predictive Tool for Design and Analysis of ARGET ATRP Grafting Reactions
Not provided.
Quantifying Lithium Salt and Polymer Density Distributions in Nanostructured Ion-Conducting Block Polymers
Not provided.
Engineering the Mechanical Behavior of Polymer Networks with Flexible Self-Assembled V-Shaped Monomers
Not provided.
Synthesis and Properties of N -Arylpyrrole-Functionalized Poly(1-hexene- alt -CO)
Not provided.