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Anionic ring-opening polymerization of 2-oxabicyclo[2.1.1]hexan-3-one: manipulating topology and conformation for circular polymer design.
ChemSusChem
January 2025
Peking University, Chemistry, 292 Chengfu Rd, 100871, Beijing, CHINA.
Polyesters featuring a linear topology and in-chain 1,3-cyclobutane rings, synthesized via ring-opening polymerization (ROP) of 2-oxabicyclo[2.1.1]hexan-3-one (4R-BL, R = Bu, Ph) through a coordination-insertion mechanism, display excellent thermal and hydrolytic stability, making them promising candidates for sustainable circular materials.
View Article and Find Full Text PDFSingle-Crystal-to-Single-Crystal Synthesis of a Polymer in Two Distinct Topologies.
Angew Chem Int Ed Engl
January 2025
IITH: Indian Institute of Technology Hyderabad, Chemistry, Kandi, Sangaredddy, 502285, INDIA.
A squaramide-based monomer, designed for topochemical azide-alkyne cycloaddition (TAAC) polymerization, crystallizes as two polymorphs, M1 and M2, both having crystal packing suitable for topochemical polymerization. The hydrogen-bonding between squaramide units bias the molecular organization in both the polymorphs. 3D packing of H-bonded stacks of monomer lead to juxtaposition of azide and alkyne units of adjacent molecules in a transition-state-like arrangement for their regiospecific cycloaddition reaction.
View Article and Find Full Text PDFAntifouling Zwitterionic Polymer Coatings for Blood-Bearing Medical Devices.
Langmuir
January 2025
Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.
Blood-bearing medical devices are essential for the delivery of critical care medicine and are often required to function for weeks to months. However, thrombus formation on their surfaces can lead to reduced device function and failure and expose patients to systemic thrombosis risks. While clinical anticoagulants reduce device related thrombosis, they also increase patient bleeding risk.
View Article and Find Full Text PDFSpiral and helical formation of passive and active polymers with stiffness heterogeneity in a spherical cavity.
Soft Matter
January 2025
College of Chemistry, Sichuan University, Chengdu 610064, China.
Biomolecules usually adopt ubiquitous circular structures which are important for their functionality. Based on three-dimensional Langevin dynamics simulations, we investigate the conformational change of a polymer confined in a spherical cavity. Both passive and active polymers with either homogeneous or heterogeneous stiffness are analyzed in a comparative manner.
View Article and Find Full Text PDFLight-Induced Transformation from Covalent to Supramolecular Polymer Networks.
ACS Macro Lett
January 2025
School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
Stimuli-responsive polymers have demonstrated significant potential in the development of smart materials due to their capacity to undergo targeted property changes in response to external physical or chemical stimuli. However, the scales of response in most existing stimuli-responsive polymer systems are mainly focused on three levels: functional units, chain conformations, or polymer topologies. Herein, we have developed a covalent polymer network (CPN) capable of converting into a supramolecular polymer network (SPN) within bulk materials directly at the scale of polymer network types.
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