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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Actin Polymerization01:42

Actin Polymerization

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Nanostructuring Single-Molecule Polymeric Nanoparticles via Macromolecular Architecture.

Petra Bačová, Emmanouil Glynos, Spiros H Anastasiadis

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    Summary

    We simulated polymer nanoparticles made of poly(ethylene oxide) (PEO) and polystyrene (PS) arms. Their structure, resembling Janus or patchy particles, depends on arm number and environment, offering design potential for new materials.

    Keywords:
    atomistic simulationsintramolecular nanosegregationmikto-arm copolymer starsparticle designpolymeric nanoparticles

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    Area of Science:

    • Polymer Science
    • Materials Science
    • Nanotechnology

    Background:

    • Heterogeneous polymer nanoparticles offer diverse applications.
    • Single-molecule nanoparticles exhibit complex internal structures.

    Purpose of the Study:

    • To investigate structural heterogeneities in nanostructured single-molecule nanoparticles.
    • To analyze the influence of arm number, length, and environment on particle morphology.

    Main Methods:

    • Atomistic molecular dynamics simulations were employed.
    • Simulations focused on mikto-arm star copolymers with poly(ethylene oxide) (PEO) and polystyrene (PS) arms.

    Main Results:

    • Immiscibility of PEO and PS arms leads to intramolecular nanostructuring.
    • Particle morphology varies between Janus-like and patchy-like structures.
    • Heterogeneity increases with more arms and lower affinity to the host medium.

    Conclusions:

    • The internal structure and spatial arrangement of arms were analyzed.
    • Results guide the design of heterogeneous nanoparticles with distinct properties for advanced applications.