Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Polymers02:34

Polymers

40.9K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
40.9K
Polymers02:34

Polymers

23.3K
23.3K
Recycling Endosomes and Transcytosis00:58

Recycling Endosomes and Transcytosis

3.6K
The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route.
The recycling endosome is not a single organelle but an extensively tubulated network of recycling pathways. It functions in storing molecules or transporting them across...
3.6K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

11.1K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
11.1K
Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

1.6K
Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
1.6K
Cyclic Processes And Isolated Systems01:19

Cyclic Processes And Isolated Systems

3.5K
A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
In the case of a non-isolated system, the change in the internal energy is zero only if the process is cyclic. A thermodynamic process is considered cyclic if the system undergoes a series of changes and returns to its initial state. 
Consider a cyclic process that returns to its initial state, undergoing a four-step process. The heat transfer along each...
3.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Light-driven rheological modulation of solventless polymer networks enabled by precisely architected flexible star polysiloxanes.

Chemical communications (Cambridge, England)·2025
Same author

Conversion Mechanism of Front-Side Marangoni Convection to Droplet Motion in Continuously Moving Self-Propelled 1-Hexanol Droplet on an Aqueous Solution.

Langmuir : the ACS journal of surfaces and colloids·2025
Same author

Significant anisotropic deformation and optical shifts in stretched cholesteric liquid crystal elastomers.

Soft matter·2024
Same author

Synergetic binary organocatalyzed ring opening polymerization for the precision synthesis of polysiloxanes.

Communications chemistry·2024
Same author

Magnetic Supramolecular Spherical Arrays: Direct Formation of Micellar Cubic Mesophase by Lanthanide Metallomesogens with 7-Coordination Geometry.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2024
Same author

Flow-Driven Self-Propulsion of Oil Droplet on a Surfactant Solution Surface, as Observed by Time-Resolved Interfacial Tension and Surface Flow Speed Measurements.

Langmuir : the ACS journal of surfaces and colloids·2024

Related Experiment Video

Updated: Feb 3, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

8.5K

Topology-Reset Execution: Repeatable Postcyclization Recyclization of Cyclic Polymers.

Satoshi Honda1, Minami Oka1, Hideaki Takagi2

  • 1Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan.

Angewandte Chemie (International Ed. in English)
|October 25, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel photostimulation method called topology-reset execution (T-rex) to repeatedly transform cyclic polymers into linear ones. This technique allows for tunable material properties and molecular weight control in poly(dimethylsiloxane)s.

Keywords:
cyclic polymersmacromolecular architecturesphotochemistrypolymersrheology

More Related Videos

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
10:22

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

3.9K
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.9K

Related Experiment Videos

Last Updated: Feb 3, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

8.5K
Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
10:22

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

3.9K
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.9K

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Modulating polymer functions through repeatable topological transformations remains a significant challenge in materials science.
  • Controlling macromolecular architecture is key to designing advanced materials with tailored properties.

Purpose of the Study:

  • To develop a photostimulation-based method for repeatedly transforming cyclic polymer architectures into linear ones.
  • To demonstrate the ability to modulate polymer molecular weight and rheological properties using this new technique.

Main Methods:

  • Synthesis of cyclic poly(dimethylsiloxane)s (PDMS) incorporating hexaarylbiimidazole (HABI) moieties.
  • Photochemical transformation using UV irradiation to induce ring-opening and generate linear polymers with specific end groups.
  • Utilizing ultrasound to induce site-specific cleavage and subsequent phototriggered topology-reset execution (T-rex) for molecular weight resetting.

Main Results:

  • UV irradiation successfully converted cyclic PDMS into linear PDMS with triphenylimidazolyl radical (TPIR) end groups.
  • End-to-end recyclization was achieved via TPIR recoupling after UV termination.
  • Ultrasound treatment decreased molecular weight through HABI cleavage, with T-rex enabling molecular weight reset.
  • Solvent-free switching of rheological properties was demonstrated while maintaining the liquid nature of PDMS.

Conclusions:

  • The phototriggered topology-reset execution (T-rex) method offers a repeatable way to transform cyclic polymers to linear architectures.
  • This approach provides precise control over molecular weight and rheological properties, enabling dynamic material function modulation.
  • T-rex facilitates solvent-free property switching, highlighting its potential for advanced polymer applications.