Related Experiment Video
Updated: Aug 15, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
Coupling between helix-coil and coil-globule transitions in helical polymers
Vikas Varshney1, Gustavo A Carri
1The Maurice Morton Institute of Polymer Science, The University of Akron, Ohio 44325-3909, USA.
This study reveals a complex relationship between helical polymer transitions, showing diverse states from helix to various globules. Understanding these polymer configurations is key for materials science.
Area of Science:
- Polymer Physics
- Computational Chemistry
- Statistical Mechanics
Background:
- Helical polymers exhibit complex phase transitions.
- Understanding the interplay between different conformational states is crucial for predicting polymer behavior.
Purpose of the Study:
- To investigate the coupling between helix-coil and coil-globule transitions in helical polymers.
- To map the state diagram and characterize distinct conformational states.
Main Methods:
- Utilizing Monte Carlo simulations to model polymer behavior.
- Analyzing the order parameter and other relevant properties to understand transitions.
Main Results:
- A rich state diagram was discovered, illustrating diverse polymer configurations.
- Identified states include helix, random coil, amorphous globule, and globular states with residual helical strands.
- Characterized the boundaries between these distinct conformational states.
Conclusions:
- The coupling of helix-coil and coil-globule transitions leads to a complex phase behavior in helical polymers.
- The findings provide insights into the fundamental physics governing polymer chain conformations and transitions.
Related Concept Videos
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
¹H NMR: Long-Range Coupling
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Spin–Spin Coupling: One-Bond Coupling
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
NMR Spectroscopy: Spin–Spin Coupling

