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MolPy: A Large Language Model-Friendly Toolkit for Reactive Topology Editing in Polymer Simulations
Jichen Li1, Fabian Schwarz1, Wentao Guo2
1Department of Chemistry-Ångström Laboratory, Uppsala University, 75121 Uppsala, Sweden.
Journal of Chemical Information and Modeling
|July 1, 2026
Summary
A new toolkit, MolPy, streamlines polymer modeling by integrating system construction and simulation workflows. This platform enhances automation and compatibility for advanced polymer research.
Area of Science:
- Polymer Science
- Computational Chemistry
- Materials Science
Background:
- Molecular modeling of synthetic polymers relies heavily on automation and diverse simulation tools.
- Current infrastructure for polymer system construction, modification, and parametrization is fragmented.
- Existing methods lack seamless integration, hindering efficient workflow orchestration.
Purpose of the Study:
- To introduce MolPy, an extensible and chemically intuitive toolkit for polymer system building and simulation workflow orchestration.
- To bridge the gap in practical infrastructure for polymer modeling.
- To facilitate streamlined and automated polymer modeling pipelines.
Main Methods:
- Developed MolPy with a modular architecture and clear separation of responsibilities.
- Implemented a stable and inspectable execution model.
- Ensured flexible extensions for new chemical building blocks and bonding schemes.
Main Results:
- MolPy automatically integrates new components into construction, topology generation, and force-field assignment.
- The toolkit supports interoperability with established simulation tools.
- MolPy enables automated polymer modeling workflows compatible with LLM-driven orchestration.
Conclusions:
- MolPy provides a unified platform for polymer system construction and simulation.
- The toolkit enhances efficiency and compatibility in polymer modeling workflows.
- MolPy is poised to support future advancements in automated and LLM-driven polymer research.
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Polymers
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 properties that they exhibit. Additionally,...
Polymers
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 properties that they exhibit. Additionally,...
Polymers
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 properties that they exhibit. Additionally,...

