Johann L. Rapp

ORCID: 0009-0009-9294-0043
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About
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Research Areas
  • Advanced Polymer Synthesis and Characterization
  • Innovative Microfluidic and Catalytic Techniques Innovation
  • Cellular Mechanics and Interactions
  • Advanced Sensor and Energy Harvesting Materials
  • Polymer composites and self-healing
  • biodegradable polymer synthesis and properties
  • Photopolymerization techniques and applications

University of North Carolina at Chapel Hill
2022-2025

Connecting polymer synthesis and processing is an important challenge for streamlining the manufacturing of polymeric materials. In this work, automated acrylate-capped polyurethane oligomers integrated with vat photopolymerization 3D printing. This strategy enabled rapid a library polyurethane-based elastomeric materials differentiated thermal mechanical properties. The semicontinuous batch approach proved enabling resins otherwise short shelf lives because intimate connection between...

10.1021/acspolymersau.3c00033 article EN cc-by-nc-nd ACS Polymers Au 2024-01-26

The development of high-performance elastomers for additive manufacturing requires overcoming complex property trade-offs that challenge conventional material discovery pipelines. Here, a human-in-the-loop reinforcement learning (RL) approach is used to discover exceptional polyurethane overcome pervasive stress–strain tradeoffs. Starting with diverse training set 92 formulations, coupled multi-component reward system was identified guides RL agents toward materials both high strength and...

10.26434/chemrxiv-2025-w1563 preprint EN cc-by-nc-nd 2025-03-24

To migrate efficiently through tissues, cells must transit small constrictions within the extracellular matrix. However, in vivo environments are geometrically, mechanically, and chemically complex, it has been difficult to understand how each of these parameters contribute propulsive strategy utilized by diverse settings. address this, we employed a sacrificial micromolding approach generate polymer substrates with tunable stiffness, controlled adhesivity, user-defined microscale...

10.1101/2024.09.27.615466 preprint EN cc-by-nc-nd bioRxiv (Cold Spring Harbor Laboratory) 2024-09-30

A broadly applicable approach to oxygen tolerant RAFT polymerization is reported by leveraging the synergistic combination of two radical initiators provide temporal control over flux during polymerization.

10.1039/d2py00603k article EN Polymer Chemistry 2022-01-01
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