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Related Concept Videos

Step-Growth Polymerization: Overview01:03

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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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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Polymers

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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...
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A robotic approach to polymerisation kinetics: a case study on copolymerisation parameter estimation.

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Summary
This summary is machine-generated.

This study presents an automated workflow for radical polymerization using the Opentrons OT-2 robot, enabling high-throughput experimentation and generating standardized datasets for predicting monomer reactivity ratios efficiently.

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Area of Science:

  • Polymer Chemistry
  • Chemical Engineering
  • Automation and Robotics

Background:

  • High-throughput (HTP) experimentation accelerates chemical discovery but is often limited by the high cost of robotic platforms.
  • Existing robotic platforms face challenges in specific applications like microliter-scale deoxygenation for radical polymerization.
  • The Opentrons OT-2 offers a cost-effective, open-source alternative for automated liquid handling.

Purpose of the Study:

  • To establish a robust, automated workflow for thermal radical polymerization using the Opentrons OT-2 in a 48-well format.
  • To overcome challenges in microliter-scale deoxygenation for HTP radical polymerization.
  • To generate standardized datasets for predicting reactivity ratios and advance data-driven polymer research.

Main Methods:

  • Development of a 48-well reactor system for thermal radical polymerization using the Opentrons OT-2.
  • Integration of custom 3D-printed components for automated NMR sample preparation.
  • Application of IUPAC-recommended evaluation methodology for kinetic studies and reactivity ratio determination.

Main Results:

  • Successful implementation of a reproducible HTP radical polymerization workflow on the OT-2.
  • Generation of standardized datasets for six monomer pairs, yielding precise reactivity ratios (e.g., BMA-BA: r1=2.22, r2=0.37).
  • Demonstration of rapid data generation (within hours) and elimination of experimental human bias.

Conclusions:

  • The Opentrons OT-2 is a practical and accessible tool for accelerating polymer research through automated HTP experimentation.
  • The established workflow enables systematic polymerisation studies and facilitates data-driven chemical discovery.
  • Standardized datasets generated by this system are crucial for accurate predictive modeling of copolymerization kinetics.