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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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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 mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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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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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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Water-Soluble Poly(phosphonate)s via Living Ring-Opening Polymerization.

Tobias Steinbach1,2,3, Sandra Ritz2, Frederik R Wurm2

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Summary

Researchers developed novel water-soluble poly(phosphonate)s using a cyclic phosphonate monomer. This controlled polymerization yields narrow molecular weight distributions and non-toxic, highly soluble polymers.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Poly(phosphonate)s offer a stable carbon-phosphorus linkage for side chain attachment to degradable poly(phosphoester) backbones.
  • Developing water-soluble polymers with controlled properties is crucial for various applications.

Purpose of the Study:

  • To synthesize novel water-soluble aliphatic poly(ethylene methylphospho-nate)s using a new cyclic phosphonate monomer.
  • To investigate the polymerization kinetics and control over molecular weight distribution.
  • To characterize the resulting polymers and assess their properties, including solubility and non-toxicity.

Main Methods:

  • A three-step protocol was used to synthesize a novel cyclic phosphonate monomer.
  • Polymerization was initiated by a primary alcohol and mediated by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) at 0 °C.
  • Techniques including NMR spectroscopy, size exclusion chromatography, and differential scanning calorimetry were employed for characterization.

Main Results:

  • The developed three-step protocol for monomer synthesis is robust and scalable.
  • Polymerization proceeded rapidly (<2 h) under controlled conditions, yielding polymers with narrow molecular weight distributions (Đ < 1.1) up to 20000 g/mol, indicating living polymerization.
  • The resulting poly(phosphonate)s are highly water-soluble, exhibit no lower critical solution temperature, and are non-toxic to HeLa cells.

Conclusions:

  • A novel, easily scalable method for producing water-soluble poly(phosphonate)s with excellent control over molecular weight has been established.
  • The synthesized polymers demonstrate superior living polymerization behavior compared to previously reported poly(phosphate)s.
  • These highly water-soluble and non-toxic polymers hold promise for biomedical and other advanced material applications.