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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 Chain-Growth Polymerization: Overview01:17

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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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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Synthesis and characterization of functionally gradient materials obtained by frontal polymerization.

Daniele Nuvoli1, Valeria Alzari, John A Pojman

  • 1Dipartimento di Chimica e Farmacia, Università di Sassari , Local INSTM Unit, Via Vienna 2, 07100 Sassari, Italy.

ACS Applied Materials & Interfaces
|January 23, 2015
PubMed
Summary

Frontal polymerization (FP) enables precise synthesis of gradient materials. This method allows controlled property changes, crucial for advanced applications, overcoming previous limitations in gradient control.

Keywords:
copolymerfrontal polymerizationfunctionally gradient materialglass transition temperaturemechanical propertiespolyacrylateshore A hardnessswelling ratio

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Functionally gradient materials (FGMs) offer tunable properties for diverse applications.
  • Precise control over gradient characteristics, especially nonlinear ones, remains a significant challenge in FGM synthesis.

Purpose of the Study:

  • To explore frontal polymerization (FP) as a method for synthesizing polymeric FGMs.
  • To demonstrate the capability of programmed gradient control using ascending FP with continuous monomer feeding.

Main Methods:

  • Utilized ascending frontal polymerization with computer-controlled peristaltic pumps for continuous monomer feeding.
  • Synthesized gradient copolymers from triethylene glycol dimethacrylate/hexyl methacrylate with linear and hyperbolic gradients.
  • Characterized material properties (DSC, hardness, compression, swelling) along the gradient length.

Main Results:

  • Successfully prepared polymeric FGMs with programmed linear and hyperbolic gradients.
  • Differential scanning calorimetry (DSC) revealed glass transition temperatures linearly dependent on composition, matching theoretical predictions.
  • Other material properties exhibited unique, gradient-specific behaviors.

Conclusions:

  • Ascending frontal polymerization provides an effective route for fabricating FGMs with controlled compositional gradients.
  • The synthesized FGMs demonstrate predictable property variations linked to their programmed gradients.
  • This technique offers a pathway for developing advanced materials with tailored functionalities.