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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth 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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
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Size-Exclusion Chromatography01:08

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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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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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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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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Quantitative Analysis of Step-Growth Polymers by Size Exclusion Chromatography.

Josef Brandt1,2, Naomi L Haworth3, Friedrich Georg Schmidt4

  • 1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany.

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|May 26, 2022
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This study introduces a new size exclusion chromatography method to track step-growth reactions, enabling accurate molar mass determination and kinetic analysis for Diels-Alder polymers. The research confirms a first-order reaction with a 33 kJ mol⁻¹ activation energy.

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Area of Science:

  • Polymer Chemistry
  • Chemical Kinetics
  • Analytical Chemistry

Background:

  • Step-growth polymerization kinetics are crucial for material properties.
  • Accurate molar mass determination is essential for polymer characterization.
  • Diels-Alder chemistry offers reversible polymer formation and degradation.

Purpose of the Study:

  • To develop an advanced analysis protocol for quantitatively studying step-growth reactions.
  • To address challenges in molar mass calibration and signal overlap in size exclusion chromatography.
  • To derive kinetic parameters for Diels-Alder polymer depolymerization.

Main Methods:

  • Utilized size exclusion chromatography (SEC) for quantitative analysis.
  • Applied SEC to study the depolymerization of a Diels-Alder polymer (furan/maleimide).
  • Developed methods to overcome molar mass calibration issues and monomer-solvent signal overlap.

Main Results:

  • Successfully determined reliable molar masses for the depolymerizing polymer.
  • Derived kinetic parameters, including rate coefficients, without additional spectroscopic methods.
  • Confirmed first-order kinetic behavior for the retro-Diels-Alder (rDA) reaction.

Conclusions:

  • The advanced SEC protocol provides a robust method for kinetic analysis of step-growth reactions.
  • The study quantifies the depolymerization kinetics of a specific Diels-Alder polymer.
  • The derived activation energy for the rDA reaction is 33 kJ mol⁻¹.