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Determination of Molar Masses of Polymers I

Determination of Molar Masses of Polymers I

Polymerization produces macromolecules with a range of chain lengths due to the random nature of molecular growth processes. As chains form and terminate at different stages, a single polymer sample contains molecules of varying sizes rather than a uniform structure. This variability is described using average molar masses and distribution-related parameters, which together provide a comprehensive understanding of polymer characteristics.The distribution of molar masses plays a critical role in...

Determination of Molar Masses of Polymers II

Determination of Molar Masses of Polymers II

Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...

Polymers: Molecular Weight Distribution

Polymers: Molecular Weight Distribution

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.

Polymers: Defining Molecular Weight

Polymers: Defining Molecular Weight

Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight. So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...

Molecular Weight of Step-Growth Polymers

Molecular Weight of Step-Growth Polymers

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.
The extent of the...

Polymer Classification: Crystallinity

Polymer Classification: Crystallinity

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.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...

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Related Experiment Video

Updated: Jun 18, 2026

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry

Published on: June 10, 2018

Analyzing the molecular weight distribution in supramolecular polymers.

Stephan A Schmid¹, Robert Abbel, Albertus P H Schenning

¹Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.

Journal of the American Chemical Society

|November 13, 2009

Summary

Supramolecular polymerization forms linear polymer chains. A Flory distribution accurately models chain lengths, revealing a steplike growth process similar to covalent polycondensation reactions.

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Last Updated: Jun 18, 2026

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry

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MALDI-ToF MS Method for the Characterization of Synthetic Polymers with Varying Dispersity and End Groups

MALDI-ToF MS Method for the Characterization of Synthetic Polymers with Varying Dispersity and End Groups

Published on: October 3, 2025

Area of Science:

Supramolecular Chemistry
Polymer Science
Spectroscopy

Background:

Investigating supramolecular linear polymer chain formation.
Understanding the influence of formation on chain length distribution.

Purpose of the Study:

To explore excitation energy migration in supramolecular polymer chains.
To compare experimental data with Monte Carlo simulations for chain length distribution.

Main Methods:

Time-resolved photoluminescence (PL) spectroscopy to monitor energy transfer.
Monte Carlo simulations incorporating chain structure and transfer rates.
Testing various weight distribution functions (Flory, Poisson, monodisperse).

Main Results:

The Flory distribution assumption showed excellent agreement with experimental and simulated data.
Poisson and monodisperse distributions underestimated the presence of long chains.
Supramolecular polymerization follows a steplike process, akin to polycondensation.

Conclusions:

Supramolecular polymerization exhibits characteristics similar to linear covalent polymer polycondensation.
Equal reactivity of building blocks drives a dynamic chain growth process.