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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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Multiscale Microstructure, Composition, and Stability of Surfactant/Polymer Foams.

Stefania Perticaroli¹, Jana Herzberger¹, Yiping Sun¹

¹The Procter and Gamble Company, Research and Development, Mason Business Center, Cincinnati, Ohio 45040, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 24, 2020

Summary

Polymer additives like hydroxypropyl methylcellulose (HPMC) enhance foam stability by increasing film thickness. This study quantifies polymer incorporation and structural changes in sodium dodecyl sulfate (SDS)/HPMC foams.

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Area of Science:

Materials Science
Colloid and Surface Chemistry
Polymer Science

Background:

Polymer additives are used to improve foam stability.
Quantifying polymer incorporation and understanding structural changes in foams remain challenging.
Sodium dodecyl sulfate (SDS) and hydroxypropyl methylcellulose (HPMC) are common foam-forming agents.

Purpose of the Study:

To investigate the amount and retention of HPMC in SDS/HPMC foams.
To elucidate the structural modifications induced by HPMC in foam films.
To correlate structural changes with foam stability.

Main Methods:

Flow injection QTOF mass spectrometry to quantify HPMC-to-SDS ratio.
Small-angle neutron scattering (SANS) with contrast matching to analyze micellar structure and film thickness.
Foam stability measurements over time.

Main Results:

Mass spectrometry confirmed HPMC incorporation and retention in foam, with ratios matching the parent solution.
SANS revealed HPMC leads to thicker foam films and altered micellar structure.
Increased film thickness correlated with enhanced foam stability in the initial 15-20 minutes.

Conclusions:

Combined mass spectrometry and SANS provide a comprehensive understanding of SDS/HPMC foam structure and composition.
HPMC incorporation thickens films, improving short-term foam stability.
This approach offers mechanistic insights for rational foam design and formulation guidance.