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Updated: Jun 23, 2026

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Published on: June 30, 2018

pH-controlled polymer surface segregation.

Richard L Thompson¹, Sarah J Hardman, Lian R Hutchings

¹Department of Chemistry, Durham University, Science Site, Durham DH1 3LE, UK. R.L.Thompson@dur.ac.uk

Langmuir : the ACS Journal of Surfaces and Colloids

|May 14, 2009

Summary

This study shows how pH control influences polymer surface functionalization. Adjusting pH levels effectively directs the segregation of functional groups, offering new methods for surface modification.

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Area of Science:

Polymer Science
Surface Chemistry
Materials Science

Background:

Controlling polymer surface properties is crucial for advanced material applications.
Functional groups on polymers can alter surface characteristics, but precise control remains challenging.

Purpose of the Study:

To demonstrate a novel method for controlling polymer surface functionalization using pH buffering.
To investigate the pH-dependent surface segregation behavior of polymers with acidic or basic functional groups.

Main Methods:

Annealing blended polymer films under pH-buffered conditions.
Utilizing neutron reflectometry and nuclear reaction analysis to quantify surface excess.
Employing self-consistent field theory (SCFT) analysis for composition-depth profiling.

Main Results:

Surface segregation of carboxylic acid (COOH)-functionalized polystyrene significantly increases with rising pH (1.9 to 9.4).
Amine (NH2)-functionalized polystyrene exhibits inverse pH-dependent surface segregation.
The affinity of functional groups for the polymer surface shows a pH-driven change of approximately 3k(B)T.

Conclusions:

pH-buffered annealing is an effective strategy for promoting and controlling polymer surface functionalization.
The study provides quantitative insights into the pH-responsive behavior of polar functional groups at polymer surfaces.
This approach offers a pathway for designing materials with tailored surface properties.