Atomic force microscopy characterization of polyethylene terephthalate grafting with poly(styrene sulfonate)

Polyethylene terephthalate (PET) is widely used to elaborate biomaterials and medical devices in particular for long-term implant applications but tuning their surface properties remains challenging. We investigate surface functionalization by grafting poly(sodium 4-styrene sulfonate, PNaSS) with th...

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Bibliographic Details
Published in:Nanotechnology 2022-05, Vol.33 (20), p.205702
Main Authors: Nguyen, Tuan Ngoc, Humblot, Vincent, Migonney, Véronique, Lévy, Raphaël
Format: Article
Language:English
Subjects:
Biocompatible Materials - chemistry
Chemical Sciences
Material chemistry
Microscopy, Atomic Force
peakforce quantitative nano-mechanical properties (PF-QNM)
Photoelectron Spectroscopy
poly(sodium 4-styrene sulfonate (PNaSS)
polyelectrolyte brushes
polyethylene terephthalate (PET)
Polyethylene Terephthalates - chemistry
Polymerization
Polymers - chemistry
Sulfonic Acids - chemistry
Surface Properties
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Summary:Polyethylene terephthalate (PET) is widely used to elaborate biomaterials and medical devices in particular for long-term implant applications but tuning their surface properties remains challenging. We investigate surface functionalization by grafting poly(sodium 4-styrene sulfonate, PNaSS) with the aim of enhancing protein adhesion and cellular activity. Elucidating the topography and molecular level organization of the modified surfaces is important for understanding and predicting biological activity. In this work, we explore several grafting methods including thermal grafting, thermal grafting in the presence of Mohr's salt, and UV activation. We characterize the different surfaces obtained using atomic force microscopy (AFM), contact angle (CA), and x-ray photoelectron spectroscopy (XPS). We observe an increase in the percentage of sulfur atoms (XPS) that correlates with changes in (CA), and we identify by AFM characteristic features, which we interpret as patches of polymers on the PET surfaces. This work demonstrates tuning of biomaterials surface by functionalization and illustrates the capability of AFM to provide insights into the spatial organization of the grafted polymer.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/ac50ef