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Coatings 2019, 9(3), 153; https://doi.org/10.3390/coatings9030153

Surface Segregation of Amphiphilic PDMS-Based Films Containing Terpolymers with Siloxane, Fluorinated and Ethoxylated Side Chains

1
Dipartimento di Chimica e Chimica Industriale and UdR Pisa INSTM, Università di Pisa, 56124 Pisa, Italy
2
Dipartimento di Scienze Chimiche, Università di Padova, 35131 Padova, Italy
*
Author to whom correspondence should be addressed.
Received: 29 January 2019 / Revised: 19 February 2019 / Accepted: 25 February 2019 / Published: 26 February 2019
(This article belongs to the Special Issue Surface Chemical Modification)
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Abstract

(Meth)acrylic terpolymers carrying siloxane (Si), fluoroalkyl (F) and ethoxylated (EG) side chains were synthesized with comparable molar compositions and different lengths of the Si and EG side chains, while the length of the fluorinated side chain was kept constant. Such terpolymers were used as surface-active modifiers of polydimethylsiloxane (PDMS)-based films with a loading of 4 wt%. The surface chemical compositions of both the films and the pristine terpolymers were determined by angle-resolved X-ray photoelectron spectroscopy (AR-XPS) at different photoemission angles. The terpolymer was effectively segregated to the polymer−air interface of the films independent of the length of the constituent side chains. However, the specific details of the film surface modification depended upon the chemical structure of the terpolymer itself. The exceptionally high enrichment in F chains at the surface caused the accumulation of EG chains at the surface as well. The response of the films to the water environment was also proven to strictly depend on the type of terpolymer contained. While terpolymers with shorter EG chains appeared not to be affected by immersion in water for seven days, those containing longer EG chains underwent a massive surface reconstruction. View Full-Text
Keywords: surface-active polymer; surface segregation; surface modification; amphiphilic polymer; polysiloxane; fluoropolymer; PEGylated polymer; X-ray photoelectron spectroscopy surface-active polymer; surface segregation; surface modification; amphiphilic polymer; polysiloxane; fluoropolymer; PEGylated polymer; X-ray photoelectron spectroscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Martinelli, E.; Guazzelli, E.; Glisenti, A.; Galli, G. Surface Segregation of Amphiphilic PDMS-Based Films Containing Terpolymers with Siloxane, Fluorinated and Ethoxylated Side Chains. Coatings 2019, 9, 153.

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