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Identifier

000419210

Title

Synthesis and characterization of acid- and photo-degradable star polymers

Alternative Title

Σύνθεση και χαρακτηρισμός οξινών και φωτο-διασπώμενων αστεροειδών πολυμερών

Author

Ηλιάδη, Νίκη

Thesis advisor

Βαμβακάκη, Μαρία

Reviewer

Χατζηνικολαϊδου, Μαρία
Χαρμανδάρης Ευάγγελος

Abstract

This Master Thesis focused on the synthesis and characterization of star polymers, specifically tailored to be acid- and photo-degradable. In order to achieve that, two novel cross-linkers were synthesized via acid-catalysed condensation reactions, that were later used for the synthesis of two different polymers each. The polymerization method employed for the synthesis of the star polymers was group transfer polymerization with an arm-first approach for all star polymers. The molecular weight of the polymers was determined by size exclusion chromatography, and their molecular structure was verified via 1H nuclear magnetic resonance spectroscopy. The size of the polymers was also measured with dynamic light scattering, and finally the polymers were imaged by scanning electron microscopy. Following their characterization, their degradation needed to be proven. Both cross-linkers were sensitive to a decrease in the pH value due to the characteristic acetal groups they carry, and their degradation after treatment with a hydrochloric acid solution was proven by size exclusion chromatography, nuclear magnetic resonance spectroscopy, as well as dynamic light scattering and scanning electron microscopy. One of the synthesized cross-linkers was also proven to be photo-degradable under irradiation at 254 nm, due to the aromatic groups it carries along with its characteristic acetal bonds. The photo-degradation of the star polymers was also proven using the same characterization techniques as described above.

Language

English

Subject

Acetals

Acid-degradation

Cross-linker

Όξινη διάσπαση

Ακετάλες

Issue date

2018-11-23

Collection

School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses