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Novel polymeric surfactants to stabilise emulsions

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Title: Novel polymeric surfactants to stabilise emulsions
Authors: Somuncuoglu, Birsen
Item Type: Thesis or dissertation
Abstract: This PhD project aims to synthesise polymeric surfactants, characterise their aqueous solution properties and emulsifying abilities, and obtain a structure-property relationship. In this study, different polymeric surfactants were synthesised using Group Transfer Polymerisation (GTP) method. The first project of this PhD thesis includes the synthesis of two series of diblock copolymers and the characterisation of their aqueous solution properties and emulsifying abilities. In order to make a comparison between the two-polymer series, the molar mass (MM), composition and hydrophobic monomer kept the same, whereas different hydrophilic monomer used for each polymer series. Thus, in both series, ethyl methacrylate (EtMA) was used as a hydrophobic monomer, and poly(ethylene glycol) methyl ether methacrylate (PEGMA) and 2-(dimethylamino) ethyl methacrylate (DMAEMA) was used as a hydrophilic monomer in Polymer series 1 and 2, respectively. The second project of this PhD thesis includes the synthesis of triblock copolymers using the same monomers studied in the previous project; PEGMA, EtMA and DMAEMA. The architecture of the linear triblock copolymers is ABC (A is PEGMA, B is EtMA, and C is DMAEMA), and it kept the same in the whole project. Moreover, the MM and composition of the copolymers kept the same as with the previous chapter to observe the effects of diblock and triblock copolymers on their properties. The third project of this PhD thesis includes the synthesis of seven different architecture of copolymers varying from statistical to gradient, diblock, triblock copolymers. The copolymers were based on hydrophilic DMAEMA and hydrophobic n-butyl methacrylate units. The MM and composition kept constant to observe the effect of architecture on the emulsifying and aqueous solution properties. It was found that the all the polymers were successfully synthesised and the effective pKa (if any), cloud points, critical micelle concentrations (CMC) and hydrophile-lipophile balance (HLB) values, and hydrodynamic diameters were affected by the structure of the polymers, such as composition and MM. Most importantly, all polymeric surfactants were found to emulsify methyl laurate in water, and the stability of the emulsions was found to strongly depend on the architecture, composition and MM of the polymers.
Content Version: Open Access
Issue Date: Jun-2021
Date Awarded: Oct-2021
URI: http://hdl.handle.net/10044/1/100413
DOI: https://doi.org/10.25560/100413
Copyright Statement: Creative Commons Attribution NonCommercial Licence
Supervisor: Georgiou, Theonitsa
Sponsor/Funder: Imperial College London
Engineering and Physical Sciences Research Council (EPSRC)
Funder's Grant Number: MMAC F48087
Department: Materials
Publisher: Imperial College London
Qualification Level: Doctoral
Qualification Name: Doctor of Philosophy (PhD)
Appears in Collections:Materials PhD theses

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