Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582573
Title: Grafting ε-caprolactone from the surface of polysaccharide nanocrystals : towards the preparation of nanocomposites from nature
Author: Labet, Marianne
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2012
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Abstract:
The objective of the work reported in this manuscript was to contribute to the reduction of the amount of non-biodegradable waste. The approach chosen was the possibility to add value to the biomass while making fully biodegradable nanocomposites from polysaccharide nanocrystals and biodegradable polymers. This was achieved by initiating polymer chains from the surface of polysaccharide nanocrystals. The first part of this manuscript, encompassing chapters 1 & 2, deals with the state of the art of polysaccharide-based materials. In chapter 1, composite materials are defined, polysaccharides of interest introduced and polysaccharide-based composites described. In chapter 2, the attention is brought to the case of polysaccharides/polycaprolactone composites and a detailed description of their preparation is given. The second part, regrouping chapters 3 & 4, summarizes the experimental aspect of the work carried out. Materials, equipment, methods and characterization techniques are described. The third part of this thesis describes the work that was done on starch nanocrystals. It embraces chapters 5 to 7. In Chapter 5, starch nanocrystals are presented. Chapter 6 details the results obtained when metal-based compounds are used as a catalyst for the SI- ROP of s-caprolactone from starch nanocrystals. Chapter 7 demonstrates that organic acids are better catalysts for this reaction. The fourth and final part of the manuscript, including chapters 8 to 10, describes the results obtained with cotton nanocrystals as a substrate. Chapter 8 gives details about the unmodified cotton nanocrystals and explains how cotton-g-PCL nanocrystals should theoretically look. Chapter 9 demonstrates that a purification stage is necessary to remove all adsorbed impurities at the surface of freshly prepared nanocrystals. Chapter 10 deals with the optimization of the SI-ROP of s-caprolactone from cotton nanocrystals when citric acid is used as a catalyst and characterizes a range of cotton-g-PCL samples with various amounts of PCL.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.582573  DOI: Not available
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