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Thesis-2005-Capra.pdf (11.47 MB)

Controlled release of antioxidants from silica hybrids

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thesis
posted on 2018-11-15, 11:58 authored by Carlo Capra
Ternary hybrids based on poly(ethylene oxide) (PEO)/silica (SiO2)/antioxidants (AO) were produced by the sol–gel method and evaluated as slow-release antidegradants for polyamide Nylon 6. An amount of 3-glycidyloxypropyltrimethoxysilane (GOTMS) was used to compatibilise the binary combination PEO-SiO2. The antioxidants evaluated were chosen from commercial sources representing both phenolic and amine classes of molecules. In particular the antioxidants evaluated in some depth were 3,5-di-tert-butyl-4-hydroxytoluene (BHT, the lowest molecular weight hindered phenol antioxidant), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate (Irganox 1076) (a higher molecular weight phenolic antioxidant), bis-(2,2,6,6-tetramethyl-4-piperidyl)-sebacate (Tinuvin 770, a sterically hindered secondary aliphatic amine stabiliser HAS), N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD, an aromatic amine antioxidant). [Continues.]

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Publisher

© Carlo Capra

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2005

Notes

A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of the degree of Doctor of Philosophy at Loughborough University.

Language

  • en

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