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Bioinspired ordered polymer-composites

Shi, Y; (2017) Bioinspired ordered polymer-composites. Doctoral thesis , UCL (University College London). Green open access

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Abstract

In this project, clays including montmorillonite, laponite, Black Hills bentonite as well as kaolinite were used to fabricate the layered structure of nacre. A solution casting method was used to build the hierarchical nacre-like composite and in-situ photo polymerisation, vacuum impregnation and vacuum assisted filtration methods were employed for preformed clay sheets and polymers (methyl methacrylate, tri(ethyleneglycol) dimethacrylate, poly(propylene glycol) dimethacrylate as well as epoxy resin) to mimic the structure of nacre. XRD was used to indicate the intercalation of polymer and orientation function of clay sheets and SEM for microstructure detection. Tensile testing was used to investigate the properties of different volume fraction (40-70 vol. %) composites and the highest value 98 MPa came from 50 vol. % MMT/PVA composite. The mechanism of polymerisation of acrylic groups with clays present was analysed and redox polymerisation was introduced for the kaolinite/PMMA system. Kaolinite/ PMMA samples were tested via three points loading and a composite with flexural strength of (40 ± 20) MPa and flexural modulus of (30 ± 20) GPa was obtained.

Type: Thesis (Doctoral)
Title: Bioinspired ordered polymer-composites
Event: UCL
Open access status: An open access version is available from UCL Discovery
Language: English
Keywords: clay, ordered structure
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1545259
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