Boccarusso, Luca (2017) On the manufacturing techniques of lightweight hemp-epoxy composites and improvement of their flame resistance. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: On the manufacturing techniques of lightweight hemp-epoxy composites and improvement of their flame resistance
Creators:
CreatorsEmail
Boccarusso, Lucaluca.boccarusso@unina.it
Date: 10 April 2017
Number of Pages: 130
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Chimica, dei Materiali e della Produzione Industriale
Dottorato: Ingegneria dei prodotti e dei processi industriali
Ciclo di dottorato: 29
Coordinatore del Corso di dottorato:
nomeemail
Mensitieri, Giuseppemensitie@unina.it
Tutor:
nomeemail
Memola Capece Minutolo, FabrizioUNSPECIFIED
Date: 10 April 2017
Number of Pages: 130
Uncontrolled Keywords: Biocomposites; hemp; epoxy; flame resistance; APP; composite manufacturing; infusion; mechanical characterization
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/16 - Tecnologie e sistemi di lavorazione
Date Deposited: 25 Apr 2017 17:35
Last Modified: 08 Mar 2018 13:38
URI: http://www.fedoa.unina.it/id/eprint/11767
DOI: 10.6093/UNINA/FEDOA/11767

Abstract

The thesis work has been focused on the study of manufacturing technologies used to produce lightweight hemp/epoxy composites for their future applications as lightweight components, such as in the transportation industry. In this field, apart from the mechanical properties, good flame resistance is also required and then to increase the flame resistance of these components was another goal of this thesis. For this purpose, woven hemp fabrics with large mesh were used to produce porous structures and then lightweight hemp/epoxy composites for their future application both as independent structural components and as core for sandwich structures. The thesis work is structured in the following six sections. The first one begins with an overview on the state of the art of the hemp/epoxy composites and the main concepts about the flame retardants and the flame resistance techniques was presented. In this section, the need to investigate the possible use of hemp/epoxy composite materials, the study of their manufacturing processes (easily applicable for the industrial production) to produce low density composites and the study of techniques able to improve their flame resistance are highlighted. Therefore, an overview about biocomposites, their classification, their advantages and disadvantages, and their manufacturing technologies are reported in the second section. The materials and the methods used to conduct the experimental campaign, both for the manufacturing of lightweight structures and for the improvement of their flame resistance, are presented in the third section, which is structured as follows: -Firstly, a detailed description on the materials and in particular on the hemp fibres is reported; -Subsequently, in order to produce natural fibre reinforced composites with different density values the use of different processes, i.e. infusion, vacuum infusion, brushing hand lay-up and injection moulding were described. To achieve this goal, the section is divided in three sub-sections (Part 1, Part 2 and Part 3); each sub-section is focuses on one of the above-mentioned technologies; -Finally, the methods used to improve the flammability resistance of hemp composites, mixing the epoxy resin with different percentage content of APP (ammonium Poly-phosphate), are described. The subsequent sections of the thesis (Section 4 and 5) focus on the results and the discussion on both the feasibility of the illustrated processes and on the properties of the obtained products. Therefore, a full characterization in terms of tensile, flexural, compression, impact and flame resistance properties are carried out and then discussed. Conclusive remarks, where the main results are summarized, close the thesis work

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