Review article

Fibre Reinforced Polymers Part II: Effect on Mechanical Properties

Ante Lončar ; Health Care Clinic West - Zagreb, Zagreb, Croatia
Denis Vojvodić ; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Vjekoslav Jerolimov ; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Dragutin Komar ; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Domagoj Žabarović ; School of Dental Medicine, University of Zagreb, Zagreb, Croatia

Abstract

The paper describes different effects on the mechanical properties of fibre reinforced polymers, such as direction and the amount of fibres, impregnation of fibres with the polymer matrix, and adhesion between fibres and the polymer matrix. Direction of the fibres can be unidirectional (vertical to the direction of loading), i.e. bidirectional or multidirectional (under different angles to the direction of loading), or even in random order. The amount of fibres also increases the strength of the composite, although reinforcement with fibres can only be efficient when loading is transferred from the matrix to the fibres. This requires good impregnation of the fibres with the polymer matrix, which depends on the type and viscosity of the polymer matrix (prior to polymerisation), and possibility of good wetting of each fibre. For improvement of adhesion between the polymer matrix and glass fibres bonding/coupling agents are used, particularly silane. They bond to the surface of the glass by silane bridges and by co-polymerisation initiated by free radicals bond with the polymer matrix, thus improving adhesion between fibres and the polymer matrix. Apart from the mechanical properties, such good bonding is also important for reducing the unfavourable effect of water on the marginal surface of the fibre-base.

Keywords

Polymers; Composite Resins; Silanes

Hrčak ID:

21252

URI

https://hrcak.srce.hr/21252

Publication date:

15.3.2008.

Article data in other languages: croatian

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