JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 47

Applications after impregnation because of the high reactivity of the thermoset. Furthermore, the manufacturing process relies on safety equipment, because harmful volatiles can be released due to the chemistry of commonly used thermosets. The goal of our project was to develop a new automotive composite that contains renewable materials in proportions as high as possible for lightweight structures with high mechanical properties, thermal stability and easy-to-use fabrication (high storage stability and no release of harmful volatiles). Kenaf/flax non-wovens In the current contribution, nonwovens based on a mixture of kenaf and flax at the ratio of 50:50 are discussed. Mixtures of finer flax fibres with coarser fibres Fig. 2: Mixtures like kenaf lead to an optimum balance in material properties of the nonwovens (Figure 2). The finer flax fibres lead to improved stability. At the same time, complete saturation with binder is achieved since kenaf has no wax film on the fibre surface to act as a barrier against impregnation. The matrix system used was a reactive aqueous acrylic resin, which is free of phenol and formaldehyde. In contrast to composites made of the usual formaldehyde resin-based thermoset binders, the fabricator does not need to apply the resin immediately before moulding the parts, since curing takes place at temperatures above 100°C. At lower temperatures, the binder is thermoplastic, which allows the production of impregnated mats as semi-finished products with excellent storage stability. Impregnation of the non-wovens was carried out using two different resin contents, 15% and 25% (Figure 3). Fig. 4: moulded parts Moulded parts of different densities were pressed (Figure 4) and their technological performance was tested: flexural strength (FS), flexural modulus of elasticity (MOE), water uptake (WU), impact strength, thickness swell and weatherability in a climate chamber, and sound absorbance. The results for FS, MOE and WU are discussed below in detail. As a result of the laying and needling processing steps, the properties of the resulting non-wovens and the final moulded parts are highly anisotropic. Thus, flexural strength and flexural modulus of elasticity were tested in parallel and perpendicular to the processing direction. Samples in production direction generally displayed higher mechanical strength. Both flexural properties depend primarily on the density of the moulded composite (Figure 5 and Figure 6). Fig. 5: flexural properties Fig. 3: protection of impregnated materials Fig. 6: flexural properties No37 December 2007 / JEC Composites Magazine

JEC COMPOSITES MAGAZINE - Issue #37 - December 2007

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #37 - December 2007

Cover
Edito
CONTENTS
NEWS WORLDWIDE
- Companies
- Agenda of events
- Innovations
BUSINESS
- Trends
- Market survey: China
- Initiative
- Niche markets
- Human capital
FEATURE - BIOCOMPOSITES
- Properties
- Materials
- Applications
USERS’ PLATFORM
- Composites in the world
- Applications
- Successful partners
- Impact analysis
KNOW-HOW
- Thermoplastic fabric
- Control
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - Cover
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 2
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - Edito
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 4
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 5
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - CONTENTS
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 7
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Companies
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 9
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 10
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 11
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Agenda of events
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 13
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Innovations
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 15
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 16
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 17
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Trends
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 19
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Market survey: China
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 21
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 22
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 23
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 24
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 25
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 26
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 27
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Initiative
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 29
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Niche markets
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 31
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Human capital
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 33
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Properties
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 35
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 36
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Materials
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 38
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 39
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 40
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 41
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Applications
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 43
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 44
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 45
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 46
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 47
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 48
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 49
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Composites in the world
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 51
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Applications
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 53
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Successful partners
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 55
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - KNOW-HOW
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 57
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 58
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Thermoplastic fabric
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 60
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 61
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - - Control
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 63
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 64
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 65
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 66
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 67
JEC COMPOSITES MAGAZINE - Issue #37 - December 2007 - 68
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