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Pultruded natural fibres for cleaner air - 2

 

Results
From DMA and DSC tests, it is shown that optimised results for bioepoxy systems are obtained with a curing cycle at 160ºC. This curing cycle has been evaluated and optimised in the pultrusion process in order to adapt to the requirements of natural fibre processing.

Sample

Tg onset E’ (ºC)

Tg peak E’’ (ºC)

Tg tan delta (ºC)

Curing cycle at 150ºC

60.49

60.82

77.35

Curing cycle at 160ºC

75.43

77.81

91.78

Curing cycle at 170ºC

75.82

77.93

91.74

 

 

 

 

 

Different compositions of reinforced bar were evaluated by tensile tests.

Pultrusion profile composition

Young´s Modulus (MPa)

Tensile Strength

(MPa)

Elongation at break (%)

Bioepoxy system + glass fiber

48400

s=2990

786

s=70

1,7

s=0,1

UP resin + glass fiber + natural fiber

46100

s=575

513

s=21

1,1

s=0,1

UP resin+ glass fiber

46400

s=1130

537

s=59

1,2

s=0,1

UP resin + glass fiber + Alumina Trihydrate

33700

s=3840

346

s=49

1,1

s=0,3

An optimised pultrusion process at pilot plant has been obtained to produce biocompositesprofiles with bioepoxy resin. Better mechanical results in pultrusion profiles at pilot plant level are obtained by bioepoxy system and glass roving. Nevertheless, flax fibres with low twist can be used to produce pultrusion profiles and no significant differences in mechanical properties were found between profiles prepared with glass fibres and hybrid fibres (glass and flax) with unsaturated polyester (UP) resin.

The OSIRYS project is led by Tecnalia (Project Coordinators), in partnership with Acciona, AIMPLAS, ENAR and VISESA of Spain, NetComposites from the UK, Fraunhofer, SICC and Tecnaro of Germany, IVL of Sweden, Conenor and VTT of Finland, Omikron of Hungary, UNStudio from the Netherlands, Bergamo Tecnologie from Poland, Collanti Concorde from Italy, and Amorim Cork Composites from Portugal.

The project has received funding from the European Union’s Seventh Framework Programme.