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PRODUCT TRADE NAME : ABRON R 750
PRODUCT TYPE : POLYIMIDE RESIN (Bis-itaconimide type) Powder Resin
As a result of the efforts of Indian Space Research Organization to develop a processible polyimide, a prepolymer having excellent processability, stability at room temperature and with moderate cure temperatures was developed. Composites made from this prepolymer have yielded components for space and aerospace applications. ABRON-R 750 is being manufactured by A B R ORGANICS LIMITED with the license from Indian Space Research Organization.
ABRON-R 750 is highly amenable for polar & filament winding technology also. The prepregs made from ABRON-R 750 have a long shelf life of 3 to 6 months at room temperature.
GENERAL PROSEDURE FOR MAKING LAMINATES
Silica/Glass/Carbon cloth is impregnated with the resin solution. The solvent is allowed to evaporate (at 55 – 60°C when DMF is used as an solvent). The prepreg should have resin content of 35 – 40% weight.
The tack & drape of the prepreg is controlled by adjusting the residual solvent content.
The prepregs are stacked in mold and heated to 120°C and held for one hour under 60 psi pressure. The mold temperature is raised to 160 – 165 °C as a second step and maintained for another hour. Final cure is done by heating the mold to 200 – 220 °C for 2 hours under pressure. The laminate is released after cooling under pressure to 80 – 100 °C. Post curing is to be done at about 125 °C for 6 hours.
This procedure, however is not same for all shapes and thickness of laminates. The exact cycle has to be determined based on trials.
- Aerospace & space applications as resin matrix for composites ·
- Slot wedges for locomotive traction motors
SPECIFICATIONS OF ABRON – R 750
|Colour||Light Pinkish Brown|
|Specific Gravity at 25°C||1.1|
|Solubility||NMP / DMF|
|Bulk viscosity of 40% Solution||40 – 100 cP|
|Shelf life of Resin Powder||6 months at ambient temperatures (< 400 C )|
|Service Temperature||-200 to +300°C|
|Cure Temperature||200 °C – 230 °C|
|Dielectric Constant||80 – 90 KV/mm|
|Surface Resistivity at 25 °C||0.5 X 1014 Ohm.cm|
|Volume Resistivity at 25 °C||2.9 X 1014 Ohm.cm|
|Tan d at 25 °C||0.004|
|Volume Resistivity at 200 °C||4.7 X 1012 Ohm.cm|
|Tan d at 200 °C||0.025|
MECHANICAL PROPERTIES OF LAMINATES (ASTMD – 1184)
CARBON FIBRE ( UNIDIRECTIONAL)
|TENSILE STRENGTH||8 X 103 kg/cm2|
|FLEXURAL STRENGTH||5.5 x 103 kg/cm2|
|INTERLAMINAR SHEAR STRENGTH||305 kg/cm2|
GLASS FIBRE ( UNIDIRECTIONAL )
|TENSILE STRENGH||5.2 X 103 kg/cm3|
|FLEXURAL STRENGTH||5.0 X 103 kg/cm3|
|INTERLAMINAR SHEAR STRENGTH||135 kg/cm2|
ELECTRICAL PROPERTIES OF GLASS POLYMIDE COMPOSITE
- Dielectric Constant at 10 KHz frequency with 3.3 mm thick laminate = 2.1
- Descipation factor at 10 KHz frequency with 3.3 mm thick laminate = 0
- a) Electromagnetic radiation transparency with unidirectional glass/ PI laminate at 11.9 G.Hz ——- 89%
- b) Glass cloth – PI laminate ——- 52% c) Glass cloth-epoxy laminate ——- 5 6%
|Tensile strength||400 Mpa|
|Flexural strength||450 Mpa|
|Inter Laminar Shear strength||25 Mpa|
|Resin content||26 to 28% only|
|Density||1.8 – 1.9 gm/cc|
The above properties meet the requirements of composites functioning uptoo 220°C and at 400°C for short duration application.
MECHANICAL PROPERTIES OF LAMINATES BASED ON ABRON – R 750
|Composite systems||Tensile strength 103 |
| Flexural strength |
ABRON R 750/carbonUnidirectional
ABRON R 750/glassUnidirectional
ABRON R 750/glass Cloth
MECHANICAL PROPERTIES OF THERMALLY AGED PROPERTIES
|ABRON R 750||ABRON R 750|
Value obtained after soaking the sample for 100 hrs at 200°C.