2.2 Preparation of Bentonite- Filled EPDM Composites
Prior to compounding of EPDM rubber with Bt clay, Bt was first dried in vacuum oven at 800
C for 24h. The
compounding process of EPDM/Bt composite was done by using the same ingredients used by Ismail et al., (2011)
as
in Table 1 where bentonite clay followed by sulphur were incorporated last
6
. A laboratory scale (160mm x 320mm)
two roll mill, model XK-160 was used during compounding process. Mosanto Moving Die Rheometer (MDR 2000)
was then used to determine the cure characteristics of the rubber compound at 1500
C, in accordance to ISO 3417.
The curing time (t90) obtained from the rheograph was then used to compress rubber compound into sheets. The
temperature for the compression moulding used was 1500
C.
2.3 Tear Properties
In order to obtain the tear sample for tear test, the rubber compound was compressed using a square mould
of 2mm in thickness. The samples were then left at room temperature for at least 6 hours before they were cut
into trouser shape. The tear sample was tested using Instron 3366 at room temperature with the crosshead speed
of 50mm/min in accordance to ASTM D624.
2.4 Morphological Studies
The tear fractured surface of the EPDM/Bt samples from the tear test was observed under Supra-35VP field
emission scanning electron microscope (SEM) to determine their surface morphology, shape, dispersion and
adhesion. Test specimens were mounted on the aluminium using double-sided sticky tape and then coated with
a thin layer of Pd-Au before testing.
2.2 Preparation of Bentonite- Filled EPDM Composites Prior to compounding of EPDM rubber with Bt clay, Bt was first dried in vacuum oven at 800C for 24h. The compounding process of EPDM/Bt composite was done by using the same ingredients used by Ismail et al., (2011) as in Table 1 where bentonite clay followed by sulphur were incorporated last 6. A laboratory scale (160mm x 320mm) two roll mill, model XK-160 was used during compounding process. Mosanto Moving Die Rheometer (MDR 2000) was then used to determine the cure characteristics of the rubber compound at 1500C, in accordance to ISO 3417. The curing time (t90) obtained from the rheograph was then used to compress rubber compound into sheets. The temperature for the compression moulding used was 1500C. 2.3 Tear Properties In order to obtain the tear sample for tear test, the rubber compound was compressed using a square mould of 2mm in thickness. The samples were then left at room temperature for at least 6 hours before they were cut into trouser shape. The tear sample was tested using Instron 3366 at room temperature with the crosshead speed of 50mm/min in accordance to ASTM D624. 2.4 Morphological Studies The tear fractured surface of the EPDM/Bt samples from the tear test was observed under Supra-35VP field emission scanning electron microscope (SEM) to determine their surface morphology, shape, dispersion and adhesion. Test specimens were mounted on the aluminium using double-sided sticky tape and then coated with มีชั้นบาง ๆ ของ Pd-อูก่อนการทดสอบ
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