Curing Characteristics and Physical Properties of Natural Rubber Composites Using Modified Clay Filler
The differences in the curing characteristics and physical properties of natural rubber samples using clay and modified clay as fillers were studied. After the clay was modified with dodecylamine, the rubber milling process was conducted at a temperature of 65–70oC to obtain the natural rubber...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universitas Indonesia
2020-10-01
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| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | https://ijtech.eng.ui.ac.id/article/view/4083 |
| Summary: | The
differences in the curing characteristics and physical properties of natural
rubber samples using clay and modified clay as fillers were studied. After the
clay was modified with dodecylamine, the rubber milling process was conducted
at a temperature of 65–70oC to
obtain the natural rubber compound. The content of clay and modified clay in
the natural rubber was approximately 15 phr. A curing test at 150oC was performed, and then the physical properties were
tested. The results of the physical properties test showed a significant
increase in the tensile strength, from 16.3 to 25 MPa, a change in hardness
from 43 to 54 Shore A, a change in modulus of 300% from 1.6 to 4.6 MPa, a
change in tear strength from 29.3 to 40.2 kN/m, and a change in compression set
from 25.75% to 30.57% due to the use of modified clay compared to the sample
with unmodified clay. However, some physical properties—such as elongation at
break, from 720% to 600%—decreased dramatically. Smax increased sharply, from 7.05 to 11.45
kg-cm, while optimum cure and scorch time decreased sharply, from 11.23 to 6.43
minutes and from 6.35 to 2.38 minutes, respectively. FTIR and XRD analyses showed evidence of clay
modification. Similarly, the AFM and SEM analyses of clay surfaces and the
dispersion of the clay in the rubber showed that the dispersion of the modified
clay in the rubber was better than that of unmodified clay. The TA/DTA analysis
also supported the above explanation, particularly for the changes in curing
characteristics and physical properties. |
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| ISSN: | 2086-9614 2087-2100 |