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Thanunya Saowapark, Pongdhorn Sae-oui, Narongrit Sombatsompop, Chakrit Sirisinha
Storage Instability of Fly Ash Filled Natural Rubber Compounds
Appl. Rheol. 22:5 (2012) 55414 (9 pages)
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Generally, fly ashes (FA) could function as either semi-reinforcing or non-reinforcing fillers in polymeric systems, depending
on particle size, specific surface areas and surface chemistry of FA particles. Typically, FA particles are spherical with smooth
surfaces having significant influences on viscoelastic and mechanical properties. Additionally, the presence of heavy metals
in FA particles could play role on degradation process of rubber molecules to some extent. In this article, the storage instability
and thermal aging properties of FA filled natural rubber (NR) compounds were focused via changes in viscoelastic responses.
Results obtained reveal that the storage duration of FA filled NR compounds leads to decreases in elastic modulus and
molecular weight, particularly in the compounds with high FA loading. By replacing NR with polyisoprene (IR) containing no
non-rubber substances, the storage stability is significantly enhanced. It is believed that the presence of metal ions in both
FA and non-rubber substances in NR could catalyze the degradation process of rubber molecules. Such degradation process
could effectively be suppressed by the addition of amine-based antioxidant.
► Cite this publication as follows:
Saowapark T, Sae-oui P, Sombatsompop N, Sirisinha C: Storage Instability of Fly Ash Filled Natural Rubber Compounds, Appl. Rheol. 22 (2012) 55414.
Nilobon Phewthongin, Pongdhorn Saeoui, Chakrit Sirisinha
Comparison of Viscoelastic Behaviour in Silica Filled Cured and Uncured cpe/nr Blends with Various Mixing Time
Appl. Rheol. 16:4 (2006) 182-189
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Blends of 30-phr silica filled elastomeric chlorinated polyethylene (CPE) and natural rubber (NR) at the blend
composition ratio of 80/20 CPE/NR were prepared with various mixing time from 120 to 600 s. Viscoelastic
behaviours of cured and uncured blends were determined using two rheometers with different shear modes,
i.e., the oscillatory rheometer (Rubber Process Analyser, RPA2000) and the rate-controlled capillary rheometer
(Goettfert Rheotester 2000). Results obtained reveal that the viscoelastic behaviour of blends is influenced by
the formation of silica transient network, particularly in cured blends. Mixing time affects viscoelastic properties
of vulcanised blends to some extent which is due probably to the high extent of thermal degradation, but
plays no significant role in viscoelastic properties of unvulcanised blends. The superimposition of oscillatory and
steady shear results is possible when the elastic component is eliminated from the results.
► Cite this publication as follows:
Phewthongin N, Saeoui P, Sirisinha C: Comparison of Viscoelastic Behaviour in Silica Filled Cured and Uncured cpe/nr Blends with Various Mixing Time, Appl. Rheol. 16 (2006) 182.
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