1. Results and Discussion
Conclusion
2. Rubber-clay composite preparation
C.Komalan, K.E.George, P.A.S.Kumar, K.T.Varughese, S.Thomas
Dynamic mechanical analysis of binary and ternary polymer blends based on nylon copolymer / EPDM rubber and EPM grafted maleic anhydride compatibilizer. 2007
2. Professor Maria L. Auad. Polymer viscoelasticity: Dynamic Mechanical Analysis (DMA)
References
Introduction
Dynamic mechanical analysis(DMA) is particularly useful for evaluating the mechanical properties of visco-elastic materials like polymeric composites.
The dynamic mechanical properties of rubber clay composites depend on the filler content, spacing between silicate layer, cross link density, miscibility of polymer etc.
Reinforcement generally can be assessed based on the improvement in strength, modulus and other failure properties.
The chemical crosslink densities are found to follow the mechanical properties.
The enhancement in modulus by the addition of filler is associated with the stiffness of the material and this may be due to better interaction between rubber and filler.
On modification, the silicate layer of filler gets separated, correspondingly the particle size reduced and surface area found to be increased. There is an apparent increase in crosslink density due to large surface area of filler, with which the rubber and curatives may interact.
As number of cross linking increases, stiffness of material increases and correspondingly Tg and E’ increases.
The increment in SM is prominent in the glassy state below Tg while there is not much effect in the rubbery plateau region. Storage modulus in the rubbery region is an indication of entanglement.
Nano-filler reinforcement caused a decrease in tan delta and E”.
If the polymers blended are completely compatible, then the blend behaves like an ordinary amorphous polymer with a single transition region and an intermediate glass transition temperature.
Filler loading in non-compatible polymer blend shifts Tg to high temperature.
Objectives
Preparation of intercalated kaolin by organo-functionalization, followed by the preparation of polymer-clay composite by melt-blending method.
The cross link density of composites were evoked from Flory-Rehner equation.
The properties such as storage modulus, loss modulus and tan delta (mechanical loss factor ) of vulcanized natural rubber, in presence of kaolin and modified kaolin as reinforcing filler were investigated.
DMA also provides the glass transition temperature(Tg) of polymer, which is the temperature indicative of relaxation in a polymer, where a material changes from glassy to rubbery state.
DMA can also be effectively used to evaluate the extent of polymer miscibility.
Department of Science and Technology &
Council of scientific and industrial research (CSIR)
SCTIMST, Poojappura, Trivandrum
EICL, Veli, Trivandrum
Acknowledgment
Thank you
Applications
Coating purpose
Automobile industry
Garments
Biomedical
RC nano composite
Reinforcing Effect of Filler in Rubber Composites as Evidenced From DMA Studies
V.V.Raji, Surya Ramakrishnan, Roshin Peter, A.R.R.Menon, Rugmini Sukumar
Materials Science and Technology Division
CSIR-NIIST, Trivandrum
1. Kaolin intercalation
Experimental
Results and Discussion
Composition
CLD
Tg(oC)
Tan delta
E’(Pa)
E”(Pa)
NR 0
0.165
-59.23
2.02 E8 E7
NR B
0.167
-58.19 2 E8 E7
NR mB
0.192
-55.43
1.72 E8 E7
NiR B
0.211
-55.45
8.4
1.46 E8 E7
NiR mB
0.225
-55.38
8.6
1.41 E8 E7
BR B
0.162
-58.33
1.62
1.3557E8 E7
BR mB
0.188
-58.1
1.59 E8 E7
Code NR
(phr) SR
ZnO
St.a
Filler
MBT S
NR 0
100.81
5.1
2.02
2.01
2.06
NR B
(BCK)
100.83
5.04
2.04
8.02
2.09
NR mB
(mBCK)
100.82
5.05
8.01
2.08
2.03
NiR B
80.62
20.63
5.08
4.025
2.021
NiR mB
80.51
20.73
5.01
4.041
2.032
BR B
80.63
20.86
5.07
4.011
2.078
2.05
BR mB
80.76
20.67
5.03
4.01
2.07