Nondestructive testing of defects in adhesive joints

3 Results
4. Swelling index – Toluene 24 hr (27 0 C)
5. Surface morphology- Scanning Electron Microscope (SEM)
1. Particle Size by X-ray diffraction (XRD) technique
Figure 1. XRD of synthesized nano CaCO3
• Particle size determined by using Scherer’s formula-
• d = k λ / ∆2θ Cos θ
2. Mechanical Properties
I) Tensile strength
It is observed that the tensile strength of Brabender processed SBR nanocomposites
showed better tensile strength than the two roll mill processed SBR nanocomposites.The
improvement in tensile strength of samples processed on Brabender is due to the proper mixing of
nano filler CaCO3 in polymer matrix which results the uniform dispersion of nano filler in SBR
polymer matrix.
Tensile strength Pa
30
25
20
15
10
5
0
0 1 2 3 4 5
Filler content (w t%)
Tw o roll mill
Brabender
Figure 2. Tensile strength of SBR filled with nano CaCO3 processed on two roll mill (TRM)
and Brabender Plastograph