Mechanical, thermal and fire retardation behaviours of nanoclay/vinylester nanocomposites
Mechanical, thermal and fire retardation behaviours of nanoclay/vinylester nanocomposites
K. R. VISHNU MAHESH1, H. N. NARASIMHA MURTHY2(), B. E. KUMARA SWAMY1, S. C. SHARMA3, R. SRIDHAR2, Niranjan PATTAR2, M. KRISHNA2, B. S. SHERIGARA1
1. Department of P. G. Studies and Research in Industrial Chemistry, Kuvempu University, Shankaraghatta, Shimoga 577451, Karnataka, India; 2. Department of Mechanical Engineering, R. V. College of Engineering, Bangalore 560059, Karnataka, India; 3. Tumkur University, Tumkur 572103, Karnataka, India
The dispersion of montmorillonite (MMT) in vinylester for preparing nanoclay/vinylester gel coat was reported. Two sets of MMT/vinylester specimens, namely Type 1 and Type 2, were prepared for comparative studies. Type 1 specimens were prepared using ultrasonication only, and Type 2 specimens were prepared using both ultrasonication and twin-screw extrusion. According to XRD and TEM results, Type 2 specimens showed lower levels of nanoclay agglomeration and higher levels of exfoliation. DSC results showed that the glass transition temperatures of Type 2 specimens are higher than those of Type 1 specimens. TGA results showed that the residual weight of 4 wt.% MMT/vinylester of Type 1 was 7.38%, while the corresponding value of Type 2 was 13.5%, indicating lower thermal degradation in the latter. MMT/vinylester/glass and MMT/vinylester/carbon specimens were fabricated and tested for mechanical and fire retardation behaviours. Type 2 based nanocomposite laminates showed greater values of ultimate tensile strength, flexural strength, interlaminar shear strength, impact strength, horizontal burning rate, and vertical burning rate than Type 1 based laminates. SEM images of tensile fractured surfaces revealed that Type 2 based laminates have no or less agglomeration of nanoclay than Type 1 based laminates.
Corresponding Author(s):
NARASIMHA MURTHY H. N.,Email:hnmdatta@yahoo.com
引用本文:
. Mechanical, thermal and fire retardation behaviours of nanoclay/vinylester nanocomposites[J]. Frontiers of Materials Science, 2011, 5(4): 401-411.
K. R. VISHNU MAHESH, H. N. NARASIMHA MURTHY, B. E. KUMARA SWAMY, S. C. SHARMA, R. SRIDHAR, Niranjan PATTAR, M. KRISHNA, B. S. SHERIGARA. Mechanical, thermal and fire retardation behaviours of nanoclay/vinylester nanocomposites. Front Mater Sci, 2011, 5(4): 401-411.
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