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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.18 [2011] >
IJEMS Vol.18(1) [February 2011] >
| Title: | Studies on PP/SBS blends with and without nanoclay |
| Authors: | Shashidhara, G M
Devi, S H Kameshwari |
| Keywords: | Polypropylene
SBS
Nanoclay
Crystallization |
| Issue Date: | Feb-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Blends
of PP and SBS with and without nanoclay are prepared using twin screw extruder.
The nanoclay content and SBS are varied from 1-3% and 5-15%, respectively.
Effects of SBS and nanoclay content on tensile, notched impact strength, heat
deflection temperature, hardness and melt flow index are studied. The DSC study
shows decrease in the degree of crystallinity of PP/SBS blends with increase in
SBS content up to 10% loading but shows an increasing trend at 15% loading. An
attempt has been made to correlate tensile properties and various
crystallization parameters such as peak crystallization temperature (Tp), onset temperature of
crystallization (Tonset),
initial slope of exotherm (Si),
the quantity
(Tc-TP), area under the exotherm (A/m) and width at half
height (ΔW). We found that the stress
at break, tensile modulus and yield stress have good correlation with ΔW. The yield stress and stress at break
are also influenced by Xc while
strain at break is better correlated to Tp
which is a function of cooling rate. Yield strain seems to have strong
dependency on ΔW and Xc. The role of SBS as
nucleating agent for PP crystallization has been established. Incorporation of
3 phb clay to a 90/10 PP/SBS blend results in an increase in G’ at 30oC. This indicates
that the SBS rubber is likely to have interacted molecularly with clay
particles. |
| Page(s): | 69-78 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.18(1) [February 2011]
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