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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
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.18(1) [February 2011]

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