STATISTICAL REVIEW OF CALCIUM NITRATE COAGULANT ON THE NATURAL RUBBER LATEX FILM STRENGTH

Ihda Novia Indrajati, Indiah Ratna Dewi

Abstract


Statistical analysis had been used to study the effect of calcium nitrate Ca(NO3)2 (CaN) as coagulant onto the properties of natural rubber latex involving film thickness (h), swelling ratio (Q), tensile strength (TS), elongation at break (EB) and modulus 300% (M300). CaN concentration (in ethanol 95%) varied from , 5, 10, 15, 20, 25 and 30% (w/v). Calcium carbonate (30% w) were added into each variation as detacking agent. Single-coagulant dipping was applied to produce NRL film and vulcanization was held by steam 90 °C for 30 min. Swelling test had been conducted by immersion in toluene within 24 h at 25±2 °C in a closed bottle. Statistical analysis used in this work consisted of Pearson correlation and linear regression. The results showed CaN concentration gave very low correlation with TS and M300 with non-significant correlation coefficient. EB gave low correlation but with significant coefficient. High correlation was given by EB, Q and h. Linear regresion could be used to predict the behavior of EB, Q and h because their slope were not zero. Experimental data followed normal distribution because the Skewness/Kurtosis (S/K) ratio lied within value of -2< S/K<2.

 

Keywords: coagulant dipping, calcium nitrate, latex film, statistical analysis

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