Effect of coir fiber reinforcement on mechanical properties of vulcanized natural rubber composites

2018 ◽  
Vol 25 (3) ◽  
pp. 517-528 ◽  
Author(s):  
Yogesh Patil ◽  
Sumit Sharma
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Fiber Reinforcement ◽  
Maximum Load ◽  
Coir Fiber ◽  
Rubber Composites ◽  
Aging Test ◽  
Natural Rubber Composites ◽  
Aging Resistance ◽  
Different Temperatures

Abstract In this study, the effect of coir fiber reinforcement on the mechanical properties of vulcanized natural rubber composite has been studied. An attempt has been made to predict the effect on tensile strength, maximum load, and elongation at break (%) of coir fiber-reinforced vulcanized natural rubber composites under cold, heat, and water aging tests. The natural rubber was vulcanized at 150°C. The fibers were soaked in a 5% solution of NaOH for 48 h at room temperature. At different temperatures, cold, heat, and water aging resistance tests were conducted to understand the behavior of the composite under different environment. The properties recorded after aging tests were compared with initial properties to investigate the effect of fiber reinforcement. The results revealed that the samples containing coir fiber showed better performance after each aging test. The specimens showed the highest properties in case of water aging resistance.

Effect of vulcanization time on crosslink density and aging performance of natural rubber composites

2020 ◽  
Vol 62 (8) ◽  
pp. 858-862
Author(s):  
Ece Unur Yilmaz ◽  
Ahu Kor Dayioglu ◽  
Seda Balaban
Keyword(s):  
Natural Rubber ◽  
Crosslink Density ◽  
Elevated Temperatures ◽  
Mechanical Performance ◽  
Operating Conditions ◽  
Rubber Composites ◽  
Rubber Mixture ◽  
Natural Rubber Composites ◽  
Different Temperatures ◽  
Auto Parts

Abstract Natural rubber composites are widely used in the automotive industry because of their improved viscoelastic characteristics that are mostly governed by crosslink density. However, rubber parts suffer deterioration of performance over long service lives. Therefore, optimization of crosslink density and prediction of changes in physico-mechanical properties over time at elevated temperatures is extremely important for the production of safe auto parts. In this work, the effect of vulcanization time on crosslink density and thus the performance and lifetime of natural rubberbased auto parts was investigated. The natural rubber mixture prepared in this context was vulcanized for 3, 5, 10 and 15 minutes at a constant temperature of 160 °C. The crosslink density of each vulcanizite was determined by equilibrium swelling tests and the Flory-Rehner equation. The maximum crosslink density (10.75 × 10-5 mol × cm-3) and the minimum permanent compression set values (10 % at 70 °C and 25 % at 100 °C) were recorded for the sample vulcanized for 10 minutes (v10). Aging behavior of the samples were investigated by stress relaxation tests performed at 85 °C, 100 °C and 120 °C. The service lives of the vulcanizites at different temperatures were predicted by linear Arrhenius fits of degradation times. The sample vulcanized for 10 minutes (v10) was shown to exhibit a service life of 2282 hours at 70 °C in air and the optimum physico-mechanical performance under real operating conditions. The performance and lifetime prediction procedure used in this work could be employed in an early design of rubber components for specific applications.

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