This paper presents a method for obtaining the gel conductive systems being made of natural rubber (Hevea brasiliensis) (NR) and styrene-butadiene rubber (SBR). For this purpose, a natural rubber (Hevea brasiliensis), coming from a rubber tree plantation in Ranni, Kerala State, Southwest India, was used. Rubber latex was obtained by making incision in the trunk of Pará rubber tree and then collected, afterward being imported to Poland in 2006. Due to good quality and low price, styrene-butadiene rubber was used in the study as a mixture of 1,4-cis and –trans forms, composed of 77% butadiene and 23% styrene, No. KER® 1507, which was produced at the Dwory Chemical Plant S.A. near Oswiecim, Poland. This rubber was obtained in the process of low-temperature emulsion co-polymerisation. As an agent inducing conduction in the rubber systems, divalent metal chlorides, such as BaCl2, CaCl2, CdCl2, CoCl2, CuCl2, FeCl2, MgCl2, MnCl2, MoCl2, NiCl2, SnCl2, SrCl2, or ZnCl2 (manufactured by Chempur®, Poland), and sodium perchlorate, being obtained in the result of sodium hydroxide and perchloric acid synthesis, were used. Active carbon (NORIT® SX, manufactured by Chempur, Poland), with a 900m2×g-1 active surface, was also used. For all systems with the divalent metal chlorides mentioned above, specific conductance was determined in the temperature range of 273 K to 313 K. The optimum quantities of doping agents in the form of divalent metal chlorides and active carbon being added to natural rubber (Hevea brasiliensis) and styrene-butadiene rubber were determined. It was found that specific conductance for the rubber systems with the addition of divalent metal chlorides and active carbon amounted to 10-4-10-7 S×cm-1. On the other hand, specific conductance for sodium perchlorate and active carbon-doped rubbers amounted to 10-3-10-5 S×cm-1. The capacitance values for the polymer compositions being doped with divalent metal chlorides are as follows: 8 F/g for the SBR system, and 28 F/g for the NR system.
Support the magazine and subscribe to the content
This is premium stuff. Subscribe to read the entire article.