Abstract
An attempt was made to replace conventional ZnO with nanoZnO in low ammonia, tetramethylthiuramdisulphide (TMTD)/Zinc oxide (ZnO) natural rubber latex preservative system (LATZ). Different percentages of TMTD and nanoZnO dispersions containing equal portions were prepared and used to preserve the latex. Centrifuged natural rubber latex (CNRL) thus prepared were tested for VFA (volatile fatty acid) number and MST (mechanical stability time) periodically over a period of 75 days. Mechanical properties of vulcanized latex thin films made out of CNRL preserved were measured. Development of VFA number in CNRL samples preserved with nanoZnO was lower than the sample prepared with the conventional ZnO (control). Both the VFA number results and surface plots of the matured CNRL samples showed that preservative action of the modified preservative system was mainly governed by the amount of nanoZnO in the system. MST values of CNRL preserved with nanoZnO substituted systems were significantly high when compared to the control. Tensile and tear properties of the vulcanized films prepared using CNRL preserved with nanoZnO were almost comparable with those of the vulcanized films prepared using control system. The statistical analysis indicated that CNRL preserved with modified preservative system of 10% and 15% of TMTD/nanoZnO could be stored up to 55 and 75 days respectively, without exceeding VFA value above 0.02.
Highlights
Natural rubber latex (NRL), being a natural polymer obtained from Hevea brasiliensis possesses certain important unique characteristic properties owing to its high molecular weight polymer chains, and chemical structure of the polymer backbone
This study investigated the effect of nanoZnO as a component of a preservative system for Centrifuged natural rubber latex (CNRL) along with TMTD and low ammonia
VFA studies confirmed that nanoZnO has a significant contribution as a preservative for CNRL, when compared to conventional Zinc oxide (ZnO)
Summary
Natural rubber latex (NRL), being a natural polymer obtained from Hevea brasiliensis possesses certain important unique characteristic properties owing to its high molecular weight polymer chains, and chemical structure of the polymer backbone. Many researchers have studied the performance of inorganic nanomaterials, especially the nanoparticles of metal oxides, which are found to be effective and possess excellent antibacterial properties in comparison to their conventional micro and macro counterparts (Espitia et al, 2012; Dizaj et al, 2014) Among these metal oxides, nanoZnO has been widely studied in different preservative systems in a variety of applications owing to its enhanced antibacterial properties, low cost, excellent stability and less complex manufacturing processes (Wang et al, 2003; Padmavathy and Vijayaraghavan, 2008; Dizaj et al, 2014; KołodziejczakRadzimska and Jesionowski, 2014). Film properties of the CNRL preserved with nanoZnO and the CNRL preserved with conventional LATZ preservative system were compared
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