Novel Bio-Degradable Lignin Reinforced NBR Composites

Kavita Agarwal; Mahender Prasad; Rishi Sharma; Dipak Kumar Setua
Lignin is evolved from wood having feature of good biodegradation properties. The samples were exposed to standard culture media for fixed intervals of time and evaluated for changes in their physical properties, thermal stability and morphology. Rubber vulcanizates were analyzed for physico-mechanical properties and thermal stability, and compared with fillers like phenolics resin and carbon black and lignin. Fillers are used to reinforce polymers to improve properties of matrices for biological activity. Lignin reinforced rubber biocomposite has been found to produce superior elongation properties compared to phenolic resin but inferior to carbon black. The development of commercially viable “green products” based on natural resources for both matrices and reinforcements for a wide range of applications is on the rise. This effort includes new pathways to produce natural polymers with better mechanical properties and thermal stability using nanotechnology and use of natural polymers to make biodegradable plastics and their composites with lignin. The present study was initiated to isolate and characterize a number of NBR-degrading bacteria from various ecosystems in India. It also suggests that rubber-degrading bacteria might be useful for the disposal of discarded rubber products (waste management). This paper presents the effect of different bacteria through in vitro antimicrobial activity in NBR, NBR with phenolic resin, NBR with carbon black and Lignin reinforced Rubber composites. These NBR composites were tested against five pathogenic bacteria Bacillus subtilis, Escherichia coli, Streptococcus mutans, Staphylococcus aureus and Pseudomonas aeruginosa isolated from clinical samples mainly for SEM studies.
Bio-Degradable; Lignin; NBR; SEM
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