Attached
This study presents an experimental and practical analysis of the effect of gamma irradiation
on blend of recycled nitrile butadiene rubber and polyamide samples for the manufacture of rubfevf:
paver as an alternative for cement paving blocks. Gamma irradiation radical-radical interaction- if
crosslinking of elastomers and thermoplastic is a special crosslinking method as process is fa s tf^
pollution free and simple. If
NBR and PA polymer blends with various blend ratios were prepared through a low tem peratin|||t
mixing process. In this study a blend of polymer, based on waste nitrile butadiene rubber andwastejff
polyamide (Nylon 6,6) has beeh investigated for several physical properties at varying NBR/
content. NBR/PA (100:5) blend was selected for gamma irradiation. It achieved a tensile valu ^
3.040 N/mm2, tear value of 23.805 N/mm2 and hardness value 40 (Shore A). These values: itfif
higher range when compared with other ratios of (100:1.25), (100:2.5) and (100:10) NBR/ PAb)<
The structural properties of the polymer blends before and after they had been exposed to
irradiation were investigated.
Rheological properties are measured to study curing behavior of blends. Mechanical propeitie
tensile strength, elongation at break, hardness and modulus at different elongations were s
compared with those of un-irradiated sample. A relatively low-radiation dose (54.4 kGy) was
be, effective in improving the level of mechanical properties. According to FT-IR spi
analysis of irradiated sample, there are no novel peaks corresponding to novel functional
NBR/ PA blend. Enhancement in mechanical properties has been observed for low radiation
showing that gamma irradiation affects the NBR/ PA blend in a more efficient way at lowef
rates.
Considering the current waste disposal difficulties and disposal cost (Rs.15,000 per to n );to f& i§
industry, a paving block sample was prepared as a green solution for waste NBR and Nylop^6>§|;4^
Water leachate of paving block was analyzed for heavy metals, BOD, COD, oil and grease levelsr f;;
Those values are lower than the tolerance limits for discharge industrial waste into inland surface^
waters, on land for irrigation and into marine coastal areas. Mechanical properties of paving block^ f
such as compression set, hardness, swelling in water, UV exposure test, abrasion resistance, cut; ?
resistance, tear resistance and puncture resistance indicate suitability for application in hospital OPD
floor area, nurseries, children play area, gymnasium and public walk ways. This study successfully >
offers solution for environmentally friendly disposal of nitrile rubber waste and nylon waste with .
reasonable profit to the industry.
