A series of low-density polyethylene (LDPE)/ethylene propylene diene terpolymer (EPDM) blends with various compositions have been prepared by melt mixing followed by injection molding. These specimens are irradiated a...A series of low-density polyethylene (LDPE)/ethylene propylene diene terpolymer (EPDM) blends with various compositions have been prepared by melt mixing followed by injection molding. These specimens are irradiated at 40, 80, 120 and 160 kGy electron beam radiation. The gel content increases with increase in EPDM and as well as EB dose. Storage modulus (E’) and loss modulus (E”) are decreased with increase in EPDM content. Storage modulus continues to increase and loss modulus keeps on decreasing with radiation dose. Interestingly, damping property is found to be more for EPDM rich blends, which again decreases upon irradiation. Morphology of fractured surface of LDPE/EPDM shows that with increase in EPDM content, the size and depth of the cavity becomes larger and deeper indicating higher ductility. But, EB crosslinking makes the surface smoother and the smoothness keeps on increasing with increase in dose rendering stiffness to the samples.展开更多
Non-steroidal anti-inflammatory drugs(NSAIDs)(aspirin,ibuprofen,naproxen,ketoprofen,and diclofenac)were determined in three selected wastewater treatment plants(WWTPs)in southwestern India and the Gurupura River.The c...Non-steroidal anti-inflammatory drugs(NSAIDs)(aspirin,ibuprofen,naproxen,ketoprofen,and diclofenac)were determined in three selected wastewater treatment plants(WWTPs)in southwestern India and the Gurupura River.The concentrations of the NSAIDs in the influents of the WWTPs ranged 125-184 mg/L for aspirin,5e22 mg/L for ibuprofen,11-217 mg/L for naproxen,3-41 mg/L for ketoprofen and 12-68 mg/L for diclofenac.In the effluents,concentrations ranged 0.4-0.7 mg/L for aspirin,0.1-2 mg/L for ibuprofen,3-14 mg/L for naproxen,0.6-0.8 mg/L for ketoprofen and 2-26 mg/L for diclofenac.The NSAIDs in the WWTPs were found in the order of aspirin>naproxen>diclofenac>ketoprofen>ibuprofen.In the Gurupura river,aspirin(0.02 mg/L),ibuprofen(0.17 mg/L),naproxen(8.8 mg/L),ketoprofen(1.5 mg/L)and diclofenac(1.6 mg/L)were quantified.Hazard quotient(HQ)for various aquatic organisms were calculated for the effluents of WWTPs and Gurupura river water.The results showed medium risk of ibuprofen and naproxen to polyp Hydra attenuata.Continuous discharge of NSAIDs into the river can result in adverse effects to the resident organisms.展开更多
文摘A series of low-density polyethylene (LDPE)/ethylene propylene diene terpolymer (EPDM) blends with various compositions have been prepared by melt mixing followed by injection molding. These specimens are irradiated at 40, 80, 120 and 160 kGy electron beam radiation. The gel content increases with increase in EPDM and as well as EB dose. Storage modulus (E’) and loss modulus (E”) are decreased with increase in EPDM content. Storage modulus continues to increase and loss modulus keeps on decreasing with radiation dose. Interestingly, damping property is found to be more for EPDM rich blends, which again decreases upon irradiation. Morphology of fractured surface of LDPE/EPDM shows that with increase in EPDM content, the size and depth of the cavity becomes larger and deeper indicating higher ductility. But, EB crosslinking makes the surface smoother and the smoothness keeps on increasing with increase in dose rendering stiffness to the samples.
基金supported by the Board of Research in Nuclear Sciences(BRNS),Government of India,through project no.35/14/17/2017-BRNS/35140.
文摘Non-steroidal anti-inflammatory drugs(NSAIDs)(aspirin,ibuprofen,naproxen,ketoprofen,and diclofenac)were determined in three selected wastewater treatment plants(WWTPs)in southwestern India and the Gurupura River.The concentrations of the NSAIDs in the influents of the WWTPs ranged 125-184 mg/L for aspirin,5e22 mg/L for ibuprofen,11-217 mg/L for naproxen,3-41 mg/L for ketoprofen and 12-68 mg/L for diclofenac.In the effluents,concentrations ranged 0.4-0.7 mg/L for aspirin,0.1-2 mg/L for ibuprofen,3-14 mg/L for naproxen,0.6-0.8 mg/L for ketoprofen and 2-26 mg/L for diclofenac.The NSAIDs in the WWTPs were found in the order of aspirin>naproxen>diclofenac>ketoprofen>ibuprofen.In the Gurupura river,aspirin(0.02 mg/L),ibuprofen(0.17 mg/L),naproxen(8.8 mg/L),ketoprofen(1.5 mg/L)and diclofenac(1.6 mg/L)were quantified.Hazard quotient(HQ)for various aquatic organisms were calculated for the effluents of WWTPs and Gurupura river water.The results showed medium risk of ibuprofen and naproxen to polyp Hydra attenuata.Continuous discharge of NSAIDs into the river can result in adverse effects to the resident organisms.
