NR(natural rubber)based and its blend with BR(polybutadiene rubber)and NBR(nitrile rubber)composites were synthesized using reinforcing filler and other relevant additives.PCNSL(phosphorylated cashew nut shell liquid)...NR(natural rubber)based and its blend with BR(polybutadiene rubber)and NBR(nitrile rubber)composites were synthesized using reinforcing filler and other relevant additives.PCNSL(phosphorylated cashew nut shell liquid)modified kaolin,SRSO(sodium salt of rubber seed oil)modified kaolin and commercially available cloisite 30b were used as filler for reinforcement to achieve improved mechanical properties.Kaolin was modified with PCNSL either in two methods,by solvent treated method or sodium salt method and varying concentrations were prepared for comparison.No rate of intercalation was found with solvent treated PCNSL,but achieved with sodium salt of PCNSL.While comparing SRSO and SPCNSL,it is found that better intercalation and property improvement were achieved with only SRSO,since it possesses up to 18 carbon atoms in the side chain than the PCNSL with 15 carbon atoms side chain.展开更多
将矿粉与还原剂混合制成含碳球团是强化矿物还原过程的有效途径之一.前期实验研究证实含碳球团方案可有效提高天青石(SrSO_4)的还原效率.本文进一步对其还原过程的热力学及动力学展开研究,通过热力学计算结果表明,足量的还原剂可以有效...将矿粉与还原剂混合制成含碳球团是强化矿物还原过程的有效途径之一.前期实验研究证实含碳球团方案可有效提高天青石(SrSO_4)的还原效率.本文进一步对其还原过程的热力学及动力学展开研究,通过热力学计算结果表明,足量的还原剂可以有效抑制O_2对SrSO_4还原过程的影响; C/O摩尔比和还原温度共同影响SrSO_4还原后的产物构成,在适宜的C/O摩尔比和还原温度下,SrSO_4的还原产物仅为Sr S.通过对SrSO_4含碳球团还原过程的动力学参数的拟合表明,含碳球团中的SrSO_4还原过程遵循界面反应模型,其反应表面活化性为105.4 k J/mol.展开更多
SrSO4：Dy,Tb nanocrystalline with crystalline size in the range of 44-54 nm was prepared by co-precipitation method followed by thermal treatment and characterized by X-ray diffraction （XRD）, scanning electron micro...SrSO4：Dy,Tb nanocrystalline with crystalline size in the range of 44-54 nm was prepared by co-precipitation method followed by thermal treatment and characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDX） and UV-visible spectrometry. Our results provided direct evidence of incorporation of impurities into nanocrystalline SrSO4. The thermoluminescence （TL） properties of SrSOn：Dy,Tb nanocrystalline pellets irradiated with gamma rays at different doses were studied. The TL glow curve of SrSOa：Dy,Tb nanocrystalline pellets had a prominent peak at around 490 K and a small peak at around 430 K. The major peak in the TL glow curve was almost resolved from other peaks, which was analyzed using Chen＇s peak shape method to determine the TL kinetic parameters such as activation energy, E and kinetic order, b. The intensity of main dosimetric peak of SrSO4：Dy,Tb nanocrystalline pellets at around 490 K increased linearly with the increase in gamma dose. The TL response was linear in the range of 0.1-7 kGy. These properties made it a candidate as a dosimeter to be used for estimating the high dose of gamma rays.展开更多
文摘NR(natural rubber)based and its blend with BR(polybutadiene rubber)and NBR(nitrile rubber)composites were synthesized using reinforcing filler and other relevant additives.PCNSL(phosphorylated cashew nut shell liquid)modified kaolin,SRSO(sodium salt of rubber seed oil)modified kaolin and commercially available cloisite 30b were used as filler for reinforcement to achieve improved mechanical properties.Kaolin was modified with PCNSL either in two methods,by solvent treated method or sodium salt method and varying concentrations were prepared for comparison.No rate of intercalation was found with solvent treated PCNSL,but achieved with sodium salt of PCNSL.While comparing SRSO and SPCNSL,it is found that better intercalation and property improvement were achieved with only SRSO,since it possesses up to 18 carbon atoms in the side chain than the PCNSL with 15 carbon atoms side chain.
文摘将矿粉与还原剂混合制成含碳球团是强化矿物还原过程的有效途径之一.前期实验研究证实含碳球团方案可有效提高天青石(SrSO_4)的还原效率.本文进一步对其还原过程的热力学及动力学展开研究,通过热力学计算结果表明,足量的还原剂可以有效抑制O_2对SrSO_4还原过程的影响; C/O摩尔比和还原温度共同影响SrSO_4还原后的产物构成,在适宜的C/O摩尔比和还原温度下,SrSO_4的还原产物仅为Sr S.通过对SrSO_4含碳球团还原过程的动力学参数的拟合表明,含碳球团中的SrSO_4还原过程遵循界面反应模型,其反应表面活化性为105.4 k J/mol.
文摘SrSO4：Dy,Tb nanocrystalline with crystalline size in the range of 44-54 nm was prepared by co-precipitation method followed by thermal treatment and characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDX） and UV-visible spectrometry. Our results provided direct evidence of incorporation of impurities into nanocrystalline SrSO4. The thermoluminescence （TL） properties of SrSOn：Dy,Tb nanocrystalline pellets irradiated with gamma rays at different doses were studied. The TL glow curve of SrSOa：Dy,Tb nanocrystalline pellets had a prominent peak at around 490 K and a small peak at around 430 K. The major peak in the TL glow curve was almost resolved from other peaks, which was analyzed using Chen＇s peak shape method to determine the TL kinetic parameters such as activation energy, E and kinetic order, b. The intensity of main dosimetric peak of SrSO4：Dy,Tb nanocrystalline pellets at around 490 K increased linearly with the increase in gamma dose. The TL response was linear in the range of 0.1-7 kGy. These properties made it a candidate as a dosimeter to be used for estimating the high dose of gamma rays.
