用X-射线光电子能谱仪(XPS)和胶体滴定法研究了聚N-乙烯基甲酰胺(PNVF)的碱性水解反应.结果表明PNVF水解产物的胺化度随着体系中碱浓度的增大而增大.在PNVF中含有约10%的非甲酰胺基团,由XPS谱图推论这些基团存在C O C结构.PNVF水解产物...用X-射线光电子能谱仪(XPS)和胶体滴定法研究了聚N-乙烯基甲酰胺(PNVF)的碱性水解反应.结果表明PNVF水解产物的胺化度随着体系中碱浓度的增大而增大.在PNVF中含有约10%的非甲酰胺基团,由XPS谱图推论这些基团存在C O C结构.PNVF水解产物的高解像度C 1s XPS谱图中,存在5种不同结合能的碳,各峰的变化与PNVF水解过程中的官能团变化规律一致.在285.5 eV处的峰为-CHNH2结构中的碳,归因于PNVF的-NHCHO水解为-NH2;胶体滴定和XPS谱图分析结果的比较表明:采用胶体滴定法测定氨基含量时,如果不考虑PNVF的纯度,将存在较大的误差.展开更多
Temperature sensitive poly(N vinylcaprolactam) was prepared by γ radiation polymerization.The effects of radiation dosage,radiation dose rate and monomer concentration on polymerization and the LCST characterisitcs o...Temperature sensitive poly(N vinylcaprolactam) was prepared by γ radiation polymerization.The effects of radiation dosage,radiation dose rate and monomer concentration on polymerization and the LCST characterisitcs of the polymer were studied.The results show that the polymer thus obtained has good temperature sensitivity and uniformity within certain radiation dosage range(1.4~4kGy) and dose rate range (2~14Gy/min).展开更多
文摘Temperature sensitive poly(N vinylcaprolactam) was prepared by γ radiation polymerization.The effects of radiation dosage,radiation dose rate and monomer concentration on polymerization and the LCST characterisitcs of the polymer were studied.The results show that the polymer thus obtained has good temperature sensitivity and uniformity within certain radiation dosage range(1.4~4kGy) and dose rate range (2~14Gy/min).