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
用可逆加成-断裂链转移(RAFT)自由基聚合合成了分子量分布较窄的聚(N-乙烯基己内酰胺)(PNVCL),用红外光谱(FT-IR)、核磁共振氢谱(1 H NMR)和凝胶渗透色谱(GPC)对其结构进行了表征;用浊度法研究了无机盐、糖以及表面活性剂对PNVCL溶液低...用可逆加成-断裂链转移(RAFT)自由基聚合合成了分子量分布较窄的聚(N-乙烯基己内酰胺)(PNVCL),用红外光谱(FT-IR)、核磁共振氢谱(1 H NMR)和凝胶渗透色谱(GPC)对其结构进行了表征;用浊度法研究了无机盐、糖以及表面活性剂对PNVCL溶液低临界溶解温度(LCST)的影响。结果表明,NH4Br、NaBr、NH4Cl、NaCl使PNVCL溶液的LCST降低,但KI使PNVCL溶液的LCST升高,LCST降低或升高的程度主要取决于盐中阴离子的种类和离子浓度:糖的结构和浓度对PNVCL溶液的LCST有影响,十二烷基磺酸钠(SDS)则使PNVCL溶液的LCST升高。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).
文摘用可逆加成-断裂链转移(RAFT)自由基聚合合成了分子量分布较窄的聚(N-乙烯基己内酰胺)(PNVCL),用红外光谱(FT-IR)、核磁共振氢谱(1 H NMR)和凝胶渗透色谱(GPC)对其结构进行了表征;用浊度法研究了无机盐、糖以及表面活性剂对PNVCL溶液低临界溶解温度(LCST)的影响。结果表明,NH4Br、NaBr、NH4Cl、NaCl使PNVCL溶液的LCST降低,但KI使PNVCL溶液的LCST升高,LCST降低或升高的程度主要取决于盐中阴离子的种类和离子浓度:糖的结构和浓度对PNVCL溶液的LCST有影响,十二烷基磺酸钠(SDS)则使PNVCL溶液的LCST升高。
