全氟磺酸树脂Nafion~ NR50溶液的制备

On Solubility of Perfluororesinsulfonic Acid

研究了全氟磺酸树脂 Nafion R○ NR5 0溶液的制备过程 .通过考察不同的溶剂体系 ,得到了 5种对Nafion R○ NR5 0具有良好溶解作用的溶剂体系 ,即 40 %～ 70 %水 +60 %～ 3 0 %乙醇、40 %～ 70 %水 +60 %～3 0 %正丙醇、1 0 %～ 70 %水 +90 %～ 3 0 %异丙醇、3 0 %～ 70 %水 +60 %～ 2 0 %正丙醇 +1 0 %甲醇和 1 0 %～70 %水 +80 %～ 2 0 %异丙醇 +1 0 %甲醇 .适宜的溶解温度为 2 3 0～ 2 5 0℃ ,溶解时间为 4h.在溶解的过程中 ,NR5 0催化醇发生异构化、醚化和脱水等反应 .甲醇起到促进 NR5

A series of system consisted of common solvents capable of dissolution of Nafion NR50 have been investigated: 40%~70% water+60%~30% ethanol, 40%~70% water+60%~30% n propanol , 10%~70% water+90%~30% i propanol, 30%~70% water+60%~20% n propanol+10% methanol and 10%~70% water+80%~20% i propanol+10% methanol. Favorable dissolution temperature and time appeared to be ranged in 230 ℃ to 250 ℃ and 4 hours, respectively. During the dissolution processes alcohols could be isomerized, etherified or dehydrated catalyzed by Nafion NR50. Addition of methanol could promote the swelling of NR50, accelerating the dissolution process.