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合成制备了聚磷腈类高分子——聚[(六氟异丙氧基)2-x(三氟乙氧基)x]磷腈,并通过NMR、FTIR、XRD、GPC、DSC等测试手段对聚合物进行了结构表征和性能测试,通过压力法透气性能测定仪测定了聚合物膜对N2、O2、CH4、CO2、He、H2等气体的透过性能.结果表明,三氟乙氧基的竞争取代能力较六氟异丙氧基稍强;得到x值分别为1.64、1.72和1.81的3种聚合物;其玻璃化温度Tg为-20.21℃、-42.83℃和-43.41℃;重均分子量为5.06×105、1.49×105和2.69×105;两种取代基比例适中时显示出较高的气体透过性能,渗透系数PN2=20barrer,PCO2=124barrer,PHe=85barrer;CO2/CH4和He/CH4的选择系数达到11.5和4.8,在天然气的净化和回收He中显示了潜力;H2/N2的选择系数达到6,而PH2=43barrer,在合成NH3尾气中回收H2存在发展前景。
The polyphosphazene polymer poly ([(hexafluoroisopropoxy) 2-x (trifluoroethoxy) x] phosphazenes was synthesized and characterized by means of NMR, FTIR, XRD, GPC and DSC The structural and characterization of the polymer was tested and the permeability of the polymer membrane to N2, O2, CH4, CO2, He, H2 and other gases was measured by pressure-type gas permeability tester. The results showed that trifluoroethoxy , Respectively. The three polymers with x values of 1.64, 1.72 and 1.81 were obtained respectively. The glass transition temperature Tg was -20.21 ℃, -42.83 ℃ and -43.41 ℃ respectively. The weight average The molecular weight is 5.06 × 105, 1.49 × 105 and 2.69 × 105, respectively. When the ratio of the two substituents is moderate, it shows high gas permeability. The permeability coefficient is PN2 = 20barrer, PCO2 = 124barrer, PHe = 85barrer. / CH4 has a selectivity coefficient of 11.5 and 4.8, showing potential in the purification and recovery of natural gas He; the selectivity coefficient of H2 / N2 reaches 6 and PH2 = 43 barrer, and there is a prospect for the recovery of H2 in the synthesis NH3 tail gas.