Diphenylacetylene monomers bearing a methylol group protected by a t-butyldiphenylsilyl group [tBuPh₂SiOCH₂C₆H₄C≡CC₆H₄R; R = SiMe₃ (1a) and R = SiMe₂nC₁₈H₃₇ (1b)] were synthesized and then polymerized with TaCl₅/n-Bu₄Sn to afford the corresponding poly(diphenylacetylene)s 2a and 2b, respectively. The molecular weights of 2a and 2b were high (i.e., M_w = 1,020,000 and 1,560,000, respectively), and free-standing membranes were obtained by solution casting. The deprotection of membranes of 2a and 2b using n-Bu₄N⁺F⁻ afforded poly(diphenylacetylene)s bearing methylol and silyl groups (3a and 3b). On the other hand, treatment of membranes of 2a and 2b with trifluoroacetic acid led to deprotection and desilylation, producing poly(diphenylacetylene)s bearing trifluoroacetate moieties (4a and 4b, respectively), and then treatment with methanol afforded poly(diphenylacetylene)s bearing only methylol groups (5a and 5b). The carbon dioxide permeability coefficients (P_CO2) of membranes of 2a and 2b were 99 and 78 Barrer, respectively. Deprotection led to the increment of CO₂ permeability without the decline of the CO₂ permselectivity. Poly(diphenylacetylene)s bearing methylol and silyl groups (3a and 3b) exhibited high permeability (P_CO2 = 2,000 and 120 Barrer, respectively), but not high permselectivity (P_CO2/P_N2 = 17 and 16, respectively). Methylol-group-containing poly(diphenylacetylene) without silyl groups 5b exhibited the best CO₂ permeation property, i.e., high CO₂ permeability and high permselectivity (P_CO2 = 220 Barrer, P_CO2/P_N2 = 32).

二苯基乙炔的单体轴承由一个受保护的羟甲基吨-butyldiphenylsilyl组[吨BUPH ₂的SiOCH ₂ ç ₆ ħ ₄ C≡CC ₆ ħ ₄ R等 合成R ＝ SiMe ₃（1a）和R ＝ SiMe ₂ n C ₁₈ H ₃₇（1b）]，然后与TaCl ₅ / n- Bu ₄ Sn聚合，分别得到相应的聚（二苯基乙炔）2a和2b。2a的分子量1b和2b是高的（即，M _w分别为1,020,000和1,560,000），并且通过溶液流延获得了自支撑膜。的膜的脱保护图2a和2b中使用Ñ -Bu ₄ Ñ ⁺ ˚F ^-得到聚（二苯乙炔）类轴承羟甲基和甲硅烷基（图3a和图3b）。另一方面，用三氟乙酸处理2a和2b的膜会导致脱保护和甲硅烷基化，产生带有三氟乙酸酯部分的聚二苯乙炔（4a和4b分别），然后用甲醇处理，得到仅带有羟甲基的聚二苯乙炔（5a和5b）。2a和2b的膜的二氧化碳渗透系数（P _CO2）分别为99和78 Barrer。脱保护导致CO的增量₂渗透性而不CO的衰落₂选择渗透性。带有羟甲基和甲硅烷基的聚二苯乙炔（3a和3b）显示出高渗透性（分别为P _CO2 = 2,000和120 Barrer），但选择性却不高（P _CO2 /P _N2分别为17和16）。没有甲硅烷基5b的含羟甲基的聚（二苯基乙炔）表现出最佳的CO ₂渗透性能，即高的CO ₂渗透性和高的选择性（P _CO2 = 220 Barrer，P _CO2 / P _N2 = 32）。