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用多金属氰化络合物(MMC)催化环氧丙烷开环均聚,考察了酸及起始剂对聚合诱导期的影响,以及转化单体/起始剂摩尔比、酸用量、加料方式及催化剂等对聚合物相对分子质量及其分布的影响。并用FTIR、1HNMR、SEC-MALLS对聚合产物结构进行了表征。结果表明,以MMC为催化剂,在w(H2SO4)<5×10-5、温度130℃、连续加料、w(MMC)>1×10-4时,所合成聚醚相对分子质量分布较窄(Mw/Mn=1.1~1.2),且相对分子质量可控;FTIR、1HNMR及SEC-MALLS分析结果表明,所合成聚醚具有预期结构。实验发现,聚合反应体系只存在一种活性中心,其机理可能为配位阳离子聚合。
The effect of acid and initiator on the induction period of polymerization and the mole ratio of monomer to initiator, the amount of acid and the method of feeding were investigated by using metal cyanide complex (MMC) And catalyst on the relative molecular mass of polymer and its distribution. The structure of the product was characterized by FTIR, 1HNMR and SEC-MALLS. The results showed that the relative molecular mass distribution of polyether was narrow with MMC as catalyst at w (H2SO4) <5 × 10-5, continuous feeding at 130 ℃, w (MMC)> 1 × 10-4 Mw / Mn = 1.1-1.2), and the relative molecular weight was controllable. The results of FTIR, 1HNMR and SEC-MALLS indicated that the synthesized polyether had the expected structure. The experimental results show that there is only one kind of active site in the polymerization system, and its mechanism may be coordination cationic polymerization.