四氢呋喃开环聚合的研究——Ⅴ.有机卤化物与高氯酸钠催化体系

<正> 我们曾对以有机卤化物与高氯酸银为催化体系引发四氢呋喃(THF)聚合进行了研究,但银盐较贵,且易使产物着色。以钠盐代替银盐可避免这些缺点,Eckstein,Drey fuss曾作过用不同金属离子代替银盐的研究工作,认为除汞盐外,以其它金属盐(包括钠盐)代替银盐时,其结果都使聚合反应变慢,收率也低。我们想了解其聚合慢的原因,并找到提高聚合速度的办法。此外我们还试验了不同催化剂用量对生成链末端基的影响。

STUDIES ON THE RING-OPENING POLYMERIZATION OF TETRAHYDROFURAN Ⅴ. OBGANIC HALO-COMPOUNDS AND SCODIUM PERCHLORATE AS BINARY CATALYST SYSTEMS

The low rate of tetrahydrofuran polymerization initiated by organic halo-compound and sodium perchlorate is attributed mainly to the relatively slow reaction of the two components of the catalyst. The rate can be raised by increasing the amount of sodium perchlorate. The influence of the amount of acetic chloride-sodium perchlorate catalyst on the hydroxyl functionlity of oligomer, obtained by hydrolyzing the product of polymerization was studied.