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化学学报
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化学学报 ›› 1979, Vol. 37 ›› Issue (2): 111-118. 上一篇    下一篇

论文

异戊二烯聚合催化体系Ln(naph)3-Al(i-C4H9) 3-Al2(C2H5) 3Cl3中稀土金属离子的价态

王佛松, 赵小江, 姜承德, 龚志   

  1. 中国科学院吉林应用化学研究所
  • 投稿日期:1978-02-01 发布日期:2013-06-03

THE VALENCE STATE OF RARE EARTH METAL IONS IN THE CATALYST SYSTEM Ln(naph)3-Al(i-C4H9)3-Al2(C2H5)3Cl3 FOR POLYMERIZATION OF ISOPRENE

WANG FO-SONG, ZHAO XIAO-JIANG, JIANG CHENG-DE, GONG ZHI   

  1. Kirin Institute of Applied Chemistry, Academia Sinica
  • Received:1978-02-01 Published:2013-06-03

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用光谱法研究了异戊二烯顺-1,4聚合催化体系Ln(napb)3-Al(i-C4H9)3-Al2(C2H5)3Cl3中稀土离子的价态.结果表明,在上述催化体系中,镨,钕,钆,铒部以三价形式存在,这说明上述稀土化合物催化活性的不同,不是因为价态有所差异.对不同条件下含Nd(naph)3的催化剂溶液的光谱及聚合活性研究结果表明,催化活性与Nd+3的特征吸收强度有关,吸收强度愈强,活性愈高.提高铝/钕克分子比及延长催化剂陈化时间,都导致特征吸收强度及催化活性的增大.

Spoctrophotometric study of the valence of rare earth ions in catalyst system Ln(napb)3-Al(i-C4H9)3-Al2(C2H5)3Cl3 has shown that ions of Pr, Nd, Gd, and Er in the catalyst system are in a valence state of 3, and the difference in Choir oatalytio activity toward isoprene polymerization is not due to the difference in their valence state. The catalytio activity of the system Ln(napb)3-Al(i-C4H9)3-Al2(C2H5)3Cl3 is related to the absorption intensity at 582 mμ. The stronger is the absorption, the higher is the catalytic activity. With increasing Al/Ln molar ratio and ageing time of the catalyst, the absorption intensity at 582 mμ and the catalytic activity are also inoreased.