Preparation of urea-poly(tetrahydrofuran) complexes and their application for fractionation of oligomers
1985
The synthesis of the urea channel inclusion complexes of poly(tetrahydrofuran)) (PTHF) is described. These complexes could be obtained in the form of single crystals forMn ≤ 1700 g/mol of PTHF as the guest, and they exhibit a hexagonal unit cell (a=8.20(2) A,c=11.05(3) A) very similar to the wellknown urea-n-alkane complexes. X-ray investigations, elemental analysis and density measurements suggest an all trans zig-zag conformation of the polymer chain.
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