Preparation and Characterization of Head-to-Head Polymers 1331 of an amide linkage and a tetrahydropyran ring along the chains. Possible molecular arrangements providing all hydrogen bonds are ideally regularly formed between polymer chains are illustrated in Figure 7. In the presence of water hydrogen bond interactions must exist between the water molecules and the amide groups. The ring ether oxygens may also interact with the water molecules.Poly(BOL) film has been found to exhibit some extent of permeability and permselectivity for alkali metal ions in water. Further work is in progress on the properties of poly-(BOL) and will be published in the near future.Acknowledgment. Thanks are given to Mr. M. Ito for his help in the experimental work.References and Notes U) . K.

Head‐to‐head poly(vinyl cyclohexane) (H‐H PVCH) was prepared from 2,3‐diphenylbutadiene, which was polymerized by radical, 1,4 polymerization to poly(2,3‐diphenylbutadiene) and then catalytically hydrogenated to H‐H PVCH, H‐H PVCH was also prepared by catalytic hydrogenation of H‐H polystyrene (PS). The catalytic hydrogenations were carried out at an initial hydrogen pressure of 2000 psi and a temperature of 200°C. Some chemical, physical, and thermal properties of H‐H PVCH were investigated and compared with the properties of atactic and isotactic head‐to‐tail (H‐T) PVCH. The glass transition temperature of the H‐H polymer was found to be 50°C lower than that of the atactic H‐T polymer which indicates that the backbone chain has more flexibility. Both H‐H and H‐T PVCH showed comparable thermal stability. The temperature of the maximum rate of thermal degradation by differential thermogravimetric analysis was approximately 40°C higher than that of the corresponding polystyrenes.

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