Urea-polyethylene inclusion complex

Experiments on two types of materials will be presented, namely (1) a powder of solution-grown polyethylene, Sholex 6050, and (2) a urea-polyethylene inclusion complex, in which polyethylene is of the same origin. The inclusion complexes of urea and low-molecular-weight hydrocarbon molecules have been studied extensively for more than thirty years, but the urea-polyethylene complex (UPEC) was successfully prepared rather recently. We prepared the complex according to the method described by Monobe et al. 

Motional Character of the Polyethylene Chain in the Urea-Polyethylene Inclusion Complex... 

In Sects. 5 and 6, a few investigations of urea-polyethylene complexes (UPEC) were discussed. The UPEC is an interesting material because a single polyethylene chain is located in an hexagonal canal of urea molecules and it must be expected that the polyethylene chain can behave differently from the bulk systems like solution-grown crystals or materials recrystallized from the melt. The inclusion complex system composed of short hydrocarbon molecules and urea molecules was studied more than 30 years ago. The crystalline structures of urea-hydrocarbon complexes are known The urea-polyethylene complex system was prepared rather recently by Monobe et al. , replacing the hydrocarbon molecules in the urea-hydrocarbon complex by... 

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