| 摘要 |
An article of the present invention comprises a polymeric outer layer and a polymeric inner layer or core which core is made by ring-opening polymerization of a monomer that has tricyclic or a higher structure and contains at least one norbornene group. The article can be in the form of a roller having machined ends whereby the ends are made of the core material. The article can also be in the form such as circular, spiral spring, H-shaped, flat stock, and the like. The article is made by polymerizing the core material in situ by pouring liquid monomer mix into an outer sleeve where ring-opening polymerization at an elevated temperature takes place.
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