Abstract
Polyoctenamers can be formed by the metathetic polymerization of cyclooctene. The trans/cis ratio in the products obtained depends on the catalyst employed and on the polymerization conditions. Polyoctenamers containing mainly trans double bonds are highly crystalline at room temperature. The commercially available trans-polyoctenamers (Vestenamer ®, trans content between 55 and 85%) develop particular properties as blend components in different rubbers and thermoplastics, thus favourably influencing the processing characteristics and the final product quality. The wide range of applications arises, at least in part, from the exceptional physical properties of these semicrystalline polyoctenamers. The melting temperature and the degree of crystallinity are related to the number and distribution of trans double bonds as well as on the sample history. The formation of crosslinks induced by very intense UV radiation of 100 μm thin films results in a reduction of the melting temperature, and the crystallinity is lowered. A correlation between stiffness (shear modulus G') and crystallinity was found for samples with varying amounts of trans double bonds up to 90%. This underlines the central role of the crystallinity in the prediction of the final product properties.
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