Poly l-octenylene

The ring-opened polymer of cyclooctene was first marketed in 1980 by Chemische Werke Hills, Marl, Germany, under the trade name Vestenamer 8012. The number 8012 denotes that the product contains 80% trans double bonds and has a viscosity number of 120cm g when measured in 0.1% solution in toluene at 25°C. This polymer also goes under the name rra 5-polyoctenamer (TOR) (Streck 1982). In 1989 an expansion of the Huls plant brought its capacity up to 12 000 tons per year (Streck 1990a). The polymerization process uses a homogeneous WCle-based catalyst. 

Vestenamer 8012 possesses extremely unusual properties for an elastomer. At 20°C it is hard and has an exceptionally high viscosity above 60°C it becomes a fluid with a honey-like consistency. The hardness of the polymer at low temperature is the result of its crystallinity (33%) its fluidity at high temperature is the result of its relatively low MW (60000). The melting point of the unvulcanized polymer is 55°C and the glass transition temperature of the filler-free vulcanized polymer is —65°C. 

Thus Vestenamer 8012, used as a blending material, seems to offer considerable possibilities for the improvement of properties of the more common elastomers and can be expected to be used in various specialist applications wherever such improvements are critical. 

An additional type of Vestenamer has been developed with a lower trans content (62%) and therefore lower crystallinity (Vestenamer 6213) to provide for low-temperature applications, where the admixture of the standard type would lead to excessive stiffening (Schneider, W.A. 1988 Diedrich 1989 Streck 1990b). 

11 Polymers of norbornene derivatives 17.11.1 Polymers of ndo-dicyclopentadiene (DCPD) 

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ADMET polymers are easily characterized using common analysis techniques, including nuclear magnetic resonance ( H and 13C NMR), infrared (IR) spectra, elemental analysis, gel permeation chromatography (GPC), vapor pressure osmometry (VPO), membrane osmometry (MO), thermal gravimetric analysis (TGA), and differential scanning calorimetry (DSC). The preparation of poly(l-octenylene) (10) via the metathesis of 1,9-decadiene (9) is an excellent model polymerization to study ADMET, since the monomer is readily available and the polymer is well known.21 The NMR characterization data (Fig. 8.9) for the hydrogenated versions of poly(l-octenylene) illustrate the clean and selective nature of ADMET. 

Figure 8.9 (a) 200-MHz H NMR of linear poly(l-octenylene) produced by ADMET... 

Figure 8.10 GPC analysis of poly(l-octenylene) (10) and hydrogenated poly(octenamer) in trichlorobenzene at 135°C. [Reproduced with permission from Macromol. Chem., Rapid Commun. 14, 657-662 (1993). Copyright 1993 Wiley-VCH.]...

ACRONYM, ALTERNATIVE NAME. TRADE NAME TOR, poly(l-octenylene), Vestenamer (Hiils) CLASS Diene elastomers STRUCTURE (CH=CH(CH2)6) ... 

Metathesis polymers obtained from unsubstituted monocyclic olefins, such as cyclopentene or cyclooctene, can contain two types of repeating units. These are units in which the carbon-carbon double bond has the cis or trans configuration.Sequences of cis- and trans-enchained poly(l-octenylene) are shown in Figure 20.1. 

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