Melting temperature of trans‐polyoctenamer

Abstract

The effect of microstructure on crystallizability of polyoctenamers prepared by R3Al‐WCl6 catalyst was studied. The results indicate that polyoctenamers with a broad range of trans‐vinylene content do crystallize. The measured melting points are dependent on the trans‐vinylene content. From the dependence of melting temperature on copolymer composition, a value of 73 ± 2°C. for the melting point and a molar heat of fusion ΔHu of 3520 cal./mole are calculated for 100% trans‐polyoctenamer. From the melting point depression in the presence of diluent, a value for ΔHu of 4800 cal./mole is obtained.

Some aspects of the synthesis and characterization of special polymers and oligomers by olefin metathesis

“…The concentration of the monomers 1-1Vwas almost zero or constant after ca. 20 rain, but the reactions were run up to 20 h. The content of E(trans) C = C double bonds of the copolymers received was 60-90%, estimated by IR-spectroscopy [17,18]. In addition homopolymerization experiments with the monomers 1-111 were carried out.…”

Optical and shape memory properties of semicrystalline poly(cyclooctene) upon cold‐drawing

“…Poly(cyclooctene) (PCO) is a thermoplastic polymer with long, linear alkenamer chains . When cold‐drawn and then heated to nearly its melting temperature, PCO recovers from deformation (generated by the cold drawing) through increased chain movement and physical crosslinking in the alkenamer chains; that is, it exhibits shape memory behavior.…”

The microstructure of trans-polyoctenamer

“…With increasing trans content both melting point and crystallinity increase [1,5]. For TOR with low trans contents ('cis-polyoctenamer'), a decrease of melting temperature as well as of intrinsic viscosity with increasing trans content can be found.…”

“…The morphological parameters of TOR are primarily determined by the configuration of the double bonds, i. e. crystallinity, melting temperature and crystallization rates are highly effected by the cis or trans configuration [1][2][3][4][5]. With increasing trans content both melting point and crystallinity increase [1,5].…”