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Thermal properties of polynorbornene (cis- and trans-) and hydrogenated polynorbornene

Summary

The thermal properties of trans-polynorbornene, cis-polynorbornene and hydrogenated polynorbornene were examined and its reversibility tested. Trans-polynorbornene samples, formed in various solvents, exhibit a softening range, from ambient temperature until 375 °C. However, syndiotactic cis-polynorbornene samples show a narrower melting range (between 150 and 375 °C). The fusion enthalpies of cis-polynorbornene samples are around 300-400 J/g. The temperature of decomposition is ca. 456 °C (minimum peak DSC) for trans-polynorbornene and ca. 466 °C, 10 °C higher, for cis-polynorbornene. The solvent used for the polymerization of norbornene has a negligible influence in the melting temperature range or in the decomposition temperature. The treatment with 2,6-di-tert-butyl-4-methyl-phenol during the isolation of polynorbornene leads to materials with different thermal properties. Trans-polynorbornene isolated without 2,6-di-tert-butyl-4-methyl-phenol exhibited an exothermic peak accompanied by an slight increase in weight (1-2%), while samples treated with 2,6-di-tert-butyl-4-methyl-phenol do not show these features.

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Correspondence to Juana Herrero.

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Esteruelas, M., González, F., Herrero, J. et al. Thermal properties of polynorbornene (cis- and trans-) and hydrogenated polynorbornene. Polym. Bull. 58, 923–931 (2007). https://doi.org/10.1007/s00289-007-0734-4

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  • DOI: https://doi.org/10.1007/s00289-007-0734-4

Keywords

  • Heat Flow
  • Exothermic Peak
  • Norbornene
  • Fusion Enthalpy
  • Polynorbornene