Abstract
The structure, composition and temperature behaviour of polybutadienes prepared with binuclear metal complex catalysts immobilized on a solid carrier are investigated by differential scanning calorimetry, infra-red spectroscopy and X-ray scattering. Polybutadienes of nascent structure are blends of trans-1,4- and cis-1,4-homopolymers, whereas 1,2-units are randomly distributed in both macromolecules. The blends exhibit two-step melting characteristics for the crystalline trans-1,4-polybutadiene: the low-temperature transition from the monoclinic crystal form to the pseudohexagonal mesophase and the high-temperature transition from mesophase to the melt. A bimodal character of the endothermic maximum in DSC traces was observed for the former transition. In addition, it was shown that the nascent blend treated by hot toluene posseses a three-phase structure and contains, besides the well-known trans-1,4-polybutadiene crystalline and amorphous phases, an additional phase component of unknown structure.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
