Abstract
The crystalline structure of a number of perfectly 1:1 alternating α-olefin:carbon monoxide aliphatic polyketones produced by the polymerisation of ethene with carbon monoxide (ECO polymers) and mixtures of ethene and propene with carbon monoxide (EPCO polymers) have been studied by wide angle X-ray scattering (WAXS), Raman spectroscopy and differential scanning calorimetry (DSC). It is further confirmed that both WAXS and Raman spectroscopy are suitable techniques for the characterisation of the two polymorphs (α and β) reported for these materials. DSC detected the presence of small endotherms around 100°C associated with the transition from the α to the β phase only in the ECO material. In accordance with previous work, it is found that the α/β ratio is the highest for the ECO polymer and decreases with increasing propene content in EPCO polymers. Above 2.9 mol% of propene incorporation, EPCO polymers show exclusively β phase. Heat of fusion (degree of crystallinity) and melting point decreased with increasing propene level, as expected. Accordingly, crystalline density (as determined by WAXS) and lattice interchain interaction (as determined by Raman) were also found to decrease by increasing the propene incorporation.
Sign-in/Register to access full text options 
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.
