Abstract
X-ray and optical examination of a series of random copolymers of cis- and trans-tetramethylcyclobutane diol carbonates ranging in composition from 100 per cent cis- to 100 per cent trans- units showed that they were well crystalline over the whole range of composition. The pure cis- and pure trans-polymers occurred in distinct crystalline forms α and β respectively, with closely related unit cells. The random copolymers with trans- content of 29 to 61 per cent crystallized in a third crystal form, γ, with a unit cell related to the α and β forms. The linear melting point versus composition curve confirmed that mixed crystal formation was occurring in this range. The chain configuration and packing of the chains in the crystallites are discussed in relation to the crystalline forms, fibre repeat units and observed melting points.
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.
