Abstract
We report here the fractionation and characterization of two crystalline ethylene/octene- 1 copolymer samples with octene-1 mole fractions of 0.028 and 0.089, synthesized in a solution continuous stirred-tank reactor (CSTR) using a constrained geometry catalyst (CGC) system. The samples were fractionated by preparative temperature rising elution fractionation (TREF), and the fractions were characterized by 13 C NMR, GPC and DSC. The copolymers were found to have narrow TREF curves, indicating the CGC system produces copolymers with narrow composition distributions. The fractionation was mainly determined by the short chain branching density in the copolymers. The polymer molecular weight also showed an effect on the fractionation for the copolymer with octene-1 mole fraction of 0.028. The first-order Markovian statistical model appeared to be more valid in predicting the comonomer dyad and triad distributions in the copolymer fractions. The combination of TREF and GPC was found to be an effective technique for the analysis of copolymers with low crystallinity.
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.
