Design Chemical Structures of CO<sub>2</sub>-Derived Poly(cyclohexene carbonate) Copolymers to Mediate Intra-/Intermolecular Interactions with Strong Hydrogen-Bonded Donor Homopolymer
Yen-Ling Kuan, Chih-Wei Chu, Wei-Ting Du, Shiao‐Wei Kuo
Abstract
High Resolution Image Download MS PowerPoint Slide The ring opening copolymerization (ROCOP) of CO 2 -based poly(carbonate- co -ester) (PC- co -PE) copolymers was synthesized by cyclohexene oxide (CHO), anhydrides (AH), and carbon dioxide (CO 2 ) with various contents of AH. Herein, phthalic anhydride and 1,2-cyclohexanedicarboxylic anhydride were chosen for prepared poly(cyclohexene carbonate- co -cyclohexane carboxylate) (PCHC-CHA) and poly(cyclohexene carbonate- co -phthalate) (PCHC-PA). Polycarbonate- co -polyester and polyester copolymers possess strong intramolecular H-bonding interactions on the polycarbonate (PC) or polyester (PE) segments, which was confirmed by two-dimensional Fourier transform infrared (2D FTIR) spectroscopy analyses. Compared to the PC segment, the OH units of poly(vinylphenol) (PVPh) preferred to form intermolecular hydrogen bonding with the polyester segment and possess a higher intermolecular association equilibrium constant ( K A ). The trend of intermolecular H-bonded strength was PVPh/PE-CHA > PVPh/PCHC-CHA > PVPh/PCHC-PA > PVPh/PCHC binary blends. Adjusting the PC % and PE % could improve the intra-/intermolecular hydrogen bonding ratio on the PVPh/PC- co -PE binary blend, which could be observed in the change of the q value ( q value generally corresponds to the H-bonding strength of the miscible polymer blend based on the Kwei equation) from DSC analyses.