Synthesis and Characterization of Photocrosslinked Biobased Polyester Membrane

Abstract

A series of bio-based photocrosslinked polyester membranes, poly(1,8-octanediol-itaconate-citrate-dodecandioate), (POSCI) were synthesized through polycondensation followed by photocrosslinking under UV irradiation in the presence of 2,2-dimethoxy-2-phenylacetophenone (DMPA) as photoinitiator (PI). Upon varied UV exposure time and DMPA content, the corresponding changes in chemical, structural, and mechanical properties of the polymer were studied. The transmission peak of FTIR spectrum centred at 1725 cm-1 indicates the formation of ester structure. Contact angle results suggested all of the synthesized POSCI membranes had hydrophilic properties as their contact angle is less than 90 °. Sol-gel analysis shows that the swelling ratio of POSCI decreases while the gel fraction increases with increasing in photocrosslinking time. The tensile strength of POSCI, thus, increased correspondingly with longer UV exposure. Excess DMPA, however, proved otherwise.

Photo-triggered Sustainable Adhesive Based on Itaconic Acid

“…Photo-induced modulation of the photocured polymer was further investigated by exposing IAP (3:1) to increasing UV irradiation times from 1 min (IAP-1) to 30 min (IAP-30). When the prepolymer was exposed under UV irradiation, the DMPA added at the end of the polycondensation initiated the FRP. − Therefore, the intensity of the stretching vibration observed at 1636 cm –1 attributed to C  CH 2 in IA decreased with longer UV exposure time (Figure A). As expected, the intensity of the stretching vibration at 2850 and 2916 cm –1 representing CH 2 – CH 2 increased correspondingly as more methylene cross-links were formed. ,,, Through deconvolution of the FTIR spectra, the area of the C  CH 2 peak was quantified and applied to calculate the percentage of C  CH 2 conversion (see details in Supporting Information, Figure S1).…”