Synthesis and characterization of aromatic copolyesters containing siloxane linkages in the polymer backbone

Abstract

ABSTRACT:A new series of aromatic copolyesters containing siloxane linkages were prepared by the melt polymerization of bisphenol A (BPA) with eugenol end-capped siloxane (EuSi), diphenyl terephthalate (DPT), and diphenyl isophthalate (DPI) in varying ratio in the temperature range 220 -290°C under reduced pressure in the presence of dibutyl tin dilaurate (DBTL) catalyst. The siloxane copolyesters prepared were characterized by FTIR, 1 H-NMR spectroscopy, solution viscosity, thermogravimetric analysis, differential scanning calorimetry, and X-ray diffraction. The effect of incorporation of eugenol end-capped siloxane was studied on the properties of BPA/DPI/DPT copolyesters. The glass-transition temperature of copolyester was decreased from 184 to 70°C by incorporation of 20% of eugenol endcapped siloxane. All copolyesters were found to be soluble in commonly used aprotic polar solvents and had filmforming properties.

High‐performance thermosets with tailored properties derived from methacrylated eugenol and epoxy‐based vinyl ester

“…Moreover, eugenol exhibits several pharmacological properties, such as antibacterial and antioxidant properties, because of the presence of phenol groups, leading to its utilization in perfume, cosmetic and flavoring applications . So far numerous studies have used eugenol as a building block for the synthesis of bio‐based polymers, such as benzoxazine resins, allyl‐etherified eugenol, polyester resins, cyanate ester resins, bismaleimide, epoxy resins, methacrylated eugenol (ME), etc . Among them, ME, prepared by incorporation of a polymerizable methacrylate group to eugenol, shows promising potential for use as a co‐monomer replacement for styrene in VE resins because both methacrylate groups and allyl groups can participate in free radical polymerization.…”

Curing mechanism, heat resistance, and anticorrosion properties of a furan/methyl phenyl silicone coating

“…In combination with Figure , the broad Si―O―H absorption peak of PSi/FR between 3300 and 3650 cm −1 almost disappears at 30°C, which can be attributed to the binding of Si―OH. The catalyst enhanced the activity of hydrogen atom, so Si―OH tended to interact with the aldehyde end of FR, allowing self‐cross‐linking through the condensation reaction of PSi . When the temperature was higher than 200°C, PSi partly underwent dehydrogenation and condensation reaction between silicon hydride and silicon hydrogen in the presence of the catalyst .…”

“…To investigate the curing mechanism of FR/PSi blends, the sample containing 20% FR was first characterized by FTIR before and after curing. 37 When the temperature was higher than 200°C, PSi partly underwent dehydrogenation and condensation reaction between silicon hydride and silicon hydrogen in the presence of the catalyst. 26 When the temperature is below 200°C, the hydroxyl-aldehyde condensation reaction occurs between aldehyde group in furan and hydroxyl group in methyl phenyl silicone, which followed by further reaction between two hydroxyl groups coming from furan and methyl phenyl silicone, which both build up covalent linkages between PSi and FR networks.…”

Explorations into the sustainable synthesis of cyclic and polymeric carbonates and thiocarbonates from eugenol-derived monomers and their reactions with CO2, COS, or CS2

“…[38][39][40] Eugenol based polyacrylates have also been used in orthopedic and dental cements. 41,42 Additionally, a variety of polymers have been synthesized from eugenol-based monomers such as polyacetylenes, 43,44 polycarbonate-siloxanes, 45 polyesters-siloxanes, 46 polybenzoxazines, 47 thermosetting bismaleimide resins 48 and cyanate esters. 49,50 In another study, oil-absorbent microspheres were prepared by suspension polymerization using eugenol-methacrylate for applications in wastewater treatment.…”