Process for preparing a polymer having a 2,5-furandicarboxylate moiety within the polymer backbone and such (co)polymers
A process for preparing a polymer having a 2,5-furandicarboxylate moiety within the polymer backbone and having a number average molecular weight of at least 10,000 (as determined by GPC based on polystyrene standards) includes a first step where a prepolymer is made having the 2,5-furandicarboxylate moiety within the polymer backbone, followed in a second step by a polycondensation reaction. Polymers so produced may have a 2,5-furandicarboxylate moiety within the polymer backbone, and having a number average molecular weight of at least 20,000 (as determined by GPC based on styrene standards), and an absorbance as a 5 mg/mL solution in a dichloromethane:hexafluoroisopropanol 8:2 at 400 nm of below 0.05.
1. A polymer having a 2,5-furandicarboxylate moiety within the polymer backbone, and having a number average molecular weight of at least 20,000 (as determined by GPC based on styrene standards), and an absorbance as a 5 mg/mL solution in a dichloromethane:hexafluoroisopropanol 8:2 at 400 nm of below 0.05, the polymer being poly(ethylene 2,5-furan-dicarboxylate).
2. The polymer according to claim 1 , having a number average molecular weight of at least 20,000, as determined by GPC using an HPLC system and a chloroform/2-chlorophenol mixture as eluent.
3. The polymer according to claim 2 , wherein the GPC measurements were performed on a Merck-Hitachi LaChrom HPLC system equipped with two PLgel 10 μm MIXED-C(300*7.5 mm) columns wherein a chloroform:2-chlorophenol 7:3 solvent mixture was used as eluent.