Decanedioic acid

Commercial PHBV (ENMATTM Y1000P) in pellet form was purchased from Tianan Biologic Materials (Ningbo, China). As reported by the manufacturer, this biopolymer is characterized by a density of 1.23 g/cm³, a melt flow index (MFI) of 5–10 g/10 min (190 °C, 2.16 kg), and a 3 HV fraction of 2 mol %. Decanedioic acid, commonly known as sebacic acid (SbA) (molecular weight (M_W) of 202.25 g/mol and 99% purity), decamethylenediamine (DMDA) (M_W of 172.31 g/mol and purity of 97%), tetraDecanedioic acid (TTDDA) (M_W of 258.35 g/mol and purity of 99%), and 4-dimethylaminopyridine (DMAP) (M_W of 122.17 g/mol and purity of ≥99%) were all purchased at Sigma-Aldrich S.A. (Madrid, Spain). Sulfuric acid (96%) was provided by Vidrafroc S.A. (Barcelona, Spain) Sipernat D17 nanostructured SiO₂ microparticles, organomodified with dimethyldichlorosilane (≥97%), were provided by Evonik (Essen, Germany) and are claimed by the manufacturer to be of food-contact grade. The 1-butanol (BuOH) was acquired from Merck (Darmstadt, Germany). The 2,2,2-trifluoroethanol (TFE) (≥99%), methanol (MeOH) (≥99.8%), and formic acid (≥95%) were also obtained from Sigma-Aldrich S.A. (Madrid, Spain), whereas hexafluoro-2-propanol (HFIP) was obtained from Fluorochem (Hadfield, UK). Absolute ethanol and methanol (99.8%) were from Labkem-Labbox (Mataró, Spain). All of the reagents were used without further purification.