Effects of the species of crosslinking reagents on the structures and properties of biodegradable poly (butanediol sebacate ‐ butanediol terephthalate) copolyester

Abstract

In the present study, poly(butylene sebacate-co-terephthalate)s having different crosslinking reagents were synthesized with a random distribution by a two-step esterification and one-step polycondensation process. In detail, the using crosslinking agents were included trimethylolethane (TME), trimethylolpropane, tris(hydroxymethyl)aminoethane, glycerol (GL). Particularly, CS refers to a sample with no crosslinking agent added. The copolyester with TME was the least crystalline sample, and the melting peaks of all copolyesters corresponding to both, sebacate and terephthalate-rich phases were still observable in second calorimetric heating runs. These copolyesters were associated with interesting thermal and mechanical properties. The melting points of all samples were higher than 118 C and the puncture resistance and tensile strength of GL, the tear strength of TME, and the Young's modulus of all samples have been improved. Enzymatic degradability was assessed and the effect of composition and crystallinity on the degradation rate was investigated. The copolyester adding GL appears as a highly promising biodegradable material since it showed a significant weight loss during exposure to all selected degradation media, but also exhibited good performance and properties that were comparable to those characteristic of polyethylene. In brief, the improvement of PBSeT's puncture resistance, tear strength, and degradation performance is extremely important for the development and promotion of degradable foam, film, and elastomer materials.poly (butanediol sebacate -butanediol terephthalate), species of crosslinking reagents, structures and properties

Synthesis and Characterization of Poly(Butylene Sebacate-Co-Terephthalate) Copolyesters with Pentaerythritol as Branching Agent

“…The TGA and differential thermal gravimetric analysis (DTGA) thermograms are displayed in Figure 6 , and Table 3 lists the thermal properties of the PBSet copolyesters. The thermal decomposition of the PBSeT copolyesters occurred in two steps, which is consistent with previous studies [ 9 , 25 , 34 ]. The onset decomposition temperatures ( T onset ) of the PE-incorporated PBSeT copolyesters were slightly lower than that of the control sample without PE owing to the lower molecular weights of branched PBSeT copolymers.…”

“…Absorption peaks typical of the aliphatic moieties in PBSe were detected at 2930 and 2853 cm −1 ; these correspond to asymmetric and symmetric C-H stretching vibrations, respectively [ 9 ]. Other absorption peaks characteristic of PBSeT, such as the stretching vibration of C=O at 1715 cm −1 , stretching vibrations of C-O-C at 1100 and 1216 cm −1 , stretching vibrations of aromatic C-O at 1268 and 1165 cm −1 , and C-H stretching vibrations at 2930 and 2853 cm −1 , were also observed [ 9 , 10 , 25 , 34 , 35 ]. Broad absorption peaks associated with the terminal hydroxyl groups were observed at 3628 and 3543 cm −1 , while the peaks of the hydrogen-bonded hydroxyl groups appeared at 3448 and 3422 cm −1 , as reported previously [ 17 , 25 , 34 , 35 ].…”

“…Other absorption peaks characteristic of PBSeT, such as the stretching vibration of C=O at 1715 cm −1 , stretching vibrations of C-O-C at 1100 and 1216 cm −1 , stretching vibrations of aromatic C-O at 1268 and 1165 cm −1 , and C-H stretching vibrations at 2930 and 2853 cm −1 , were also observed [ 9 , 10 , 25 , 34 , 35 ]. Broad absorption peaks associated with the terminal hydroxyl groups were observed at 3628 and 3543 cm −1 , while the peaks of the hydrogen-bonded hydroxyl groups appeared at 3448 and 3422 cm −1 , as reported previously [ 17 , 25 , 34 , 35 ]. As the PE content in PBSeT increased, the intensities of the free and hydrogen-bonded hydroxyl peaks corresponding to hydroxyl end groups and hydrogen bonds tended to increase.…”

“…Sci. 2024, 25, x FOR PEER REVIEW 6 of 18 such as the stretching vibration of C=O at 1715 cm −1 , stretching vibrations of C-O-C at 1100 and 1216 cm −1 , stretching vibrations of aromatic C-O at 1268 and 1165 cm −1 , and C-H stretching vibrations at 2930 and 2853 cm −1 , were also observed [9,10,25,34,35]. Broad absorption peaks associated with the terminal hydroxyl groups were observed at 3628 and 3543 cm −1 , while the peaks of the hydrogen-bonded hydroxyl groups appeared at 3448 and 3422 cm −1 , as reported previously [17,25,34,35].…”