Polylactide (PLA) is a brittle biodegradable polymer: co-bonding of a higher flexibility polymer such as polybutylene adipate terephthalate (PBAT) into the PLA chains has been shown to make it...

As we can see in figure 2, the 1 H-NMR spectra of PBAT, PBS, and PHBV confirmed the chemical structure in figure 1 of each polymer by the presence of characteristic protons. The signal of aromatic...

The 1 H NMR spectra of neat PBAT show the peak of the CH group of the benzene ring in the BT unit at 8.10 ppm (a), while the butanediol outer and inner CH 2 groups of the BT segment can be detected at 4.37–4.44 ppm (b) and 1.66 ppm (e).

The 1 H NMR spectrum of the PBAT/PLA/biochar composite with the mass ratio of 90/10 after 70 days of incubation in water showed only the signals 1-7, corresponding to protons of the PBAT...

Nov 1, 2022 · 1 H NMR spectra of native and degraded PBAT in solution were performed on a Bruker Avance III HD spectrometer equipped with an inverse TCI 1 H/ 13 C/ 15 N cryoprobe. The spectra were recorded using a 30° pulse angle, 16 scans and a sweep width of 7500 Hz.

Sep 22, 2023 · In this study, we studied two poly (butylene adipate-random-terephthalate) PBAT random copolyesters samples with only a small difference in monomer composition ratios, which were carefully characterized by nuclear magnetic resonance (NMR) spectroscopy to reveal the detailed monomer sequence distribution.

Compared with linear PBAT, the 1 H NMR spectra of three branched PBAT copolyesters exhibited small but significant characteristic peaks at 5.1–5.4 ppm (Hf1–6). It can be determined that these characteristic peaks belong to the chemical shift C–H in the branch units. Considering the six branched structure sequences formed by the ring ...

Jul 24, 2024 · The 1 H NMR spectra were characterized by the Avance 400 NMR Spectrometer (Bruker, Switzerland). Specifically, deuterated chloroform and deuterated tetrahydrofuran were used as solvents, and the external magnetic field frequency was 400 MHz.

Apr 27, 2023 · The molecular structure of PBAT can be characterized by hydrogen nuclear magnetic resonance (1 H-NMR) and Fourier transform infrared (FTIR) spectroscopy. The 1 H-NMR spectrum of the PBAT dissolved in the CDCl 3 solvent was recorded on a …

Aug 28, 2020 · Nuclear magnetic resonance spectroscopy (1 H NMR) The 1 H NMR spectra were performed on a Bruker Avance 500 (DPX500 MHz, USA) in CDCl 3 solvent using tetramethyl silane (TMS) as an internal standard with 5 mg/mL concentrated polymer solution.