High-Performance Biobased Polyesters with High Gas Barrier, Glass Transition Temperature, and Tensile Strength Enabled by Hydrogen Bonds and Flexible Segments

Abstract

High-performance biobased polyesters with excellent thermal, mechanical, and gas barrier properties are in demand nowadays, while current design strategies have failed to endow polyesters with such integrated performances synchronously. Herein, we synthesize a series of furan-based copolyesters poly(butylene 4-hydroxy-N-(2-hydroxyethyl)2,5-furandicarboxylate) (PBA n F) containing an amide structure and flexible aliphatic segments in the main chains via condensed polymerization. The resultant copolyester PBA20F records balanced pre-eminent mechanical properties including tensile strength (78.0 MPa) and a large elongation at break (199%) while exhibiting a high glass transition temperature (54 °C) and a good enough gas barrier property. Such integrated excellent performances of copolyesters are ascribed to the combined effects of introduced intermolecular hydrogen bonds and flexible segments. Besides, PBA n Fs still display high optical transparency in the visible region. This work provides an innovative design strategy to prepare a new class of advanced furan-based copolyesters with remarkable mechanical, thermal, and gas barrier properties, thus supplying a series of promising high-performance biobased copolyesters for potential packaging applications.

High-Performance Biobased Elastomers with Both High Strength and High Toughness

“…51 In the XPS test, the signal of N 1s shifts toward a lower binding energy when N−H groups bond to HBs. 26,52 As displayed in Figure 1d, two peak components are identified, the peak at 400.6 eV assigned to free N−H groups and the peak of bonded N−H groups located at 399.0 eV. The above results illustrate the presence of a supramolecular HB network in the PA-BP x elastomers.…”

“…Additionally, the absorption peak of the amide II band decreases from 1544 to 1536 cm –1 , and the broad band at 3300 cm –1 , corresponding to the stretching vibration of N–H, reduces during the same heating process (Figure S6). In the XPS test, the signal of N 1s shifts toward a lower binding energy when N–H groups bond to HBs. , As displayed in Figure d, two peak components are identified, the peak at 400.6 eV assigned to free N–H groups and the peak of bonded N–H groups located at 399.0 eV. The above results illustrate the presence of a supramolecular HB network in the PA-BP x elastomers.…”

Biobased Biodegradable Copolyesters from 2,5-Thiophenedicarboxylic Acid: Effect of Aliphatic Diols on Barrier Properties and Degradation

“…The barrier improvement factor (BIFp) is used to visualize their barrier properties and is defined as the permeability coefficient of PBAT divided by those of PAAThs. As is well-known, various factors including the T g , degree of crystallinity, chain stiffness, hydrogen bonds, polarity moieties, and side groups of polyester can affect its interaction with gas molecules and hence determine its impermeability. − Among all samples, PPATh shows the highest blocking efficiency against CO 2 and O 2 with BIFps values of 4.3 and 3.3, respectively. Both the crystallization phase and short PDO segments lead to restricted chain mobility of the polyester and contribute to its good gas barrier performance.…”

Biodegradable Polyurethane Derived from Hydroxylated Polylactide with Superior Mechanical Properties

“…However, when the PLA-OH content increased to 30-40%, it exhibited better shielding capabilities for UVA (320−400 nm) and UVB (300−320 nm). The 30-40% PLA-PU samples blocked nearly 100% of UVB and most of UVA [57]. The transparency of the film was negatively affected by the higher PLA-OH content (Figure 3g).…”