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Abstract
Bio-based unsaturated poly(butylene adipate-co-butylene itaconate) (PBABI) aliphatic copolyesters were synthesized with pentaerythritol (PE) as a modifier, observing the melting point, crystallization, and glass transition temperatures were decreased from 59.5 to 19.5 °C and 28.2 to −9.1 °C as an increase of itaconate concentration, and Tg ranged from −54.6 to −48.1 °C. PBABI copolyesters tend to the amorphous state by the existence of the BI unit above 40 mol%. The yield strength, elongation, and Young’s modulus at different BA/BI ratios were valued in a range of 13.2–13.8 MPa, 575.2–838.5%, and 65.1–83.8 MPa, respectively. Shear-thinning behavior was obtained in all BA/BI ratios of PBABI copolyesters around an angular frequency range of 20–30 rad s−1. Furthermore, the thermal and mechanical properties of PBABI copolyesters can be well regulated via controlling the itaconic acid contents and adding the modifier. PBABI copolyesters can be coated on a 3D air mesh polyester fabric to reinforce the mechanical property for replacing traditional plaster applications.
Highlights
Aliphatic copolyesters can be an eco-friendly, green material, bioresource, and excellent biodegradability material, and have a flexible chain and low melting point to limit their commercial applications due to weak mechanical characteristics [1,2,3,4,5]
Near half content of the C=C bonds of Itaconic acid (IA) can be reserved in various butylene adipate (BA)/butylene itaconate (BI) rates, meaning about 50% C=C bonds may be created saturated C–C bonds to drive a partial crosslinking network in poly(butylene adipate-co-butylene itaconate) (PBABI) copolyesters [8,9]
X-ray Diffraction (XRD) results of PBABI copolyesters in different BA/BI ratios have similar patterns compared to PBA, suggesting that the crystal panel of the BA unit could not be flustered by the existence of the BI unit below BA/BI =7/3 and tend to amorphous state at BA/BI = 6/4 and 5/5
Summary
Aliphatic copolyesters can be an eco-friendly, green material, bioresource, and excellent biodegradability material, and have a flexible chain and low melting point to limit their commercial applications due to weak mechanical characteristics [1,2,3,4,5]. There are many methods to improve their mechanical properties, such as adding nanoparticles, crosslinking agents, chain extenders, etc. The slight content crosslinking modifier can be adopted to tune the mechanical property of synthesizing unsaturated copolyesters to obtain a suitable toughness property for its further applications. The modifier can be selected with a multi arms end group with –OH and –COOH residues utilized in copolyesters; e.g., benzene-1,3,5-tricarboxylic acid and glycerol with the tri-arm; 2,2-bis(hydroxymethyl). A slight content (0.01–0.3 mole%) of multifunctional end groups on aliphatic copolyesters
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