Synthesis and characterization of poly(butanediol sebacate-butanediol) terephthalate (PBSeT) reinforced by hydrogen bond containing amide group, with good mechanical properties and improved water vapor barrier

Abstract

Hydrogen-bonded PBSeT copolyesters are synthesized by introducing a polar amide unit into the molecular chain by adding decyldiamine. Two-step esteri cation and one-step polycondensation melt polymerization were adopted. ATR-FTIR and 1HNMR demonstrated the successful introduction of the amide unit. The effect of adding an amide unit on many properties was also discussed. Due to the formation of hydrogen bond, the force of the molecular chain is increased, the crystallinity is increased by 5.91%, and the yield strength and tear strength are increased by 40.7% and 74.8%, respectively. The addition of 1,10-decyldiamine has no signi cant effect on the glass transition temperature and thermal stability of polyester. The introduction of an amide unit decreased free volume and increased combined crystallinity, which also increased the water vapor barrier. At the same time, PBSeT copolyester still maintained its biodegradability under hydrolysis and enzymatic hydrolysis. This paper discusses a synthesis method of PBSeT copolyester strengthened by a hydrogen bond. The modi ed material has higher crystallinity, better mechanical properties, and a better water vapor barrier while maintaining certain biodegradation ability. It can be used in disposable products, food packaging, and other elds.

Ni(OH)2-SnO2 at the Hybrid Interface of Zeolite-Y and rGO for Electrochemical Oxidation of Methanol and Ethanol

“…The TGA results revealed that the Ni(OH) 2 located in the zeolite–carbon matrix was comparatively more stable. Similar enhancements in thermal stability have also been achieved by many other authors through hybridization with carbon materials. − …”

Original synthesis of polyvinyl butyral with a green deep eutectic solvent and a weakly polyacrylic acid from polyvinyl alcohol and the impacts of the chains structures of polyvinyl alcohol

“…Thermal gravimetric analysis (TGA) measurements can be launched to analyze the thermal stability and thermal decomposition of polymers. [ 43–46 ] TGA curves of PVBs with different molecular weights are given in Figure 3, which clearly indicates the presence of two main stages in the degradation of the PVBs. The decomposition of PVB‐1799 occurred in the temperature ranges of 280–510°C and 520–620°C, while PVBs with higher molecular weights degraded in the temperature ranges of roughly 250–450°C and 450–650°C.…”

Regulable surface hydroxyl group content in disperse ultrafine amorphous SiO2 nanoparticles

“…A weight loss with a broad shoulder between 200 and 800 • C occurs for all the samples and should be ascribed to the removal of silanol groups. 15,20,21,[50][51][52] For the amorphous SiO 2 NPs calcinated at 500 and 600 • C as well as calcinated at 600 and 800 • C and rehydroxylated, the weight loss associated with the silanol groups accounts for 1.0%, .6%, 2.5%, and 1.2%, respectively (Table 2). The amorphous SiO 2 NPs calcinated at 800 • C show almost no significant weight loss associated with the silanol groups.…”