Wang Chengqian, Chen Mingkun, Jiang Zhiguo, Qiu Zhaobin
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Polymers (Basel). 2023 Jan 13;15(2):427. doi: 10.3390/polym15020427.
Poly (hexamethylene succinate) (PHS) is a biobased and biodegradable polyester. In this research, two fully biobased high-molecular-weight poly (hexamethylene succinate--2,5-furandicarboxylate) (PHSF) copolyesters with low hexamethylene furandicarboxylate (HF) unit contents (about 5 and 10 mol%) were successfully synthesized through a two-step transesterification/esterification and polycondensation method. The basic thermal behavior, crystal structure, isothermal crystallization kinetics, melting behavior, thermal stability, and tensile mechanical property of PHSF copolyesters were studied in detail and compared with those of PHS. PHSF showed a decrease in the melt crystallization temperature, melting temperature, and equilibrium melting temperature while showing a slight increase in the glass transition temperature and thermal decomposition temperature. PHSF copolyesters displayed the same crystal structure as PHS. Compared with PHS, PHSF copolyesters showed the improved mechanical property. The presence of about 10 mol% of HF unit increased the tensile strength from 12.9 ± 0.9 MPa for PHS to 39.2 ± 0.8 MPa; meanwhile, the elongation at break also increased from 498.5 ± 4.78% to 1757.6 ± 6.1%.
聚（己二酸己二醇酯）（PHS）是一种生物基可生物降解聚酯。在本研究中，通过两步酯交换/酯化和缩聚方法成功合成了两种具有低六亚甲基呋喃二甲酸酯（HF）单元含量（约5和10摩尔%）的全生物基高分子量聚（己二酸己二醇酯-2,5-呋喃二甲酸酯）（PHSF）共聚酯。详细研究了PHSF共聚酯的基本热行为、晶体结构、等温结晶动力学、熔融行为、热稳定性和拉伸力学性能，并与PHS进行了比较。PHSF的熔体结晶温度、熔融温度和平衡熔融温度降低，而玻璃化转变温度和热分解温度略有升高。PHSF共聚酯与PHS具有相同的晶体结构。与PHS相比，PHSF共聚酯的力学性能有所改善。约10摩尔%的HF单元的存在使拉伸强度从PHS的12.9±0.9MPa提高到39.2±0.8MPa；同时，断裂伸长率也从498.5±4.78%提高到1757.6±6.1%。
