Liu Min, Zhao Long-Bao, Yu Li-Yun, Wei Yong-Ming, Xu Zhen-Liang
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology (ECUST), 130 Meilong Road, Shanghai 200237, China.
State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center, ECUST, 130 Meilong Road, Shanghai 200237, China.
Polymers (Basel). 2020 Feb 8;12(2):383. doi: 10.3390/polym12020383.
A homologous series of hyperbranched polyesters (HBPEs) was successfully synthesized via an esterification reaction of 2,2-bis(methylol)propionic acid (bis-MPA) with pentaerythritol. The molecular weights of the HBPEs were 2160, 2660, 4150 and 5840 g/mol, respectively. These HBPEs were used as additives to prepare polysulfone (PSf) hollow fiber membranes via non-solvent induced phase separation. The characteristic behaviors of the casting solution were investigated, as well as the morphologies, hydrophilicity and mechanical properties of the PSf membranes. The results showed that the initial viscosities of the casting solutions were increased, and the shear-thinning phenomenon became increasingly obvious. The demixing rate first increased and then decreased when increasing the HBPE molecular weight, and the turning point was 2660 g/mol. The PSf hollow fiber membranes with different molecular weights of HBPEs had a co-existing morphology of double finger-like and sponge-like structures. The starting pure water contact angle decreased obviously, and the mechanical properties improved.
通过2,2-双（羟甲基）丙酸（双-MPA）与季戊四醇的酯化反应成功合成了一系列同系超支化聚酯（HBPEs）。这些HBPEs的分子量分别为2160、2660、4150和5840 g/mol。将这些HBPEs用作添加剂，通过非溶剂诱导相分离制备聚砜（PSf）中空纤维膜。研究了铸膜液的特性行为以及PSf膜的形态、亲水性和力学性能。结果表明，铸膜液的初始粘度增加，剪切变稀现象越来越明显。随着HBPE分子量的增加，分层速率先增加后降低，转折点为2660 g/mol。具有不同分子量HBPEs的PSf中空纤维膜具有双指状和海绵状结构共存的形态。起始纯水接触角明显降低，力学性能得到改善。
