Basko Andrey V, Pochivalov Konstantin V, Lebedeva Tatyana N, Yurov Mikhail Y, Zabolotnov Alexander S, Gostev Sergey S, Yushkin Alexey A, Volkov Alexey V, Bronnikov Sergei V
G A Krestov Institute of Solution Chemistry, Russian Academy of Sciences, ul. Akademicheskaya, 1, Ivanovo 153045, Russia.
N N Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina, 4, Moscow 119991, Russia.
Polymers (Basel). 2025 Jul 26;17(15):2044. doi: 10.3390/polym17152044.
A recently proposed method called "controlled swelling of monolithic films" was implemented to prepare ultra-high-molecular-weight polyethylene (UHMWPE) ultrafiltration membranes. For the first time, the effect of UHMWPE molecular weight (MW) on the structure and properties of the membranes prepared via this special case of thermally induced phase separation was studied in detail. The morphology and properties of the membranes were studied using SEM, DSC, liquid-liquid displacement porometry, and standard methods for the evaluation of mechanical properties, permeance, rejection, and abrasion resistance. High-quality membranes with a tensile strength of 5.0-17.8 MPa, a mean pore size of 25-50 nm, permeance of 17-107 L m h bar, rejection of model contaminant (blue dextran) of 72-98%, and great abrasion resistance can be prepared only if the MW of the polymer in the initial monolithic film is sufficiently high. The properties of the membranes can effectively be controlled by changing the MW of the polymer and the mass fraction of the latter in the swollen film. Shrinkage is responsible for the variation in the membrane properties. The membranes prepared from a higher-MW polymer are more prone to shrinking after the removal of the solvent. Shrinkage decreases before rising again and minimizes with an increase in the polymer content in the swollen film.
一种最近提出的名为“整体膜的可控溶胀”的方法被用于制备超高分子量聚乙烯（UHMWPE）超滤膜。首次详细研究了UHMWPE分子量（MW）对通过这种热致相分离特殊情况制备的膜的结构和性能的影响。使用扫描电子显微镜（SEM）、差示扫描量热法（DSC）、液-液置换孔径测定法以及评估机械性能、渗透率、截留率和耐磨性的标准方法对膜的形态和性能进行了研究。只有当初始整体膜中聚合物的分子量足够高时，才能制备出拉伸强度为5.0 - 17.8 MPa、平均孔径为25 - 50 nm、渗透率为17 - 107 L m⁻² h⁻¹ bar⁻¹、对模型污染物（蓝色葡聚糖）的截留率为72 - 98%且具有良好耐磨性的高质量膜。通过改变聚合物的分子量及其在溶胀膜中的质量分数，可以有效地控制膜的性能。收缩是导致膜性能变化的原因。由较高分子量聚合物制备的膜在去除溶剂后更容易收缩。收缩在再次上升之前会减小，并且随着溶胀膜中聚合物含量的增加而最小化。
