Within the purpose of developing more sustainable membrane systems, it is herein proposed to implement a biobased and biodegradable material, the poly(hydroxybutyrate-co-hydroxyvalerate) (PHBHV), to replace conventional polymers in a commonly used membrane fabrication process. The PHBHV based membranes were made by non-solvent induced phase separation (NIPS) using N-methyl-2-pyrrolidone (NMP) as solvent. The process parameters and dope solution composition were developed in order to give structures suitable for performances characterization. In that sense, the microstructures were characterized in case of non-supported and supported membranes. The addition of hydrophilic additives, ethylene glycol (EG) and polyethylene glycol 300 g mol⁻¹ (PEG300), was linked to the morphology changes. Porous asymmetric membranes were obtained in case of the non-supported membranes or supported membranes with a low amount of additive (1 wt%). Otherwise, symmetric porous membranes, made of interconnected crystal lamellas, were observed. The particularly high crystallinity of this biomaterial involved some different microstructures compared to classic polymers. Both types of structures demonstrated decent rejections of a clay dispersion. Due to the increased pore size, the permeabilities were greatly improved with the additives and values up to 480 L m⁻² h⁻¹.bar⁻¹ were achieved.

在开发更可持续的膜系统的目的中，本文提出实施生物基且可生物降解的材料聚（羟基丁酸酯-共-羟基戊酸酯）（PHBHV），以在常用的膜制造工艺中代替常规聚合物。基于PHBHV的膜是通过使用N-甲基-2-吡咯烷酮（NMP）作为溶剂的非溶剂诱导相分离（NIPS）制成的。开发了工艺参数和浓液溶液组成，以提供适合性能表征的结构。从这个意义上说，在无支撑和支撑膜的情况下，对微结构进行了表征。添加亲水性添加剂，乙二醇（EG）和聚乙二醇300 g mol ^-1（PEG300），与形态变化有关。在非支撑膜或具有少量添加剂（1重量％）的支撑膜的情况下，获得多孔的不对称膜。否则，观察到由相互连接的晶体薄片制成的对称多孔膜。与经典聚合物相比，这种生物材料的特别高的结晶度涉及一些不同的微观结构。两种类型的结构均表现出对粘土分散体的良好排斥。由于孔径的增加，使用添加剂极大地改善了渗透性，并实现了高达480 L m ^-2  h ^-1 .bar ^-1的值。