Effect ofTween 80 on morphology and performance of poly(L‐lactic acid) ultrafiltration membranes

Abstract

Poly(L‐lactic acid) (PLLA) ultrafiltration (UF) membrane was fabricated by immersion precipitation method using Tween 80 as an additive. Membrane structure was characterized by scanning electron microscopy (SEM), porosity and pore size measurement, and atomic force microscopy (AFM). Membrane performance was evaluated by pure water flux, molecular weight cut‐off, and tensile test. It was found that the addition of Tween 80 into the casting solution significantly increased the permeability and molecular weight cut‐off of membrane. Tensile test confirmed that the as‐prepared PLLA membranes exhibited acceptable mechanical properties for ultrafiltration. Further, the role of Tween 80 in the process of membrane formation was analyzed and proposed. The addition of Tween 80 favored the formation of larger pores by interrupting the polymer chain entanglement and improving the miscibility between solvent and coagulant. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44428.

Enhancing Gas Permeation Properties of Pebax® 1657 Membranes via Polysorbate Nonionic Surfactants Doping

“…Indeed, the surfactant could interrupt polymer chain entanglements in the casting solution. This occurrence was considered as the cause for observed larger pores in ultrafiltration membranes based on poly(l-lactic acid) when using T80 as additive to the polymer dope solution [15]. In the present study, this effect is particularly evident for T20, which is more compatible with the PA6 and PEO segments in the polymer, as can be verified by comparing the Hansen solubility parameters reported in Table 2.…”

Improvement in antifouling and separation performance of PVDF hybrid membrane by incorporation of room‐temperature ionic liquids grafted halloysite nanotubes for oil–water separation

“…Then the porosity decreased slightly from 63.6% to 61.9% when increasing the ILHNTs concentration from 2.0 to 3.0 wt %. The mean pore radius decreased gradually with the addition of ILHNTs, indicating that ILHNTs were beneficial to result smaller pores during phase inversion . Besides, M‐HNTs‐1.0 had the biggest mean pore radius of 26.1 nm among all the membranes, which could be explained by the poor dispersibility of HNTs in membrane matrix.…”

“…As shown in Figure , the WCA decreased evidently from nearly 75° for M‐0 to 57° for M‐ILHNTs‐3.0. The enhancement of membrane hydrophilicity could be explained by the migration of ILHNTs to membrane surface in phase inversion process, which would affect the separation and antifouling performance of membranes.…”

“…These differences could be explained by membrane fouling mechanism. HA was prone to deposit on membrane surface to form a fouling layer that could be readily removed by washing, while BSA usually adsorbed on membrane surface or inside pores, causing more serious membrane fouling . On the basis of the fouling tests, it was concluded that the ILHNTs weakened the deposition and adsorption of the foulants on the membrane surface, and eventually endowed the PVDF membranes with better antifouling performance.…”

Poly(L-lactic acid) Depth Filter Membrane Prepared by Nonsolvent-Induced Phase Separation with the Aid of a Nonionic Surfactant

“…Recently, microfiltration and ultrafiltration membranes of poly(L-lactic acid) (PLLA) have been prepared by various methods (Tanaka and Lloyd, 2004;Tanaka et al, 2006Tanaka et al, , 2011Tanaka et al, , 2012Moriya et al, 2009;Gao et al, 2015;Minbu et al, 2015;Jiang et al, 2016;Domingues et al, 2016;Jiang et al, 2017;Xiong et al, 2017). PLLA is a biodegradable and compostable biomass plastic (Lunt, 1998;Gross and Kalra, 2002).…”