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Cellulose

pp 1–16 | Cite as

Fabrication and characterization of cellulose triacetate porous membranes by combined nonsolvent-thermally induced phase separation

  • Xiao-Yan Xing
  • Lin Gu
  • Yu Jin
  • Rui Sun
  • Meng-Yun Xie
  • Qing-Yun WuEmail author
Original Research
  • 96 Downloads

Abstract

Cellulose triacetate (CTA) porous membranes were firstly prepared by the combined nonsolvent-thermally induced phase separation (N-TIPS) method. Dimethyl sulfone (DMSO2) and polyethylene glycol (PEG400) were respectively chosen as the TIPS solvent and additive of CTA, while water was used as the NIPS nonsolvent. Their Hansen solubility parameters were analyzed to understand the solution thermodynamics. Detailed investigation was applied on the effects of the polymer concentration, the coagulation bath temperature and the coagulation bath composition on the CTA porous membranes. It is found that both NIPS and TIPS effects simultaneously exist and compete with each other, and further affect the membrane morphology and performance. The NIPS effect can be promoted by lowering the CTA concentration or elevating the coagulation bath temperature, resulting in figure-like macropores and porous top surface. The obtained CTA porous membranes show a water flux as high as 2002.9 ± 55.2 L/m2h. On the contrary, the TIPS effect becomes the dominant factor, and leads to the symmetric sponge-like pores, which facilitate to enhance the mechanical properties. Besides, CTA porous membranes present large surface pore size as well as low fraction of figure-like macropores as increasing the DMSO2 content in the coagulation bath. These CTA porous membranes with excellent water permeability and mechanical strength are promising candidates for microfiltration or the porous substrates of thin film composite membranes.

Graphical abstract

Keywords

Cellulose triacetate Nonsolvent induced phase separation Thermally induced phase separation Membrane 

Abbreviations

CTA

Cellulose triacetate

CA

Cellulose acetate

PVDF

Poly(vinylidene fluoride)

TIPS

Thermally induced phase separation

NIPS

Nonsolvent induced phase separation

N-TIPS

Combined nonsolvent-thermally induced phase separation

RO

Reverse osmosis

PEG400

Polyethylene glycol

DMSO2

Dimethyl sulfone

PVA

Polyvinyl alcohol

NMR

Nuclear magnetic resonance spectroscopy

FESEM

Field emission scanning electron microscopy

ɛ

Porosity of membrane (%)

w0

Weight of wet membrane (g)

w1

Weight of dried membrane (g)

ρp

Density of CTA (g/cm3)

ρwater

Density of water (g/cm3)

Jw

Pure water flux (L/m2h)

V

Volume of penetrative water (L)

A

Effective membrane area (m2)

Δt

Testing time (h)

Ra

Hansen space (MPa1/2)

δd

Dispersion interaction (MPa1/2)

δp

Polar interaction (MPa1/2)

δh

Hydrogen bond interaction (MPa1/2)

Notes

Acknowledgments

This research is financially supported by the Natural Science Foundation of Zhejiang Province (No. LY18E030002), Natural Science Foundation of Ningbo (Nos. 2018A610111, 2017A610052), Key Laboratory of Marine Materials and Related Technologies (No. 2016K07), and K.C. Wong Magna Fund in Ningbo University.

Supplementary material

10570_2019_2347_MOESM1_ESM.doc (1.1 mb)
Supplementary material 1 (DOC 1116 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Xiao-Yan Xing
    • 1
  • Lin Gu
    • 2
  • Yu Jin
    • 1
  • Rui Sun
    • 1
  • Meng-Yun Xie
    • 1
  • Qing-Yun Wu
    • 1
    Email author
  1. 1.Faculty of Materials Science and Chemical EngineeringNingbo UniversityNingboPeople’s Republic of China
  2. 2.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboPeople’s Republic of China

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