Effects of nucleating agents on preparation of polypropylene hollow fiber membranes by melt spinning process

2002 ◽  
Vol 10 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Bong Tae Kim ◽  
Kigook Song ◽  
Sung Soo Kim
Keyword(s):  
Hollow Fiber ◽  
Melt Spinning ◽  
Nucleating Agents ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes ◽  
Spinning Process

Effects of annealing stress field on the structure and properties of polypropylene hollow fiber membranes made by stretching

RSC Advances ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 4271-4279 ◽  
Author(s):  
Huiju Shao ◽  
Fujian Wei ◽  
Bin Wu ◽  
KaiZhou Zhang ◽  
Yong Yao ◽  
...  
Keyword(s):  
Stress Field ◽  
Microstructural Evolution ◽  
Hollow Fiber ◽  
Melt Spinning ◽  
Stress Fields ◽  
Structure And Properties ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes ◽  
Spinning Process

By adopting three types of annealing stress fields, this work focused on investigating their effects on the microstructural evolution of polypropylene (PP) hollow fiber precursors obtained by the melt spinning process.

Effects of post-treatment on the structure and properties of PVDF/FEP blend hollow fiber membranes

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 77407-77416 ◽  
Author(s):  
Qing-lin Huang ◽  
Yan-jie Wu ◽  
Chang-fa Xiao ◽  
Kai-kai Chen ◽  
Liang Song ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Polyvinylidene Fluoride ◽  
Melt Spinning ◽  
Post Treatment ◽  
Structure And Properties ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

Polyvinylidene fluoride (PVDF)/poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) blend hollow fiber membranes were prepared by the melt-spinning method.

Structural study of microporous polypropylene hollow fiber membranes made by the melt-spinning and cold-stretching method

1994 ◽  
Vol 93 (3) ◽  
pp. 209-215 ◽  
Author(s):  
Jae-Jin Kim ◽  
Tae-Seok Jang ◽  
Young-Don Kwon ◽  
Un Young Kim ◽  
Sung Soo Kim
Keyword(s):  
Structural Study ◽  
Hollow Fiber ◽  
Melt Spinning ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

scholarly journals Preparation of Polybenzimidazole Hollow-Fiber Membranes for Reverse Osmosis and Nanofiltration by Changing the Spinning Air Gap

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 113 ◽  
Author(s):  
Xiao Wang ◽  
Palitha Jayaweera ◽  
Radwan Alrasheed ◽  
Saad Aljlil ◽  
Yousef Alyousef ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Barrier Layer ◽  
Hollow Fiber ◽  
High Performance ◽  
Air Gap ◽  
Hollow Fiber Membranes ◽  
Barrier Layer Thickness ◽  
Fiber Membranes ◽  
Spinning Process ◽  
Surface Modified

High-performance polybenzimidazole (PBI) hollow-fiber membranes (HFMs) were fabricated through a continuous dry-jet wet spinning process at SRI International. By adjusting the spinning air gap from 4″ (10.2 cm) to 0.5″ (1.3 cm), the HFM pore sizes were enlarged dramatically without any significant change of the fiber dimensional size and barrier layer thickness. When fabricated with an air gap of 2.5″ (6.4 cm) and a surface modified by NaClO solution, the PBI HFM performance was comparable to that of a commercial reverse osmosis (RO) HFM product from Toyobo in terms of salt (NaCl) rejection and water permeability. The PBI RO HFM was positively surface charged in acidic conditions (pH < 7), which enhanced salt rejection via the Donnan effect. With an air gap of 1.5″ (3.8 cm), the PBI HFM rejected MgSO4 and Na2SO4 above 95%, a result that compares favorably with that achieved by nanofiltration. In addition, the PBI HFM has a defect-free structure with an ultra-thin barrier layer and porous sublayer. We believe PBI HFMs are ideal for water purification and can be readily commercialized.

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