Effect of salt additive on the formation of microporous poly(vinylidene fluoride) membranes by phase inversion from LiClO4/Water/DMF/PVDF system

Lin, Dar‐Jong; Chang, Cheng‐Liang; Huang, Fane-Ming; Cheng, Liao‐Ping

doi:10.1016/s0032-3861(02)00731-0

Cited by 199 publications

(103 citation statements)

References 23 publications

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“…The addition of inorganic particles has led to increased membrane permeability and improved control of membrane-surface properties [13,63]. Inorganic materials that can be blended with polymer include silica [64], ZrO 2 [65], and some small molecule inorganic salts, such as lithium salts [66]. Lu et al [46] reported that the permeation-flux increase of the modified membrane was attributed to increases in the surface hydrophilicity and the efficient filtration area due to the addition of hydrophilic inorganic nano-sized Al 2 O 3 particles.…”

Section: Uf Performancesmentioning

confidence: 99%

Polymer-nanoinorganic particles composite membranes: a brief overview

Han

2009

Front. Chem. Eng. China

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Polymer-nanoinorganic particles composite membranes present an interesting approach for improving the physical and chemical, as well as separation properties of polymer membranes, because they possess characteristics of both organic and inorganic membranes such as good permeability, selectivity, mechanical strength, thermal stability and so on. The preparations and structures of polymer-nanoinorganic particles composite membranes and their unique properties are reviewed.

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Section: Uf Performancesmentioning

confidence: 99%

Polymer-nanoinorganic particles composite membranes: a brief overview

Han

2009

Front. Chem. Eng. China

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“…The Ps forms either in the socalled para (antiparallel electron and positron spins: p-Ps) or ortho (parallel electron and positron spins: o-Ps) positronium states. [5][6][7][8] Positron annihilation is an experimental method by which one can obtain the microstructure, momentum of electrons, and defect behavior of condensed matter. Because the positron is sensitive to defects, vacancy, surface and interface, it has been turned into the best probe for defect research.…”

Section: Coincidence Doppler Broadening Spectroscopymentioning

confidence: 99%

Coincidence Doppler broadening spectroscopy in polyvinyl chloride after doping with Al₂O₃

Hamed

2008

J of Applied Polymer Sci

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Coincidence Doppler broadening of annihilation radiation (CDBAR) and Vickers hardness techniques were performed to study pure Al 2 O 3 , pure polyvinyl chloride (PVC), and doped PVC with different concentrations of Al 2 O 3 (10-50%). The CDBAR ratio curves with respect to pure PVC were presented and reflect the momentum distribution of all the samples. The peak around 14.5 3 1023 m o C in the CDBAR ratio curves suggests a large contribution of positron annihilation with the Al 2 O 3 . There is a linear correlation between the height of this peak and the Al 2 O 3 concentration. The S-and W-parameters were extracted from the CDBAR spectra and increase with increasing the Al 2 O 3 concentration showing discontinuity at 30% of Al 2 O 3 concentration on PVC. The present data confirmed that there is no positronium formation in pure Al 2 O 3 as a result of smaller S-parameter. The Vickers hardness increases with increasing the Al 2 O 3 concentration in PVC showing a linear dependence with two different slopes depend on the Al 2 O 3 concentration range. A correlation between the Vickers hardness (macroscopic data) and the W-parameter (microscopic data) was observed.

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“…The decreases in the onset of the melting temperature T m,o could be associated with the formation of crystalline defects or small size of crystals during precipitation as observed with the WAXD analysis of these samples (as discussed further in the next section). 50,51 In crystalline polymers, the factors contributing to the reduced melting temperature arise from the finite size of the crystallites, their state of internal perfection, and the interfacial and connecting regions. 52 Since crystallization is conducted at finite rates, the deviations from equilibrium that result manifest themselves in reduced thermodynamic stability and lower melting temperature of the crystallites formed.…”

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confidence: 99%

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

Mago

Kalyon

Fisher

2009

J of Applied Polymer Sci

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Carbon nanofibers (CNFs) have attracted significant interest because of their excellent mechanical, electrical, and physical properties. Recent advances in chemical functionalization strategies are anticipated to extend their utility in various applications. In this study, noncovalent methods of CNF functionalization utilizing solution crystallization and precipitation techniques were used to create hybrid nanostructures consisting of CNFs and poly(butylene terephthalate) (PBT). Key to this study is the finding that o-chlorophenol can be used as a suitable solvent to dissolve PBT to generate these nanostructures. PBT crystallization was documented via wideangle X-ray analysis and differential scanning calorimetry and was due to the nucleation effect of the CNFs. The sizes of the PBT crystals could be manipulated by altering the polymer concentration. The solution crystallization and precipitation techniques provide an alternative strategy to alter and control the nanostructure/polymer interface. The resulting nanohybrid structures may potentially find use in a broad range of applications including electronic devices, sensors, and as reinforcing agents in a polymer matrix.

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Effect of salt additive on the formation of microporous poly(vinylidene fluoride) membranes by phase inversion from LiClO4/Water/DMF/PVDF system

Cited by 199 publications

References 23 publications

Polymer-nanoinorganic particles composite membranes: a brief overview

Polymer-nanoinorganic particles composite membranes: a brief overview

Coincidence Doppler broadening spectroscopy in polyvinyl chloride after doping with Al₂O₃

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

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Effect of salt additive on the formation of microporous poly(vinylidene fluoride) membranes by phase inversion from LiClO4/Water/DMF/PVDF system

Cited by 199 publications

References 23 publications

Polymer-nanoinorganic particles composite membranes: a brief overview

Polymer-nanoinorganic particles composite membranes: a brief overview

Coincidence Doppler broadening spectroscopy in polyvinyl chloride after doping with Al2O3

Polymer crystallization and precipitation‐induced wrapping of carbon nanofibers with PBT

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Coincidence Doppler broadening spectroscopy in polyvinyl chloride after doping with Al₂O₃