Formation of isotactic polypropylene membranes with bicontinuous structure and good strength via thermally induced phase separation method

Lin, Yakai; Chen, G.; Yang, Jing‐hui; Wang, X.L.

doi:10.1016/j.desal.2007.10.044

Cited by 65 publications

(37 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Then, the cellular structure forms [5,13,15,17,18], and the water permeability depends greatly on the porosity on the polymer network, which is usually very low for amorphous polymer and semicrystalline polymer. Decreasing the content of polymer in polymer/diluent solution may possibly increase the water permeability at the cost of mechanical properties.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Preparation of polyethylene microporous membranes with high water permeability from thermally induced multiple phase transitions

Wang

Zhou

2015

Polymer

View full text Add to dashboard Cite

Section: A N U S C R I P Tmentioning

confidence: 99%

Preparation of polyethylene microporous membranes with high water permeability from thermally induced multiple phase transitions

Wang

Zhou

2015

Polymer

View full text Add to dashboard Cite

“…For example, PVDF membranes are made via phase inversion [5], whereas PTFE membranes are fabricated via stretching [6,7] or sintering. PP membranes can be fabricated via phase inversion [8] or stretching. Pore dimension of membranes for MD applications ranges from 10 -1 µm to 1 µm.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Hydrophobic Polymeric Membranes for Membrane Distillation Process

2010

View full text Add to dashboard Cite

Hydrophobic microporous membranes are utilized in membrane distillation (MD) processes, e.g. seawater desalination at moderate temperatures. The vapour permeability of commercial hydrophobic membranes with different pore sizes (0.2-1 micron) was characterized through a simple apparatus designed-on-purpose. A cylindrical vessel had a face closed by the membrane and the other connected to a thin graduate tube. The water level variation in the tube is recorded and related to the vapour flux across the membrane. Measurements were taken in the temperature range 20-80°C. A fan tangential to membrane surface was employed to maintain a constant driving force for vapour transport. Vapour flux did not depend on pore dimension, but the membrane and support material resulted to influence the mass transfer. Moreover, the results showed that the main resistance for mass transfer is located in the permeate side, thus addressing future works on the set up of a MD pilot unit.

show abstract

“…[7] Similar to the diagrams for the LDPE-containing systems, [3][4][5][6] it differs in two ways from the diagrams reported in the literature. [2,[8][9][10][11][12][13][14][15][16][17][18] (i) At low polymer concentrations the liquidus curve contains a horizontal segment AB with a constant temperature of complete amorphization of the polymer component, T am , whereas the binodal curve of LL phase separation is absent. (ii) There exists an additional borderline (BD) that admits a dual thermodynamic interpretation.…”

Section: Introductionmentioning

confidence: 99%

Phase Diagrams Semicrystalline Polymer–Liquid Revisited: Isotactic Polypropylene-Dibutyl Phthalate and Other Systems

Mizerovskii

Pochivalov

Kudryavtsev

et al. 2015

Journal of Macromolecular Science, Part B

View full text Add to dashboard Cite

The full phase diagram of an isotactic polypropylene (i-PP)-dibutyl phthalate (DBP) mixture is for the first time constructed by an optical method and discussed within the concept of semicrystalline polymers as microheterogeneous liquids with a threedimensional network structure. It is demonstrated that the liquidus in this and other polymer-solvent systems is not thermodynamically equivalent to the liquidus in low molecular weight (MW) mixtures. Qualitatively different thermal behavior of those two types of binary systems in the liquidus vicinity is corroborated by differential scanning calorimetry (DSC) experiments. In the former case, a liquid-solid transition resulting in the formation of polymer crystallites does not lead to separating the mixture into crystalline and amorphous phases. On cooling, the system remains macroscopically single phase until the low MW liquid can be fully dissolved in the amorphous regions of the polymer. The correct location of the corresponding borderline is crucially important for the microporous membrane formation via thermally induced phase separation (TIPS). It is also argued that the topology of a phase diagram polymer-low MW liquid does not depend on whether the polymer is amorphous or crystalline.

show abstract

Formation of isotactic polypropylene membranes with bicontinuous structure and good strength via thermally induced phase separation method

Cited by 65 publications

References 21 publications

Preparation of polyethylene microporous membranes with high water permeability from thermally induced multiple phase transitions

Preparation of polyethylene microporous membranes with high water permeability from thermally induced multiple phase transitions

Characterization of Hydrophobic Polymeric Membranes for Membrane Distillation Process

Phase Diagrams Semicrystalline Polymer–Liquid Revisited: Isotactic Polypropylene-Dibutyl Phthalate and Other Systems

Contact Info

Product

Resources

About