Effects of nucleating agents and extractants on the structure of polypropylene microporous membranes via thermally induced phase separation

Luo, Bin; Zhang, Jun; Wang, Xiaolin; Zhou, Yuan; Wen, Jianzhi

doi:10.1016/j.desal.2005.10.013

Cited by 39 publications

(37 citation statements)

References 5 publications

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“…The appearance of this line facilitates the under standing of the formation of microporous membranes from solutions of semicrystalline polymers via ther mally induced phase separation [11,13,15,18,[29][30][31][32][33][34][35].…”

Section: Resultsmentioning

confidence: 99%

Phase equilibrium of a semicrystalline polymer-liquid system: Isotactic polypropylene-dibutylphthalate

et al. 2015

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A hypothesis proposed for semicrystalline polymers as metastable, microheterogenous, three dimensionally structured liquids with crystallites as grid sites is developed. The phase diagram of the isotactic polypropylene (PP)-dibutyl phthalate system obtained via this approach is discussed in detail. Additional arguments for the thermodynamic nonequivalence of the liquidus line in this and similar systems, on one hand, and in the systems of low molecular mass crystalline-liquids, on the other hand, are given. The appearance of a boundary curve, reflecting the transition of the original two phase system into a single phase, such as a liquid solution in a polymer, on the phase diagram of the semicrystalline polymer-liquid system is shown to fundamentally change the technological meaning of the diagram, thereby clarifying the mechanism of microporous membrane formation from solutions of semicrystalline polymers via thermally induced phase separation.

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Section: Resultsmentioning

confidence: 99%

Phase equilibrium of a semicrystalline polymer-liquid system: Isotactic polypropylene-dibutylphthalate

et al. 2015

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“…4 It is worth pointing out that our revision of phase diagrams for semicrystalline polymer-solvent mixtures has an important practical aspect. Such diagrams are used as a guidance for developing technologies of microporous membranes [10,11,15,17,[31][32][33][34][35][36][37] and other functional polymers [38,39] applications via the method of thermally induced phase separation (TIPS). This method implies fast cooling of the mixture from a homogeneous state to a certain state below the liquidus curve.…”

Section: Comparing To Other Systemsmentioning

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

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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.

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“…Also, the membrane manufactured by the wet process is non-oriented for both pore structure and mechanical strength. [5][6][7][8] However, these polyolefin membranes have some disadvantages such as a poor compatibility with liquid electrolytes due to their hydrophobic property, and a large thermal shrinkage. 9 10 Inorganic fillers are compounded into thermoplastic polymers to improve their thermal, mechanical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

High Density Polyethylene Membrane Filled with Alumina Prepared by a Gamma Ray Irradiation

Park

Sung²,

Lim³

et al. 2011

J. Nanosci. Nanotech.

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High density polyethylene (HDPE) membrane filled with alumina particles was prepared by a wet process for a Li-ion secondary battery. Soybean oil and dibutyl phthalate (DBP) were premixed as the co-diluents. Gamma ray irradiation was used for crosslinking of HDPE. The HDPE membrane filled with alumina particles had excellent mechanical property and thermal stability due to the alumina particles and irradiation crosslinking. The tensile strength of the membrane increased with an increased amount of alumina up to 15 wt%. The thermal shrinkage of the membrane decreased with an increased amount of alumina up to 15 wt%. The electrochemical stability of the irradiated membrane after extraction was improved with irradiation dose up to 50 kGy.

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Effects of nucleating agents and extractants on the structure of polypropylene microporous membranes via thermally induced phase separation

Cited by 39 publications

References 5 publications

Phase equilibrium of a semicrystalline polymer-liquid system: Isotactic polypropylene-dibutylphthalate

Phase equilibrium of a semicrystalline polymer-liquid system: Isotactic polypropylene-dibutylphthalate

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

High Density Polyethylene Membrane Filled with Alumina Prepared by a Gamma Ray Irradiation

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