Morphologies of blends of isotactic polypropylene and ethylene copolymer by rapid expansion of supercritical solution and isobaric crystallization from supercritical solution

Han, Suh Joon; Lohse, David J.; Radosz, Maciej; Sperling, L. H.

doi:10.1002/1097-4628(20000815)77:7<1478::aid-app9>3.0.co;2-2

Cited by 11 publications

(4 citation statements)

References 26 publications

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“…Such a use of water-in-CO 2 microemulsions for nanoparticle preparation serves as an alternative to the in situ reaction method reported by Wai, Fulton, and co-workers 3,4 and Johnston and co-workers. , However, a significantly different feature of the method reported here is that the formation of nanoparticles is under ambient conditions outside the supercritical fluid chamber, which avoids the difficulty found in the in situ reaction method with respect to the collection of the as-prepared nanoparticles. In addition, supercritical fluid processing methods based on rapid expansion are popular in materials preparation and fabrication. − ,− Thework reported here provides a valuable example for the use of microemulsions in the rapid expansion based methods.…”

Section: Resultsmentioning

confidence: 99%

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Preparation of Silver Nanoparticles via Rapid Expansion of Water in Carbon Dioxide Microemulsion into Reductant Solution

2001

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Perfluoropolyether ammonium carboxylate stabilized water-in-CO2 microemulsion was used to dissolve silver nitrate salt for the RESOLV (Rapid Expansion of a Supercritical Solution into a Liquid SOLVent) process. The solution of reverse micelles with an aqueous silver nitrate core in CO2 was rapidly expanded into a room-temperature solution of sodium borohydride to form silver nanoparticles. The nanoparticles were characterized using optical, X-ray diffraction, and microscopy techniques. The nanoparticle properties were found to be dependent on the pre-expansion microemulsion conditions in CO2.

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Section: Resultsmentioning

confidence: 99%

“…In addition, supercritical fluid processing methods based on rapid expansion are popular in materials preparation and fabrication. [8][9][10][19][20][21][22][23] The work reported here provides a valuable example for the use of microemulsions in the rapid expansion based methods.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Silver Nanoparticles via Rapid Expansion of Water in Carbon Dioxide Microemulsion into Reductant Solution

2001

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“…The RESS process has been used to produce many types of polymer particles, fibers, and films. 5 In this study, the critical polymer concentrations of polyethylene solutions in pentane were experimentally determined by using a variable-volume view cell apparatus. The equipment was used to determine the phase separation boundary for a particular mixture under isothermal conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, knowledge of the critical polymer concentration could be applied and would be of great value in the pressure-induced particle formation technologies, such as the rapid expansion of supercritical solution (RESS) process. The RESS process has been used to produce many types of polymer particles, fibers, and films …”

Section: Introductionmentioning

confidence: 99%

Critical Polymer Concentrations of Polyethylene Solutions in Pentane

2002

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Critical polymer concentrations of polyethylene solutions in pentane were measured using a variablevolume view cell apparatus. The molecular weights of the polyethylene samples were 27 700 and 41 700 with polydispersity indexes M w /M n ) 2.00 and 3.70, respectively. The phase separation pressures (cloud point) of the polymer solutions were repeatedly measured in the polymer concentration range 0.3-11.0 mass %. Two types of phase separation patterns (dew-point and bubble-point types) were observed, depending on the polymer concentration. The critical polymer concentration was determined by locating a merging point of the two types of phase separation branches. The critical polymer concentrations for the two polyethylene solutions were 6.90 ( 0.1 (M w ) 27 700) and 3.95 ( 0.05 (M w ) 41 700) mass %, respectively.

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Interpenetrating Polymer Networks

Sperling

2004

Encyclopedia of Polymer Science and Technology

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An interpenetrating polymer network, IPN, is a combination of two polymers in network form, at least one of which is synthesized and/or cross‐linked in the immediate presence of the other (L. H. Sperling, Interpenetrating Polymer Networks and Related Materials, Plenum Press, New York, 1981). An IPN is distinguished from other multipolymer combinations, such as polymer blends, blocks, and grafts, in two ways: ( 1 ) an IPN swells, but does not dissolve in solvents; and ( 2 ) creep and flow are suppressed. This article discusses synthesis, morphology, glass transitions, and mechanical behavior of IPNs, and outlines known and proposed applications of these materials. Some applications of note include sound and vibration damping, biomedical applications, natural products and renewable resources, tough and impact‐resistant materials, etc.

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Morphologies of blends of isotactic polypropylene and ethylene copolymer by rapid expansion of supercritical solution and isobaric crystallization from supercritical solution

Cited by 11 publications

References 26 publications

Preparation of Silver Nanoparticles via Rapid Expansion of Water in Carbon Dioxide Microemulsion into Reductant Solution

Preparation of Silver Nanoparticles via Rapid Expansion of Water in Carbon Dioxide Microemulsion into Reductant Solution

Critical Polymer Concentrations of Polyethylene Solutions in Pentane

Interpenetrating Polymer Networks

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