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Osmosis is a process where solvent molecules move toward a solution through a semipermeable membrane. As the solution dilutes due to the entry of solvent, it expands. This expansion increases the hydrostatic pressure of the solution. When the hydrostatic pressure equals the osmotic pressure, osmosis stops.Osmotic pressure, denoted by Π, is the minimum pressure needed to prevent the solvent from passing into the solution by osmosis. The van 't Hoff equation calculates the osmotic pressure...
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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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How does low-molecular-weight polystyrene dissolve: osmotic swelling vs. surface dissolution.

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This study reveals two simultaneous processes in polystyrene-toluene interactions: solvent diffusion into the polymer and polymer chain solvation and movement into the solvent. These mechanisms drive swelling and chain dilution below the glass transition temperature.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Understanding polymer-solvent interactions is crucial for material processing and performance.
  • Low-molecular-weight polystyrene (PS) behavior below its glass transition temperature (Tg) is complex.
  • Solvent-induced phenomena in polymers can lead to significant morphological and dynamic changes.

Purpose of the Study:

  • To investigate the real-time evolution of low-molecular-weight polystyrene in contact with toluene.
  • To elucidate the mechanisms of solvent diffusion and polymer chain dynamics.
  • To analyze the interplay between polymer swelling and chain mobility.

Main Methods:

  • Multiscale hierarchical modeling was employed to simulate polymer-solvent interactions.
  • The simulations focused on polystyrene below its glass transition temperature.
  • Analysis of solvent diffusion (Case II mechanism) and polymer chain solvation was performed.

Main Results:

  • Two concurrent phenomena were observed: an inside-out mechanism (solvent diffusion and swelling) and an outside-in mechanism (polymer solvation and movement).
  • A thin, instantaneously forming swollen layer facilitates the outside-in mechanism shortly after initial contact.
  • Solvent presence significantly enhances surface polymer chain mobility, particularly parallel to the interface.

Conclusions:

  • Below the entanglement length, a rapid formation of a swollen layer enables early onset of the outside-in mechanism.
  • Both inside-out and outside-in mechanisms operate concurrently after an initial transient phase.
  • Solvent-enhanced polymer chain mobility is directional, favoring movement parallel to the interface.