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Viscosity of polymer emulsion is much lower than that of straight polymer in melt phase. Easier to process but also allows production of polymers that are extremely sticky as 100% polymer. Final product can easily be removed from reactor due to lower viscosity (and can be washed out with water).
Which of the following are considered as disadvantages of emulsion?
Disadvantages of emulsion polymerization include: Surfactants and other polymerization adjuvants remain in the polymer or are difficult to remove. For dry (isolated) polymers, water removal is an energy-intensive process.
What is emulsion in pharmacy?
Definition of Emulsion: An emulsion is a biphasic liquid dosage form. An emulsion is a mixture of two or more liquids that are normally immiscible to each other but using emulsifying agents one liquid is dispersed into other liquid as droplets.
What is emulsion and its uses?
Emulsions are commonly used in many major chemical industries. In the pharmaceutical industry, they are used to make medicines more palatable, to improve effectiveness by controlling dosage of active ingredients, and to provide improved aesthetics for topical drugs such as ointments.
What are the types of emulsion?
There are two basic types of emulsions: oil-in-water (O/W) and water-in-oil (W/O). These emulsions are exactly what they sound like, as pictured below. In every emulsion there is a continuous phase that suspends the droplets of the other element which is called the dispersed phase.
What is the advantages and disadvantages of emulsion polymerization technique?
Advantages and Disadvantages With emulsion polymerization, we can achieve a high molecular weight product very quickly–within 1-2 hours. Disadvantages include the fact emulsion polymerization yields a less pure end-product than the slower bulk polymerization.
How is emulsion type detected?
a) Microscopic methods: To a small amount of the given emulsion, a few drops of water are added. The water will mix completely if the emulsion is oil-in-water type. Similarly for the water-in-oil emulsions, the miscibility with a few drops of oil can be tested. The miscibility can be seen under a microscope.
Which among the following is an example of emulsion?
Milk is an emulsion of fat and water. An emulsion is a dispression of tiny droplets in another liquid. Thus it is a liquid-liquid colloidal system.
What are the types of emulsion in pharmacy?
There are two basic types of emulsions, that is, oil in water (O/W) and water in oil (W/O). In addition to these two types, a relatively complex emulsion, called multiple emulsions can also be formulated.
What are the four uses of emulsion?
Four uses of emulsions : Cleansing action of soap is based on the formation of emulsions. Digestion of fats in intestine takes place by the process of emulsification. Antiseptics and disinfectants when added to water form emulsions. The process of emulsification is used to make medicines. Was this answer helpful?.
How does an emulsion work?
An emulsion is a mixture of two or more liquids, with or without an emulsifier, that are normally immiscible. One of the liquids, the “dispersed phase,” forms droplets in the other liquid, the “continuous phase.” A suspension is a solid dispersed in a liquid. The particles are large enough for sedimentation.
What are the three types of emulsions?
There are three kinds of emulsions: temporary, semi-permanent, and permanent. An example of a temporary emulsion is a simple vinaigrette while mayonnaise is a permanent emulsion.
What are the 2 types of emulsion?
Emulsions easily fall into two categories: an oil-in-water (O/W) or water-in-oil (W/O) emulsion, depending on the continuous phase. The type of emulsion that forms depends largely on the volume ratio of the two materials, with the more abundant phase forming the continuous phase.
Is milk an example of emulsion?
A colloidal solution in which liquid particles are dispersed in a liquid medium is known as emulsion. Thus, in an emulsion, dispersed particles and the dispersion medium both are in liquid phase. Milk is an emulsion in which fat globules are suspended in water. Thus, milk is an emulsion.
Is blood an emulsion?
Is blood a emulsion? Another type of colloid is an emulsion, fats and some proteins dispersed in the liquid are colloid emulsions. Blood is also a complex solution where solids, liquids, and even gases are dissolved in the blood liquid called plasma.
Which is the limitation of emulsion polymerization?
A limitation of emulsion polymerization is that good results cannot be met if the monomer is too hydrophobic because diffusion into swollen micelles from monomer droplets is very slow for these kinds of monomers [41].
What are the properties of emulsion?
Properties of Emulsion (i) Emulsions show all the characteristic properties of colloidal solution such as Brownian movement, Tyndall effect, electrophoresis etc. (ii) These are coagulated by the addition of electrolytes containing polyvalent metal ions indicating the negative charge on the globules.
What is difference between emulsion and suspension?
Mixtures can be of many types like a solution, suspension and colloids. A mixture can be classified into two types, homogeneous mixture and heterogeneous mixture.Difference between Suspension and Emulsion. Suspension Emulsion Solid particles are dispersed in any medium, that can be solid, gas or liquid Both dispersed phase and the dispersion medium are liquid.
Which is not a method to test the type of emulsion?
6. Which of the following is not a method to test the type of emulsion? Explanation: Coagulation or precipitation is a process of aggregating together the colloidal particles to change them into large-sized particles which ultimately settle as a precipitate.
What are the different instability found in emulsion?
There are three types of instability in emulsions: (1) flocculation, (2) creaming, and (3) coalescence. Flocculation occurs when there is an attractive force between the droplets, so they form a flocculant mass (flocs) in the fluid through precipitation or aggregation of suspended particles.
Which one is not a type of emulsion?
An emulsion is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. Examples: Oil and water mixtures are emulsions when shaken together. The oil will form drops and disperse throughout the water. So, curd is not an emulsion.
What do you understand by emulsion?
Emulsion, in physical chemistry, mixture of two or more liquids in which one is present as droplets, of microscopic or ultramicroscopic size, distributed throughout the other. Unstable emulsions eventually separate into two liquid layers.
Which one of the following is the best way for preparing an emulsion?
Explanation: Adding soluble oil to the water is one of the best way for preparing an emulsion.
Which is a natural emulsion?
Cream and buttermilk are also natural emulsions. Butter is a special case because unlike most natural emulsions, which are oil-in-water emulsions, its continuous phase is fat (80% by volume) with water droplets dispersed throughout, making it a water-in-oil emulsion.
