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Number-average molecular weight of a polypropylene is 1000000 gmol Compute the number-average degree of polymerization?
Number-average degree of polymerization = (Number-average molecular weight of polymer) / (Molecular weight of repeating unit) For polypropylene, the molecular weight of the repeating unit is 42 g/mol. Thus, degree of polymerization = 1000000 g/mol / 42 g/mol = 23809.52.
How Degree of polymerization affect to the crystallinity?
A higher degree of polymerization generally leads to higher crystallinity in polymers. Longer polymer chains can pack together more closely in an organized manner, increasing the likelihood of crystalline regions forming. This results in a higher degree of ordered molecular structure, leading to increased crystallinity in the polymer.
Why does fish oil dissolve polystyrene?
Fish oil contains compounds called hydrocarbons, which are known to have a solvent effect on polystyrene. When fish oil comes in contact with polystyrene, the hydrocarbons can break down the bonds holding the polystyrene together, causing it to dissolve.
How is expanded polystyrene foam made before 1990?
Expanded polystyrene foam, also known as styrofoam, was typically made using a process that involved the polymerization of styrene monomer to form polystyrene beads. These beads were then expanded using a blowing agent like pentane to create the foam structure through steam heating. The foam was molded into different shapes for packaging and insulation purposes.
Which process bonds monomers into poylmers?
Polymerization is the process that bonds monomers together to form polymers. This can occur through various mechanisms like addition polymerization, condensation polymerization, and ring-opening polymerization.
What is polystyrene made?
Polystyrene is obtained by the polymerization of the monomer styrene.
Which types of polymerization techniques are used to make polystyrene?
Atactic and syndiotactic polymerization.
Number-average molecular weight of a polypropylene is 1000000 gmol Compute the number-average degree of polymerization?
Number-average degree of polymerization = (Number-average molecular weight of polymer) / (Molecular weight of repeating unit) For polypropylene, the molecular weight of the repeating unit is 42 g/mol. Thus, degree of polymerization = 1000000 g/mol / 42 g/mol = 23809.52.
Where is polystyrene from?
Polystyrene is a synthetic polymer derived from the monomer styrene, which is primarily obtained from petroleum or natural gas. The production process involves the polymerization of styrene molecules, resulting in polystyrene, which can be produced in various forms, including solid and foam. It is widely used in packaging, insulation, and disposable products due to its lightweight and insulating properties.
Does polystyrene exhibit yielding?
No, pure Polystyrene (PS) is quite brittle; hence, General Purpose Polystyrene (GPPS) does not yield. It breaks right after passing over its limit. However, the weakness of polystyrene, which is brittleness, is overcome when it is made into High Impact Polystyrene (HIPS). Having a higher breaking strain after polymerization, it is able to yield before breaking. Thus, from this tensile testing experiment, GPPS does not have yield strength, while HIPS has yield strength of 26.175N/mm2.
How Degree of polymerization affect to the crystallinity?
A higher degree of polymerization generally leads to higher crystallinity in polymers. Longer polymer chains can pack together more closely in an organized manner, increasing the likelihood of crystalline regions forming. This results in a higher degree of ordered molecular structure, leading to increased crystallinity in the polymer.
What can you do with polystyrene?
Polystyrene can be used in various industries like Polystyrene Packaging, Construction, Display, Exhibition, Signs, and all areas of the foam industry. Various different items can be produced from polystyrene. For a complete range and details about products please visit: http://www.polystyrene.uk.com/
Why does fish oil dissolve polystyrene?
Fish oil contains compounds called hydrocarbons, which are known to have a solvent effect on polystyrene. When fish oil comes in contact with polystyrene, the hydrocarbons can break down the bonds holding the polystyrene together, causing it to dissolve.
What material is used for polystryne?
Polystyrene is a synthetic polymer made from the monomer styrene, which is derived from petroleum. It is produced through the polymerization process, where styrene molecules are chemically bonded to form long chains. Polystyrene can be found in various forms, including solid and foam, and is commonly used in packaging, insulation, and disposable containers.
What are the most unusual chemical reactions in the world?
This question really doesn't have an answer. Unusual how? One that tends to surprise people is the polymerization of propylene. If you do a free radical polymerization of ethylene, you get polyethylene. If you do a free radical polymerization of styrene, you get polystyrene. But if you try the same thing on propylene, you don't get polypropylene, you get polyethylene. (Despite not being what you might expect at first glance, it's not a mistake or an accident; it does make perfect sense if you think about it carefully.)
How could you determine the degree of polymerization of amylose?
Well,, that's a good one!!! We can measure it spectrophotometrically by measuring the amount of inorganic phosphate released during the reaction. Also we can use Light scattering and Refractive Index analysis to measure the Degree of polymerization of Amylose!!! bhanu1_prakash@yahoo.co.in
How is expanded polystyrene foam made before 1990?
Expanded polystyrene foam, also known as styrofoam, was typically made using a process that involved the polymerization of styrene monomer to form polystyrene beads. These beads were then expanded using a blowing agent like pentane to create the foam structure through steam heating. The foam was molded into different shapes for packaging and insulation purposes.
