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What are the factors that influence crystallinity?
In general it can be said that the most important factor affecting the crystallinity is the structure of the components used in polymer synthesis. If the polymer synthesized has a very symmetrical structure, then we can say that a highly crystalline material will form. The tacticity of the polymer is also important factor affecting the crystallinity. If the components are reacting in an ordered way, like syndiotactic PET, the material will be highly crystalline. But if the PET is atactic then it will be highly amorphous,even if the components of the polymer are the same.
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.
What disadvantages does crystallinity in a polymer offer?
Crystallinity in a polymer can lead to decreased flexibility and impact resistance. It may also make the material more prone to stress cracking. Additionally, the presence of crystalline regions can affect the transparency and processability of the polymer.
What is meant by crystallinity in polymers?
Crystals are type of solid state bodies whose structural order are well defined and have a unique lattice structures. There is a perfect distance between the various layers in its structure. Crystallinity has big influence on the hardness, density of the body. Non- Crystalline substances are the ones who lack the structural order and do not posses the well defined lattice structure. They tend to have lower density and low melting point as there atoms are scattered. Crystals have high tensile strength while the non crystals are not.
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.
How is density influenced by crystallinity?
higher crystallinity in a polymer = lower density
What are the factors that influence crystallinity?
In general it can be said that the most important factor affecting the crystallinity is the structure of the components used in polymer synthesis. If the polymer synthesized has a very symmetrical structure, then we can say that a highly crystalline material will form. The tacticity of the polymer is also important factor affecting the crystallinity. If the components are reacting in an ordered way, like syndiotactic PET, the material will be highly crystalline. But if the PET is atactic then it will be highly amorphous,even if the components of the polymer are the same.
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.
What disadvantages does crystallinity in a polymer offer?
Crystallinity in a polymer can lead to decreased flexibility and impact resistance. It may also make the material more prone to stress cracking. Additionally, the presence of crystalline regions can affect the transparency and processability of the polymer.
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
What is meant by crystallinity in polymers?
Crystals are type of solid state bodies whose structural order are well defined and have a unique lattice structures. There is a perfect distance between the various layers in its structure. Crystallinity has big influence on the hardness, density of the body. Non- Crystalline substances are the ones who lack the structural order and do not posses the well defined lattice structure. They tend to have lower density and low melting point as there atoms are scattered. Crystals have high tensile strength while the non crystals are not.
Why is this polymerization reaction known as addition polymerization?
In this type of polymerization monomers are added successive without any loss of molecule or atom.
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.
How does oil polymerization affect the properties of polymers?
Oil polymerization is a process where small molecules in oil combine to form larger molecules, resulting in the formation of polymers. This process can change the properties of polymers by increasing their strength, durability, and heat resistance. Additionally, oil polymerization can also improve the flexibility and chemical resistance of polymers, making them more suitable for various applications.
Which types of polymerization techniques are used to make polystyrene?
Atactic and syndiotactic polymerization.
Compute the degree of polymerization of polystyrene?
The degree of polymerization(n) is the ratio between Molecular weight(M) and the molar mass of the repeating unit in a polymer(m). M=n*m The molar mass(m) of the monomer (styrene) is 104.15 grams/mol if you are given a Molecular weight, just devide by m, and you've got it!
What synthesis puts two monomers together?
Polymerization is the synthesis process that joins two monomers together to form a polymer. This process can occur through various mechanisms, such as addition polymerization, condensation polymerization, or ring-opening polymerization.
