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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.
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.
How is the degree of crystallinity measured with by x-ray diffraction and differential scanning calorimetry?
The degree of crystallinity can be measured using X-ray diffraction (XRD) by analyzing the intensity and position of diffraction peaks; a higher intensity indicates greater crystallinity. In differential scanning calorimetry (DSC), crystallinity is inferred from the melting temperature and the enthalpy of fusion; the presence of sharp melting peaks and higher enthalpy values suggests a higher degree of crystallinity. Combining both techniques provides a comprehensive understanding of a material's crystalline structure.
How do you calculate crystallinity by XRD?
Crystallinity can be calculated by X-ray diffraction (XRD) by analyzing the intensity of the diffraction peaks in the XRD pattern. The degree of crystallinity is typically determined by comparing the area under the crystalline peaks to the total area under both crystalline and amorphous peaks. A common method involves using the formula: Degree of Crystallinity (%) = (Area of Crystalline Peaks / (Area of Crystalline Peaks + Area of Amorphous Peaks)) × 100. This provides a quantitative measure of the crystalline content in a sample.
What is the crystallinity of polypropllyne fiber?
The crystallinity of polypropylene fiber typically ranges from 50% to 70%. This high degree of crystallinity contributes to its strength, durability, and resistance to chemicals and moisture. The crystalline regions provide structural integrity, while the amorphous regions allow for flexibility and comfort in applications like textiles. Overall, the balance of crystallinity in polypropylene fibers plays a crucial role in determining their physical properties and performance.
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.
How is density influenced by crystallinity?
higher crystallinity in a polymer = lower density
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.
Is pet crystalline?
Yes, PET (polyethylene terephthalate) can exhibit crystalline properties. It is a semi-crystalline polymer, meaning it has both amorphous and crystalline regions within its structure. The degree of crystallinity can affect its mechanical properties, thermal stability, and clarity. When processed under certain conditions, PET can form a more crystalline structure, enhancing its strength and durability.
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.
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.
