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What are the key differences between crystalline and amorphous polymers?
Crystalline polymers have a highly ordered molecular structure with repeating patterns, while amorphous polymers have a random molecular arrangement without distinct patterns. Crystalline polymers tend to be more rigid and have higher melting points, while amorphous polymers are more flexible and have lower melting points.
Do metalloids always have high melting temperatures?
No, metalloids do not always have high melting temperatures. While some metalloids like boron and silicon have relatively high melting temperatures, others like arsenic and antimony have lower melting temperatures. The melting temperature of a metalloid depends on its specific atomic structure and bonding characteristics.
What is the difference between crystals and polymers?
Crystals are solid materials characterized by a highly ordered, repeating arrangement of atoms or molecules, resulting in distinct geometric shapes and sharp melting points. In contrast, polymers are composed of long chains of repeating molecular units (monomers) that can be arranged in a more random or amorphous structure, leading to varying physical properties and often broader melting ranges. While crystals exhibit rigidity and a defined structure, polymers can be flexible and have diverse mechanical characteristics depending on their composition and arrangement.
How do you prepare polymer blend?
By dissolving 2 polymers, mixing the solution, adding a surfactant and evaporating the solvent. Alternatively you can heat the polymers above the melting point and mix them
What is the difference between melt spinning and dry spinning?
Melt spinning is used for polymers that can be melted i.e. the polymers must have a melting temperature (thermoplastic polymers). Dry spinning is used for polymers that do no have melting temperature and need to be dissolved in solvent (thermoset polymers). In case of melt spinning, the polymer solidifies by cooling after being extruded from the spinneret. Whereas, in case of dry spinning, the polymer solidifies through evaporation of solvents and this is achieved by a stream of air or inert gas.
How is beryllium sililar to lithium?
Beryllium and lithium are both alkali metals with similar characteristics. They are both light metals with low density, have a relatively low melting point, and are highly reactive. However, beryllium is denser and has a higher melting point compared to lithium.
Which type of compound would have the lowest melting point?
Compounds bonded by covalent bonds do not necessarily have low melting points. Some have whereas some don't have.Some polymers and hydrocarbons have very high melting points. But it can be said that they don't have melting points as high as ionic compounds. It is so because ionic bonds are stronger than the covalent bonds.
Does tin have a high or low melting point?
Tin has a relatively low melting point, at 231.93oC, or 449.47oF.
What is the melting point of Kevlar?
Kevlar does not have a melting point, as its polymers disintegrate before they could ever reach such a point.
Which of the following is true about the melting point of potassium chloride?
The melting point of potassium chloride is relatively high, around 776 degrees Celsius. At this temperature, potassium chloride transitions from a solid to a liquid state.
Naphthalene has high or low melting point?
Naphthalene has a relatively low melting point of around 80 degrees Celsius.
Characteristics of a molecular substance?
low melting point
