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Why some polymer are highly crystalline and some are highly amorphous?
Wiki User
∙ 7y ago
This depends on:
- intermoleclar forces
- structure
- technology of preparation
Wiki User
∙ 7y ago
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Are amorphous and crystalline the same?
Amorphous solids are non-crystalline solids that lack the long-range order of crystal structures. Even amorphous solids have some short-range order.
What are the differences between crystalline and amorphous compounds or elements?
Elements themselves are not crystalline or amorphous. Instead this describes the structure of certain elements and compounds in the solid state. For instance, a single element can be found in both a crystalline form as well as an amorphous form. A crystalline solid is one in which there is a regular repeating pattern in the structure, or in other words, there is long-range order. In fact, you can completely describe the entire crystal by describing the single "repeat unit." For instance, as a simple example, if I have the pattern ABCABCABCABCABC... (that repeats infinitely) I can completely describe it by just saying it is "ABC" over and over again. In a 3-dimensional crystal, this repeat unit is called the "unit cell." Some crystalline solids are diamond, table salt, and many types of minerals found in the earth. An amorphous solid is one which does not have long-range order. In other words, there is no repeat unit. To contrast the example above, it would now be: ABCBCABBCACBACBAC... where there is no way to figure out what will be the next letter. Some examples of amorphous solids are glass (in windows, for example), wax, and plastics. If a liquid cools very quickly, the molecules will not have time to arrange themselves in the most favorable pattern (which will almost always be crystalline), and so they are locked into a disordered solid. Silicon is a common solid that can be found in both amorphous and crystalline forms, depending on how it is manufactured. Crystalline silicon is much harder to grow, but it is what is used in computer chips. Amorphous silicon is much cheaper and easier to grow, and is commonly used in solar panels.
Can amorphous solids convert into crystals and crystals convert into amorphous solids?
Yes, but it usually requires changes in temperature and/or pressure, although there are cases where one structure is energetically preferred where it can happen spontaneously. Some examples are:amorphous carbon under very high temperature and pressure becomes diamondthe black amorphous solid form of sulfur spontaneously converts to the yellow crystalline solid form slowly over time, as the crystal is more stableetc.
Which of these is a crystalline solid?
A "crystalline solid" is a solid characterized by a regular, ordered arrangement of particles. Unlike amorphous solids that melt at a range of temperatures, crystalline solids have definite melting points. Crystalline solids include metallic, ionic, network atomic and molecular solids. Unfortunately the way the question is worded implies that we are to select from a list - but no list is given. Some examples of crystalline solids are: Sodium Chloride (NaCl) Diamond (tetrahedrally arranged pure carbon) Quartz (SiO2) - note: (SiO2) can also be found as an amorphous solid in glass. Galena (PbS) Pyrite (FeS2) Ice (H2O) Bronze (Cu Sn alloy) Brass (Cu Zn alloy) Steel (Fe C alloy) ... also - pure elements tend to form crystals when in solid form.
Is polyethelene flammable?
Polyethylene is a polymer which is combustible. All polymers are so.
Are amorphous and crystalline the same?
Amorphous solids are non-crystalline solids that lack the long-range order of crystal structures. Even amorphous solids have some short-range order.
What are the difference between a crystalline structure and an amorphous structure?
I do not know of any polymers that are 100 percent crystalline. This is because most of the polymers you can make or buy have different molecular weights. So unlike small molecules, there are some differences in sizes between polymers. These differences prevent the polymer from being able to pack perfectly. This is the main reason why crystalline polymers also have amorphous regions.
Is glass a form of plastic?
Glass is an amorphous (non-crystalline) material composed mostly of silicon dioxide. Plastic is a broad term for thousands of different polymers, which are manmade hydrocarbons. Some are crystalline, and some are not.
What are the differences between crystalline and amorphous compounds or elements?
Elements themselves are not crystalline or amorphous. Instead this describes the structure of certain elements and compounds in the solid state. For instance, a single element can be found in both a crystalline form as well as an amorphous form. A crystalline solid is one in which there is a regular repeating pattern in the structure, or in other words, there is long-range order. In fact, you can completely describe the entire crystal by describing the single "repeat unit." For instance, as a simple example, if I have the pattern ABCABCABCABCABC... (that repeats infinitely) I can completely describe it by just saying it is "ABC" over and over again. In a 3-dimensional crystal, this repeat unit is called the "unit cell." Some crystalline solids are diamond, table salt, and many types of minerals found in the earth. An amorphous solid is one which does not have long-range order. In other words, there is no repeat unit. To contrast the example above, it would now be: ABCBCABBCACBACBAC... where there is no way to figure out what will be the next letter. Some examples of amorphous solids are glass (in windows, for example), wax, and plastics. If a liquid cools very quickly, the molecules will not have time to arrange themselves in the most favorable pattern (which will almost always be crystalline), and so they are locked into a disordered solid. Silicon is a common solid that can be found in both amorphous and crystalline forms, depending on how it is manufactured. Crystalline silicon is much harder to grow, but it is what is used in computer chips. Amorphous silicon is much cheaper and easier to grow, and is commonly used in solar panels.
What is an example of an amorphous solid?
some examples are wax, paraffin, polystyrene, etc. in case u didnt know, an amorphous solid is one that has particles not arranged in a particular order, or has non chrystalline characteristics. There are more everyday examples like glass, rubber, and basic plastics, if any of that helps. Dont forget wood.
Why some of the glass objects recovered from ancient monuments look milky instead of being transparent?
Amorphous solids can be converted into crystalline solids by alternate heating and cooling. Glass objects of ancient monuments, over the years, due to exposure to sunlight and being cooled at night becomes partly crystalline giving it a milky appearance.
Can amorphous solids convert into crystals and crystals convert into amorphous solids?
Yes, but it usually requires changes in temperature and/or pressure, although there are cases where one structure is energetically preferred where it can happen spontaneously. Some examples are:amorphous carbon under very high temperature and pressure becomes diamondthe black amorphous solid form of sulfur spontaneously converts to the yellow crystalline solid form slowly over time, as the crystal is more stableetc.
Is glass a polymer material?
In polymer science, the word glass is a term for a particular state of matter having certain characteristic properties. To avoid confusion, we'll ignore that and assume you're asking about ordinary window glass. Technically, it could be considered an extremely highly crosslinked polymer, and it does share some properties with polymers, but it's not normally thought of as a polymer.
Which of these is a crystalline solid?
A "crystalline solid" is a solid characterized by a regular, ordered arrangement of particles. Unlike amorphous solids that melt at a range of temperatures, crystalline solids have definite melting points. Crystalline solids include metallic, ionic, network atomic and molecular solids. Unfortunately the way the question is worded implies that we are to select from a list - but no list is given. Some examples of crystalline solids are: Sodium Chloride (NaCl) Diamond (tetrahedrally arranged pure carbon) Quartz (SiO2) - note: (SiO2) can also be found as an amorphous solid in glass. Galena (PbS) Pyrite (FeS2) Ice (H2O) Bronze (Cu Sn alloy) Brass (Cu Zn alloy) Steel (Fe C alloy) ... also - pure elements tend to form crystals when in solid form.
Amorphous compound obtained from some plants?
Resin
What are some examples of amorphous solid?
glass, plastic, wax
Is polyethelene flammable?
Polyethylene is a polymer which is combustible. All polymers are so.
