A crosslinked polymer has all the macromolecular chains joined together through covalent bonds. For this reason you can not calculate the molecular mass (MM) of this polymer because any piece of polymer you have in your hands can be considered a molecule. For example if you have one piece of completely crosslinked polymer of 20 grams to calculate the MM you have to divide 20 grams by the real weight of the unity of MM. This real weight is around 1/Avogadro’s Number grams (1/6.023x10^23 = 1.66x10^-24 grams). 20/ 1.66x10^-24 = 1,2x10^25. Is a very big number. If you have a peace of polymer that weigh 200 g the MM will be ten time the previous value: 1.2x1026, etc.. These number are too big and it makes no sense because they vary in function of the weight of piece of polymer. Conventionally we tell that a completely crosslinked polymer has infinite molecular mass.
All the other type of polymer (linear, branched, big circular structures, etc) are considered uncrossed polymers.
A crosslinked polymer has all the macromolecular chains joined together through covalent bonds. For this reason you can not calculate the molecular mass (MM) of this polymer because any piece of polymer you have in your hands can be considered a molecule. For example if you have one piece of completely crosslinked polymer of 20 grams to calculate the MM you have to divide 20 grams by the real weight of the unity of MM. This real weight is around 1/Avogadro’s Number grams (1/6.023x10^23 = 1.66x10^-24 grams). 20/ 1.66x10^-24 = 1,2x10^25. Is a very big number. If you have a peace of polymer that weigh 200 g the MM will be ten time the previous value: 1.2x1026, etc.. These number are too big and it makes no sense because they vary in function of the weight of piece of polymer. Conventionally we tell that a completely crosslinked polymer has infinite molecular mass.
All the other type of polymer (linear, branched, big circular structures, etc) are considered uncrossed polymers.
Its done all the time. For example you heard of ABS plastic, for football helmets and such. It is Acryonitrile (first polymer) Butadiene (second polymer, an elastomer) Styrene (third polymer, cheap model airplane plastic). ABS is a favorite for 3d printers. There are other examples. Then you have a class of polymers called copolymers where two or more polymers are bonded together and they do so at various percentages. This would not happen if they were immiscible. If they were immiscible, then you can still combine them as a composite. Your shirt is a combination of polyester and cotton making it a composite. Another example is Kevlar fiber reinforced epoxy to make bullet proof walls.
Yes, some combinations do not mix, but then your meaning of combined is vague.
Its done all the time. For example you heard of ABS plastic, for football helmets and such. It is Acryonitrile (first polymer) Butadiene (second polymer, an elastomer) Styrene (third polymer, cheap model airplane plastic). ABS is a favorite for 3d printers. There are other examples. Then you have a class of polymers called copolymers where two or more polymers are bonded together and they do so at various percentages. This would not happen if they were immiscible. If they were immiscible, then you can still combine them as a composite. Your shirt is a combination of polyester and cotton making it a composite. Another example is Kevlar fiber reinforced epoxy to make bullet proof walls.
Yes, some combinations do not mix, but then your meaning of combined is vague.
A crosslinked polymer has all the macromolecular chains joined together through covalent bonds. For this reason you can not calculate the molecular mass (MM) of this polymer because any piece of polymer you have in your hands can be considered a molecule. For example if you have one piece of completely crosslinked polymer of 20 grams to calculate the MM you have to divide 20 grams by the real weight of the unity of MM. This real weight is around 1/Avogadro’s Number grams (1/6.023x10^23 = 1.66x10^-24 grams). 20/ 1.66x10^-24 = 1,2x10^25. Is a very big number. If you have a peace of polymer that weigh 200 g the MM will be ten time the previous value: 1.2x1026, etc.. These number are too big and it makes no sense because they vary in function of the weight of piece of polymer. Conventionally we tell that a completely crosslinked polymer has infinite molecular mass.
All the other type of polymer (linear, branched, big circular structures, etc) are considered uncrossed polymers.
A crosslinked polymer has all the macromolecular chains joined together through covalent bonds. For this reason you can not calculate the molecular mass (MM) of this polymer because any piece of polymer you have in your hands can be considered a molecule. For example if you have one piece of completely crosslinked polymer of 20 grams to calculate the MM you have to divide 20 grams by the real weight of the unity of MM. This real weight is around 1/Avogadro’s Number grams (1/6.023x10^23 = 1.66x10^-24 grams). 20/ 1.66x10^-24 = 1,2x10^25. Is a very big number. If you have a peace of polymer that weigh 200 g the MM will be ten time the previous value: 1.2x1026, etc.. These number are too big and it makes no sense because they vary in function of the weight of piece of polymer. Conventionally we tell that a completely crosslinked polymer has infinite molecular mass.
All the other type of polymer (linear, branched, big circular structures, etc) are considered uncrossed polymers.
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Its done all the time. For example you heard of ABS plastic, for football helmets and such. It is Acryonitrile (first polymer) Butadiene (second polymer, an elastomer) Styrene (third polymer, cheap model airplane plastic). ABS is a favorite for 3d printers. There are other examples. Then you have a class of polymers called copolymers where two or more polymers are bonded together and they do so at various percentages. This would not happen if they were immiscible. If they were immiscible, then you can still combine them as a composite. Your shirt is a combination of polyester and cotton making it a composite. Another example is Kevlar fiber reinforced epoxy to make bullet proof walls.
Yes, some combinations do not mix, but then your meaning of combined is vague.
Its done all the time. For example you heard of ABS plastic, for football helmets and such. It is Acryonitrile (first polymer) Butadiene (second polymer, an elastomer) Styrene (third polymer, cheap model airplane plastic). ABS is a favorite for 3d printers. There are other examples. Then you have a class of polymers called copolymers where two or more polymers are bonded together and they do so at various percentages. This would not happen if they were immiscible. If they were immiscible, then you can still combine them as a composite. Your shirt is a combination of polyester and cotton making it a composite. Another example is Kevlar fiber reinforced epoxy to make bullet proof walls.
Yes, some combinations do not mix, but then your meaning of combined is vague.
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