properties of polymers, difference of chain growth and step growth and examples of polymers, polymerization - polyethylene terephthalate
Editor's note: other exam questions are: Polymer and polymer, acid/alkali reaction, oxidation-reduction reaction, Environmental Chemistry (Ozone consumption)
, Molecular/salt/metal/atomic lattice, equilibrium equation and organic chemistry]
Plastic is the daily material that we will encounter in almost every daily situation.
But what does plastic do?
The advantages of polymerization the era of plastic materials has many advantages because it can be easily adjusted (
Different from metal, for example).
The plastic material can change the color without difficulty and has considerable elasticity, so it can be used in several fields, and the hardness can be changed (
It can be easily modified by heating materials, etc).
The production of this material is quite cheap and the polymer can be combined together.
This leads to many accessible properties.
The disadvantage of these plastic materials is that they cannot be degraded and in the worst case they cannot be recycled again.
This leads to waste products that are difficult to remove.
Another drawback of using plastic materials is that they come from crude oil, which can one day be a problem due to our limited crude oil resources.
The reaction at the beginning of the step growth polymerization reaction was very slow, and most of the monomer was lost early in the reaction.
Compared with chain growth, the obtained Moore mass is quite low (
There is no need for an initiator, because chain growth starts spontaneously in the presence of a large number of monomer (
Chain is active).
The chain growth polymerization reaction starts quickly at the beginning and reaches high quality at the end of the reaction (
In order to start such a reaction, an initiator is required (There are many (at best 7)
For example, valence electrons like iodine).
There are amorphous features and properties of thermoplastic plastics (undefined)
Due to the weak intermolecular force between the amorphous parts, they melt faster and the thermoplastic material is easy to form.
After cooling, the parts become more clear again.
By continuing the heating process, the Crystal part can also be melted, and the thermoplastic can be formed more easily.
The properties and properties of thermosolid plastics thermosolid polymers show very high resistance to temperature and mechanical properties.
They can only change their shape by drilling holes and handling them with other mechanical equipment.
The properties and performance of the elastic return tube can be easily stretched and can be restored to its original state without difficulty.
This is because their bonds have very few net points associated with each other.
This also means that they have weak resistance to temperature and weak mechanical consistency.
Polyethylene has poor resistance to temperature and poor mechanical consistency.
This is due to its weak inter-molecular force, which is just a weak induced electrode-dipole force. Properties of (PVC)
Polyethylene chloride plastic has better temperature resistance and better mechanical consistency.
This is mainly due to its strong induction electrode-dipole forces.
Unlike polyethylene, PVC is a larger molecule, thus inducing the strength of the electrodes
The electricity is increasing. Properties of (PET)
Polyethylene, which is known as PET, has poor temperature resistance, but on the other hand, its mechanical consistency is also very good.
Performance of nylon (
Because of its construction-up (
It has a strong inter-molecular force (dipole-dipole forces)
It not only has the ability to produce hydrogen bonds, but it is also a very polar molecule.
Polar molecules related to polymerization acid/alkali reaction, oxidation-reduction reaction, Environmental Chemistry (Ozone consumption)
Molecular/salt/metal/atomic lattice (
How to separate them in the lab)