Polymerization is a chemical reaction and term which applied to create even longer chains of high-temperature polyurethane overall. There are certain reactions and environments which are set up to make sure that the reactions are performed easily. The main aspect of all such reactions is same. The monomer molecules are included to make large chains or blocks of polymers. A polymer includes functional groups which are highly complex in nature. It simply means that polymerization is not a simple process at all. There are highly stable reactions and the resultant solvents which are included in it. Having regard to the above we review two main types of polymerization reactions which are performed to create large chans.
- Step growth reactions
- Chain growth reactions
- These two will be described in detail and the complete mechanism which forms the base of both will also be explained.
Step growth reactions
It is the most complex reaction of all. It is because the output which is formed in this reaction is long one and therefore multiple chains are created overall. Most of the chains which are produced as a result of this reaction are the ones which are used naturally. The molecular weight is also something which is considered in this regard. However, the chain reaction which takes place in this regard is highly complex as well. This high level of reaction also comes with overall speedy results and the chains are formed quickly. Within a single environment, more than one reaction can take place. It allows the production of more than one chain which means that the end product is the number is high as compared to normal reactions. Let us examine the important points which are considered before kicking off the step growth reaction.
- Complete molecular growth is recorded at the start of reaction
- The monomer molecule loses its identity very early in the reaction
- The steps which are included in this process are highly repetitive
Chain growth reactions
It is one of the best and easy reactions which are done to create polymers in a very easy and straightforward manner. It can be regarded as a combination of chain and block reaction. The simple aspect which is followed in this regard is the fact that a chain reaction is performed. While the reaction continues the active side of the chain receives a monomer one at a time. The best thing which is to be considered in this regard is the fact that the process is very time-consuming. As only one molecule is added a continuous monitoring of the environment is required. On the other hand, there is a highly reactive core of the process which is to be maintained as well. There are certain points in chain growth reaction forming high-temperature polymers. Let us give a good look at these main points.
- The active and the backend of the chain receives one molecule at a time
- Monomer reaction time is higher as compared to step growth reactions
- The termination occurs as soon as the process is completed
- For initiation, a compound is required to kick start the process.