What is the difference between polyaddition and polycondensation

The polycondensation reaction is characterized by:

1) The monomer does not necessarily contain unsaturated bonds, but must contain two or more reactive groups (such as -OH, -COOH, -NH2, -X, etc.).

2) As a result of the polycondensation reaction, not only polymers are formed, but also by-products (small molecules) are formed.

3) The chemical composition of the obtained polymer compound is different from that of the monomer.

From the above, it can be seen that the monomer structure, reaction mechanism, and chemical composition of the products of the polyaddition reaction and the polycondensation reaction are completely different.

The polyaddition reaction is characterized by:

1) The monomer must be a compound containing unsaturated bonds such as double bonds. For example, vinyl chloride, acrylonitrile and other substances containing unsaturated bonds can undergo polyaddition reaction under certain conditions.

2) The polyaddition reaction occurs on the unsaturated bonds.

3) In the process of polymerization, no by-products are produced, and the chemical composition of the polymer is the same as that of the monomer.

Addition reaction refers to the addition polymerization reaction. Meaning that the monomer synthesizes the polymer by addition reaction. No by-products are produced in this reaction, while all reactants are utilized. Examples of polymers resulting from polyaddition reactions include polyethylene, polyvinyl chloride, polyurethane, Teflon, and many more.

The polycondensation reaction is a condensation polymerization reaction. This means that the monomers are condensed to form polymers. Small molecular by-products such as water, hydrogen halide, ammonia, etc. are produced during the reaction. Examples of polymers produced by polycondensation reactions include nylon, phenolic resins, polyesters, peptides, polysaccharides, and many more.

This is explained in more detail on the encyclopedia.

Polyaddition reaction refers to the reaction of the same substance to react with each other to form polymer compounds, such as olefins, alkynes, etc. Polycondensation reaction refers to the reaction of two different substances that react with each other to form polymer compounds, such as acids and alcohols, amino acids, etc.

In the case of polyaddition, the product is reflected in the chemical equation as a product. In the case of polycondensation reaction, the product is generally formed by H2O.

Olefins cannot be polycondensed and can be polycondensed.

Generally, those containing CC double bonds and triple bonds can be polymerized.

I think so in high school.

Containing carbon-carbon double bonds and carbon-carbon triple bonds can be polymerized.

Those containing both -COOH and -OH, or containing both -COOH and -NH2 can be polycondensed, and polycondensation should be opened and small molecules should be decondensed.

The polyaddition reaction produces only one polymer, whereas the polycondensation reaction produces a variety of substances.

They are all polymerization reactions, and the common point is that they all have polymer products with foot mark N, the difference is that polyaddition only has polymer products, which are completed by addition, such as olefins and alkynes. Polycondensation is also accompanied by the production of small molecule products, which are usually done by substitution, such as amino acids to proteins, diols and diacids to polyesters.

Polycondensation reaction refers to the reaction in which one or more monomers are condensed with each other to form polymers, and its main product is called condensation polymer.

The polycondensation reaction is characterized by:

Most of them are reversible and stepwise reactions, and the molecular weight gradually increases with the extension of reaction time, but the conversion rate of monomers is almost independent of time. According to the reaction conditions, it can be divided into four types: melt polycondensation reaction, solution polycondensation reaction, interface polycondensation reaction and solid-phase polycondensation reaction. According to the raw materials used, it can be divided into three types: homogeneous polycondensation reaction, mixed polycondensation reaction and co-polycondensation reaction; According to the product structure, it can be divided into two types: two-way polycondensation or linear polycondensation reaction and three-way polycondensation or bulk polycondensation reaction.

The addition reaction is the addition polymerization reaction, which is the reaction of the polymerization of the alkene monorub by addition. There are no by-products in the polyaddition reaction. Monomers react with each other to form a polymer compound called polyaddition.

In addition, the reaction between monomers to form polymer compounds and small molecules (water, ammonia and other molecules) is called polycondensation reaction. Polyaddition reaction: the reaction in which small molecule olefins or substituted derivatives of olefins are combined into polymer compounds through addition reaction under the action of heating and catalyst, which is called addition polymerization reaction.

The polyaddition reaction is an addition polymerization reaction, which is generally a reaction in which compounds containing unsaturated bonds are added to each other to form new covalent bonds linked to macromolecules. For example, ethylene has unsaturated double bonds, and there are many ethylene that open this double bond and add to each other to form a large molecular polyethylene.

Polycondensation is a chemical reaction in which monomers with two or more functional groups react with each other to form polymer compounds, and at the same time produce chemical reactions with simple molecules (such as H2O, Hx, alcohol, etc.). For example, adipic acid and ethylene glycol, the carboxyl group at one end of the adipic acid is connected to the hydroxyl group at the other end of the ethylene glycol, and the hydroxyl group at the other end of the ethylene glycol is connected to the carboxyl group of the next adipic acid, and so on, can be condensed into a large molecule polyethylene glycoate.

Polyaddition and polycondensation are collectively referred to as polymerization.

1. The characteristics of the corresponding substances are different: the polycondensation reaction contains characteristic functional groups, such as amino groups, and the polyaddition reaction contains unsaturated bonds;

2. The characteristics of the products are different: the composition of the polymer in the polycondensation reaction is different from that of the single molecule, and the polymer in the polyaddition reaction has the same composition as the single molecule;

3. The types of products are different: there are polymers and small molecules in the polycondensation reaction, while there are only polymers in the polymerization reaction;

4. The reaction conditions are not the same: the polycondensation reaction reacts under the conditions of alkalinity and excessive formaldehyde, and the polycondensation reaction reacts under the action of heating and catalyst.

Polymerization reaction: The reaction of small molecules to produce polymer compounds is called polymerization reaction.

There are two types of polymerization reactions: addition polymerization reactions and condensation polymerization reactions.

Addition reaction: that is, addition polymerization reaction, the reaction of alkene monomers polymerized by addition. There are no by-products in the polyaddition reaction, and the monomers react with each other to form a polymer compound, which is called the polyaddition reaction.

Polycondensation reaction is the process of dismantling the polymer by repeating the condensation reaction for many times, and has the dual meaning of condensing low molecules and polymerizing into high molecules, and the reaction products are called condensation polymers.

Polyaddition reactions, such as double and triple bonds, can open a bond and polymerize to form a long chain. It can also be similar to caprolactam, where a peptide bond formed by water has been removed from the inside to form a long chain, which is nylon 6.

In the polycondensation reaction, two molecules polycondensation removes a small molecule, such as amino acids to form a polypeptide chain, which is polycondensation in pairs, and a water molecule is removed at the same time. The combination of amino group and carboxyl group generally requires two functional groups on one molecule.

If you want to polycondensate, there must be more than two functional groups in a molecule, such as one is a hydroxyl group and the other is a carboxyl bridge, in order to condense to form a long chain of esters, amino and carboxyl groups can also be polycondensation (dehydration and condensation of EG amino acids), and if you add poly, you must have unsaturated bonds, such as double bonds and triple bonds, and carbon and oxygen double bonds can also be polyadded.

Classification of condensation polymerization reactions

Classified by the number of monomers.

1. Homogeneous polycondensation is the use of the same monomer for polycondensation to generate polymer compounds and low molecular by-products. For example, caprolactam polycondensation produces polycaprolactam and water.

2. Co-polycondensation is the use of several different monomers for polycondensation. For example, the polycondensation of hexamethylenediamine and adipic acid to form polyadipyl hexamethylenediamine and water.

Classification by reaction conditions.

1. Melt polycondensation: It is a polymerization reaction process in which both the raw material monomer and the generated polymer are in a molten state.

2. Solution polycondensation: refers to the method of polycondensation reaction of monomers in an inert solvent.

3. Interfacial polycondensation: It refers to the irreversible polycondensation reaction at the interface of the two liquid phases by dissolving two monomers with high reactive performance in two solvents that are not mutually sensitive. Caution.

4. Solid-phase polycondensation: refers to the polycondensation reaction of monomers or prepolymers under solid conditions.

Classified by product structure.

1. Linear polycondensation reaction: It is a polycondensation reaction in which a monomer with only two functional groups develops in two directions to form a linear polymer.

2. Body type polycondensation reaction: It is a polycondensation reaction in which a monomer with two or more functional groups develops in three directions to form a body type polymer.