Preparation method of interpenetrating network polymer

Generally, the second monomer, together with the cross-linking agent and initiator (or activator), are swelled into the already cross-linked polymer I, and the second monomer is polymerized in situ and cross-linked to form polymer II, so that the latter It is interspersed in the polymer I network. In addition, there are interspersed polymers obtained by the following different preparation methods.
The interpenetrating elastomer network is made by mixing two kinds of rubber emulsions to form a film, and then cross-linking them respectively. The English abbreviation IEN is IEN.
The latex interpenetrating network polymer uses the cross-linked polymer I latex as the seed latex, and monomer II and its cross-linking agent are added, and no new emulsifier is added, so that the monomer II is polymerized in the polymer I latex. Cross-linked.
Simultaneous polymerization and interpenetrating network 　In the same container, two independent, non-interfering polymerization and crosslinking reactions are carried out at the same time to form an interpenetrating network, the English abbreviation SIN. It is divided into two categories:
① It is formed by mixing two monomers, one of which undergoes polycondensation reaction and the other undergoes addition polymerization reaction.
②Two kinds of linear prepolymers are mixed together with their respective crosslinking agents and catalysts and then molded and solidified.
Gradual interpenetrating network polymer 　Using non-equilibrium swelling polymerization, that is, let the second monomer to cross-linked polymer I
Swelling, when the swelling equilibrium has not been reached, the monomer is polymerized and crosslinked, and the composition of the IPN formed in this way is gradually gradual, hence the name.
Interspersing macrocycles 　The molecules of the linear polymer are interspersed in the ring of the organic compound molecule with a macrocyclic structure, and then the linear polymer is cross-linked to form a network (Figure 2).
Semi-penetrating network 　In the network composed of two polymers, one polymer is an uncross-linked linear molecule, which is interspersed in another polymer that has been cross-linked, and is called a semi-penetrating network. Among them, cross-linked polymer I/linear polymer II is called semi-I; linear polymer I/cross-linked polymer II is called semi-II.
AB type cross-linked polymer is a kind of network formed by cross-linking or "stitching" polymer II to polymer I or its network (Figure 3). Strictly speaking, this type of polymer is beyond the scope of IPN.