What is meant by cationic polymerization?
In chemistry, cationic polymerization is a type of chain growth polymerization in which a cationic initiator transfers charge to a monomer which then becomes reactive. This reactive monomer goes on to react similarly with other monomers to form a polymer.
What is cationic polymer used for?
Cationic polymers are used to prepare bioactive coatings that kill bacteria upon contact without the release of any chemicals from the cationic molecules themselves.
What is cationic and anionic polymer?
Cationic polymerization reactions are sensitive to temperature. Both the reaction rate and molecular weight rapidly decrease with increasing temperature. Anionic polymerization reactions typically yield more regular polymers with less branching, more controlled tacticity and narrow molecular weight (MW) distribution.
What is cationic mechanism?
Mechanism of Cationic Polymerization Cationic polymerization is a type of chain growth polymerization in which a cationic initiator transfers a charge to a vinyl monomer which then becomes reactive. This reactive monomer goes on to react with other monomers to form a polymer.
What is cationic state?
Cationic. A cationic material has a net positive charge. Positive ions such as the sodium ion are cationic. A polyelectrolyte is called cationic if its chain has a positive charge after dissociation of monomeric counter-ions such as chloride or acetate.
What is the difference between cationic and anionic polyelectrolyte?
The key difference between cationic and anionic polyelectrolyte is that cationic polyelectrolytes can dissociate in aqueous solutions to form positively charged polymeric species, whereas anionic polyelectrolytes can dissociate in aqueous solutions to give negatively charged polymeric species.
What is a cationic charge?
What are examples of cations?
Examples of cations include the following:
- Calcium: Ca. 2+
- Silver: Ag. +
- Aluminum: Al. 3+
- Hydronium ion: H3O. +
- Ammonium: ion NH. 4+
- Mercurous ion: Hg. 2+2
- Ferrous Ion: Fe. +2
- Ferric Ion: Fe. +3
What type of alkenes prefer under cationic polymerization?
q Cationic polymerization of simple alkenes is especially efficient for alkenes which form relatively stable carbocations (note the tertiary carbocation intermediate) and which have one double bond terminus of the alkene unsubstituted, so as to minimize steric effects in the TS for the addition reaction.
What is the difference between cationic and anionic?
Cations are positively-charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons). Anions are negatively-charged ions (meaning they have more electrons than protons due to having gained one or more electrons).