Method for producing polyamide by coordinated anionic ring-opening polymerization, and polyamide produced thereby
The present invention relates to a method for producing a polyamide by coordinated anionic ring-opening polymerization and a polyamide produced thereby, wherein metal alkoxide as an initiator and metal hydride as a catalyst are added to enable polymerization having a narrow molecular weight distribution and uniform molecular weight within a short polymerization reaction time at a low temperature, without a separate vacuum process, as compared with an existing polymerization method.
1. A method for producing a polyamide from a lactam by a coordinated anionic ring-opening polymerization reaction, comprising subjecting a reaction mixture comprising
the lactam, and
based on arts by weight of the lactam in its entirety, 0.01 parts by weight to 20 parts by weight of a metal alkoxide as an initiator, 0.01 parts by weight to 20 parts by weight of a metal hydride as a catalyst, and 0.002 parts by weight to 20 parts weight of carbon dioxide (CO 2 ) as an activator,
to a coordinated anionic ring-opening polymerization reaction.
2. The method of claim 1 , wherein the metal alkoxide comprises at least one selected from the group consisting of compounds represented by the following formula:
wherein, in the formula, R 1 to R 4 are each independently a hydrogen atom, an aryl group having 5 to 24 carbon atoms, or an alkyl group having 10 or less carbon atoms, and M is group 3 or 4 metals or transition metals.
3. The method of claim 1 , wherein the catalyst comprises sodium hydride, potassium hydride, or a combination thereof.
4. The method of claim 1 , wherein the reaction mixture further comprises one or more selected from the group consisting of ethylene-bis-stearamide (EBS), an amine compound, a urea compound, and a di-urea compound, which are a molecular weight controller.
5. The method of claim 1 , wherein the coordinated anionic ring-opening polymerization reaction is performed within a range of 0.5 minutes to 120 minutes.
6. The method of claim 1 , wherein the coordinated anionic ring-opening polymerization reaction is performed at 180° C. to 300° C.
7. The method of claim 1 , wherein the lactam in the coordinated anionic ring-opening polymerization reaction has a conversion rate of 95% or more.
8. The method of claim 1 , wherein the coordinated anionic ring- opening polymerization reaction is performed without a vacuum process.
9. A polyamide produced by the method of claim 1 .
10. The polyamide of claim 9 , wherein the polyamide has a polydispersity index (PDI) of 3.0 or less.
11. The polyamide of claim 9 , wherein a weight average molecular weight (Mw) of the polyamide is in a range of 20,000 to 100,000.
12. A parts material selected from the group consisting of a vehicle material, an electronic device material, an industrial pipe material, a construction engineering material, a 3 D printer material, a textile material, a cladding material, a machine tool material, a medical material, an aviation material, a photovoltaic material, a battery material, a sports material, a household appliance material, a household material, and a cosmetic material, which each include the polyamide of claim 9 .