Subject Development of CO2 conversion to polycarbonates and their monomers (Ajou Univ, Bun Yeoul Lee)
Name KCRC Date 2015-03-30 Hit 1194

□ Overview

• Preparation of high-molecular weight PBC from CO2 (molecular weight: >100,000)

• Preparation of hight-molecular weight and good quality PBCT from CO2, PTA, and renewable BD (molecular weight: 100,000 - 200,000, Tm 100-150 oC)

• Preparation of PC-polyols (polyurethane monomers) from CO2


□ Background

• A super active catalyst had been discovered for the copolymerization of CO2 and epoxides, which was transferred to industrial sector (Kr 10-0853358), trade name GreenPol.
Even though the copolymers have many merits such as biodegradability, cleaning burning, good barrier, and good adhesive properties, its widespread application is limited because of its thermal properties (Tg, 40 ℃ or 20 ℃).


□ Inventiveness

• A new preparation method was invented for aliphatic polycarbonates (poly(1,4-butylene carbonate: PBC) using condensation polymerization of 1,4-butanediol (BD) with dimethyl carbonate (DMC). DMC is easily prepared in industry using CO2 as a feedstock. The prepared PBC is a crystalline polymer with high molecular weight (Mw >100,000), melting temperature (Tm) 60℃, and also biodegradable.
※ BD is preparable from coal or more environmentally friendly from renewable resources.



• A new polymer, poly(1,4-butylene carbonate-coterephthalate) (PBCT) was invented by feeding substantial amount of dimethyl terephthalate (DMT) in the process of PBC preparation to increase Tm (tuneable, 100~150℃). DMT is abundant and inexpensive chemical.



• A new process was invented to prepare new type of aliphatic polycarbonate-polyols which may potentially be applied as a raw material in polyurethane industry by chopping highmolecular-weight PBC with various diols or triols.



□ Applications

• This biodegradable green polymers can replace the conventional polymers as like PE, PU. It may be utilized in various fields.

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