| 초록 |
Synthesis of functionalized polyisocyanates was approached through thiol-ene click chemistry as a post-polymerization modification. First, the polyisocyanate, which include the alkenyl group in the side-chain was prepared by anionic polymerization of allyl isocyanate (AIC) using sodium benzanilide (Na-BA) as an initiator and acetyl chloride as a terminator in tetrahydrofuran (THF) at -98 ℃ under high vacuum (10-6 Torr). The polymerization resulted in poly(allyl isocyanate) (PAIC) having predictable molecular weight and narrow molecular weight distribution. Furthermore, most of the allyl groups remained unreacted in a resulting polymer. PAIC block copolymers including poly(n-hexyl isocyanate) (PHIC) block were prepared. Resulting PAIC-b-PHICs was used for thiol-ene click reaction with 2-mecaptoethanol and 2,2'-azobis(4-methoxy-2.4-dimethyl valeronitrile) (V-70) radical initiator. Functionality of the block copolymer was confirmed by NMR, SEC-MALLS and FT-IR analysis. |
