| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.343 |
| 발표분야 | 고분자 합성 |
| 제목 | Polyurethane Using Polyetherpolyol based on Poly(EO-co-THF) |
| 초록 | Cationic ring-opening copolymerization of tetrahydrofuran (THF) and ethylene oxide (EO) leaded to hydroxyl-terminated polyether, and it was carried out by use BF3O(C2H5)2 as catalyst in the presence of 1,4-butanediol as initiator. Various concentration ratios of [catalyst]/[1,4-butanediol], [monomer]/[1,4-butanediol] affected molecular weight and yield, and feed ratio of EO/THF determinated the mole precent of EO and THF units in copolymer. In this system, molecular weight of poly(EO-co-THF) was merely dependant on the ratio of [monomer]/[butanediol], but not on catalyst. It showed that this cationic copolymerization follow activated monomer mechanism (AMM), which overwhelmingly took more weight than activated chain end (ACE) mechanism that held great inclination to side reaction (i. e. oligomeric cyclic ether), and well-fined linear products are obtained. It followed from kinetic considerations, that in order to achieve the high contribution of AMM, the reaction should be carried out at low instantaneous monomer concentration, and this was accomplished by droplet addition of monomer mixture instead of one-shot addition. And this polyetherpolyol synthesized via AMM are strictly bifunctional in the performance of closing to 2. A series of neat thermoplastic polyurethane (TPU) using polyetherpolyol based on poly (EO-co-THF) were synthesized with isophorone diisocyanate (IPDI). In the premise of the determination of hydroxyl group reactivity via titration testing to fix the reaction time, in this system of polyetherpolyol/IPDI/catalyst polyurethane synthesis, molecular weight was controlled in the method of slightly nonstoichiometric (IPDI was excess) via varying NCO/OH ratio in the range of 1.00 to 1.10. The polymers obtained were characterized by gel permeation chromatography (GPC), infrared spectroscopy (IR), nuclear magnetic resonance (NMR), differential scanning carlorimetry (DSC), and scanning electron microscopy (SEM) to study the properties and morphology. Fig. 1 FT-IR compares |
| 저자 | 판샤오1, 이범재1, 황갑성2 |
| 소속 | 1충남대, 2국방과학(연) |
| 키워드 | Thermoplastic polyurethane; Poly(EO-co-THF); Hydrogen bonding; Morphology; tetrahydrofuran; activated chain end; activated monomer mechanism |
