US EPA

8336134 

Meetings & Symposia 

Cationic polymerization of vinyl Ether with both a urethane group and an oxyethylene chain: Living polymerization and properties of the produced polymers 

Ichimura, K; Namikoshi, T; Urushisaki, M; Hashimoto, T 

2006 

Toyama 

55th Society of Polymer Science Japan Symposium on Macromolecules 

55 

2 

2804 

Japanese 

New vinyl ethers 1 and 2 with both a urethane group and an oxyethylene chain were synthesized by reaction of phenyl isocyanate with diethylene glycol monovinyl ether and triethylene glycol monovinyl ether, respectively. These vinyl ethers were polymerized by BF3OEt2 in CH 2Cl2 at -30°C to give the polymers in quantitative yield. The HCl/ZnCl2-initiated polymerization of vinyl ether 1 also proceeded in CH2Cl2 at -30°C. The number-average molecular weights (Mn's) of the product polymers were in direct proportion to monomer conversion, although their molecular weight distributions (MWDs) were somewhat broad (Mw/Mn = 1,1-1,3). The glass transition temperature of the obtained poly(1) and poly(2) were 34°C and 14°C, respectively. Poly(1) was soluble in chloroform, tetrahydrofuran, dichloromethane, acetone, nitroethane, and dimethylsulfoxide, but insoluble in hexane, toluene, dimethyl ether and 1-propanol. Poly(2) showed a similar solubility, but it was soluble in 1-propanol at 90°C. 

Cationic polymerization; Glass transition temperature; Living polymerization; Oxyethylene; Urethane; Vinyl ether