STAR-SHAPED POLYMERS BY LIVING CATIONIC POLYMERIZATION - .7. AMPHIPHILIC GRAFT POLYMERS OF VINYL ETHERS WITH HYDROXYL-GROUPS - SYNTHESIS AND HOST-GUEST INTERACTION

被引:18
作者
KANAOKA, S [1 ]
SUEOKA, M [1 ]
SAWAMOTO, M [1 ]
HIGASHIMURA, T [1 ]
机构
[1] KYOTO UNIV,FAC ENGN,DEPT POLYMER CHEM,KYOTO 60601,JAPAN
关键词
GRAFT POLYMER; STAR-SHAPED POLYMER; LIVING POLYMERIZATION; CATIONIC POLYMERIZATION; AMPHIPHILIC POLYMER; HOST-GUEST INTERACTION;
D O I
10.1002/pola.1993.080311012
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Amphiphilic graft polymers of vinyl ethers (VEs) (6) where each branch consists of a hydrophilic polyalcohol and a hydrophobic poly (alkyl vinyl ether) segment were prepared on the basis of living cationic polymerization, and their properties and functions were compared with the corresponding amphiphilic star-shaped polymers. In toluene at -15-degrees-C, the HI/ZnI2-initiated living block polymer 2 of an ester-containing VE (CH2 = CHOCH2CH20COCH3) and isobutyl VE (IBVE) was terminated with the diethyl 2-(vinyloxy)ethylmalonate anion [3; (theta)C(COOEt)2CH2CH20CH=CH2] (2/3 = 1/2 mole ratio) to give a macromonomer (4), H[CH2CH(OCH2CH20COCH3)]m-[CH2CH(OiBu)]n-C(COOEt)2CH2CH20CH=CH2 (M = 5, n = 15; M(n)BAR = 2600, M(w)BAR/M(n)BAR = 1.13, 1.10 vinyl groups/chain). Subsequently, 4 was homopolymerized with HI/ZnI2 in toluene at -15-degrees-C. In 3 h, 85% of 4 was consumed and a graft polymer (5) was obtained [M(w)BAR = 15000, DP(n) (for 4) = 6]. The apparent M(w)BAR (10,900) of 5 by size-exclusion chromatography (SEC) is smaller than that by light scattering as well as that (18,300) by SEC of the corresponding linear polymer with the almost same molecular weight, indicating the formation of a multi-branched structure. Hydrolysis of the pendant esters in 5 gave the amphiphilic graft polymer 6 where each branch consists of a hydrophilic polyalcohol and a hydrophobic poly (IBVE) segment. The graft polymer 6 was found to interact specifically with small organic molecules (guests) with polar functional groups, and 6 differed in solubility and host-guest interaction from the corresponding star-shaped polymer. (C) 1993 John Wiley & Sons, Inc.
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页码:2513 / 2521
页数:9
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