期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 32, 期 1, 页码 74-81出版社
WILEY-BLACKWELL
DOI: 10.1002/marc.201000477
关键词
atom transfer radical polymerization (ATRP); free radical polymerization (FRP); star polymers; water
资金
- NSF [DMR 09-69301]
- CRP Consortium at Carnegie Mellon University
- Bayer Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [969301] Funding Source: National Science Foundation
Amphiphilic star shaped polymers with poly(ethylene oxide) (PEO) arms and cross-linked hydrophobic core were synthesized in water via either conventional free radical polymerization (FRP) or atom transfer radical polymerization (ATRP) techniques using a simple arm-first'' method. In FRP, PEO based macromonomers (MM) were used as arm precursors, which were then cross-linked by divinylbenzene (DVB) using 2,2'-azoisobutyronitrile (AIBN). Uniform star polymers ((M) over bar (w)= (M) over bar (n) < 1.2) were achieved through adjustment of the ratio of PEO MM, DVB, and AIBN. While in case of ATRP, both PEO MM, and PEO based macroinitiator (MI) were used as arm precursors with ethylene glycol diacrylate as cross-linker. Even more uniform star polymers with less contamination by low MW polymers were obtained, as compared to the products synthesized by FRP.
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