Immortal CO2/Propylene Oxide Copolymerization: Precise Control of Molecular Weight and Architecture of Various Block Copolymers

被引：143
作者：
Cyriac, Anish [1 ]
Lee, Sang Hwan [1 ]
Varghese, Jobi Kodiyan [1 ]
Park, Eun Seok [1 ]
Park, Ji Hae [1 ]
Lee, Bun Yeoul [1 ]
机构：
[1] Ajou Univ, Dept Mol Sci & Technol, Suwon 443749, South Korea
来源：
MACROMOLECULES | 2010年 / 43卷 / 18期
关键词：
BINARY CATALYST SYSTEMS; CARBON-DIOXIDE; CO2/EPOXIDE COPOLYMERIZATION; ALTERNATING COPOLYMERIZATION; COBALT CATALYSTS; EPOXIDES; CO2; POLYMERIZATION; POLYCARBONATE; POLYURETHANES;
D O I：
10.1021/ma101259k
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The CO2/propylene oxide (PO) copolymerization is reported. 2,4-nitrophenolate (DNP) anions attack PO, becoming alkoxide anions which subsequently react with CO2 to be carbonate anions in the polymerization reaction. The anion at a growing-chain end deprotonates water to be a neutral polymer chain, and a new polymer chain starts to grow from the generated hydroxyl anion in the presence of water impurity. The neutral polymer chain is dormant, but it re-enters the chain-growing process when it is reversely deprotonated, consequently resulting in a bimodal distribution in the GPC curve. Polymer chains in the main high-molecular-weight modal are the ones grown biaxially from adipic acid, while those of the minor low-molecular-weight modal are the ones grown from NO3- or acetate anion. A poly(ethylene glycol) (PEG) melting signal is observed at 53-55 °C along with a poly(propylene carbonate) (PPC) Tg signal in the DSC studies of PPC-block-PEG copolymers that are produced by feeding high-molecular-weight PEG.
引用
收藏
页码：7398 / 7401
页数：4
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