Quantitatively Probing Cross-Termination in RAFT Polymerization by an Externally Applied Magnetic Field

被引：5

作者：

Lv, Ling ^{[1
,2
]}

Zhou, Jian ^{[1
,2
]}

Zou, Gang ^{[1
,2
]}

Zhang, Qijin ^{[1
,2
]}

机构：

[1] Univ Sci & Technol China, Sch Chem & Mat Sci, CAS Key Lab Soft Matter Chem, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Sch Chem & Mat Sci, Anhui Key Lab Optoelect Sci & Technol, Hefei 230026, Anhui, Peoples R China

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 2015年 / 216卷 / 06期

基金：

美国国家科学基金会;

关键词：

cross-termination; magnetic field; polystyrene; RAFT; retardation effect; ADDITION-FRAGMENTATION CHAIN; FREE-RADICAL POLYMERIZATION; MEDIATED POLYMERIZATION; METHYL-METHACRYLATE; RATE RETARDATION; INTERMEDIATE TERMINATION; BULK-POLYMERIZATION; RATE COEFFICIENT; IONIC MONOMERS; DITHIOBENZOATE;

D O I：

10.1002/macp.201400531

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Cross-termination in bulk reversible addition-fragmentation chain transfer (RAFT) polymerization is characterized by defining a new parameter, R-M, in terms of the polymerization rates with and without an externally applied magnetic field (EAMF). For the bulk RAFT polymerization (RAFTP) of styrene (St), mediated by (2-cyano-2-propyl)dithiobenzoate (CPDB) and S-1-dodecyl-S-(, -dimethyl--acetic acid)trithiocarbonate (DDMAT), an R-M of 0.534 and 0.382 is obtained respectively, showing a sensible dependence on the RAFT agent. It is also found that R-M has a close relationship with the strength of the EAMF and the concentration of the RAFT agent. Detailed discussion reveals that R-M can be used as a characteristic parameter to measure the extent of cross-termination in RAFTP. The experimental technique offers an efficient way to quantitatively probe the cross-termination in situ, and sheds light on the mechanism of RAFTP.

引用

页码：614 / 620

页数：7