The possibility of living or long-lived cationic polymerization in the butyl vinyl ether iodine liquid sulfur dioxide system

被引：1
|
作者：
Oliveira, MG [1 ]
Moreira, ACF [1 ]
Brandao, GT [1 ]
Gomes, AS [1 ]
Soares, BG [1 ]
机构：
[1] UNIV FED RIO DE JANEIRO,INST MACROMOL,BR-21945 RIO JANEIRO,RJ,BRAZIL
来源：
MACROMOLECULAR CHEMISTRY AND PHYSICS | 1997年 / 198卷 / 06期
关键词：
D O I：
10.1002/macp.1997.021980621
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 polymerization of butyl vinyl ether (nBuVE) initiated by iodine in the presence of liquid sulfur dioxide has been investigated. The number-average molecular weight increased with monomer concentration and after the addition of a fresh feed of the monomer at the end of the first polymerization step. This behavior has been observed in media of different polarity, that is, SO2/toluene = 80:10 or 50:40 v/v and SO2/CH2Cl2 = 20:70 v/v. H-1 NMR spectroscopy revealed the presence of aldehyde terminal group derived from acetal end group, indicating the presence of living or long-lived propagating species. The average number of polymer chains carrying aldehyde end groups is higher than the initial iodine concentration, suggesting that an additional initiation process by hydrogen iodide is taking place.
引用
收藏
页码：1933 / 1942
页数：10
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