Unexpected crosslinking during acetoacetoxy group protection on waterborne crosslinkable latexes

被引：13
作者：
Gonzalez, Inigo
Arzamendi, Gurutze
Asua, Jose M.
Leiza, Jose R.
机构：
[1] Univ Basque Country, Fac Ciencias Quim, Inst Polymer Mat, POLYMAT, San Sebastian 20080, Spain
[2] Univ Basque Country, Fac Ciencias Quim, Dpto Quim Aplicada, Grp Ingn Quim, San Sebastian 20080, Spain
[3] Univ Publ Navarra, Dept Quim Aplicada, Pamplona 31006, Spain
来源：
MACROMOLECULAR MATERIALS AND ENGINEERING | 2006年 / 291卷 / 10期
关键词：
acetoacetoxy ethyl methacrylate; crosslinking; gel content; mechanical properties;
D O I：
10.1002/mame.200600235
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure of the polymer synthesized by seeded semicontinuous emulsion copolymerization of AAEMA was investigated. It was found that the neutralization of the latexes with ammonia to protect acetoacetoxy functionality against hydrolysis during storage had a remarkable effect on the gel content. A base catalyzed Michael addition reaction between acetoacetoxy groups and terminal double bond (TDB) is proposed as responsible for the chain precrosslinking observed. The presence of TDB in the latexes was demonstrated by means of H-1 NMR. Moreover, the chain precrosslinking affected the subsequent crosslinking reaction of the latex with diamines hindering chain interdiffusion and yielding poorer mechanical properties.
引用
收藏
页码：1185 / 1193
页数：9
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