Waterborne anionic polyurethanes and poly(urethane-urea)s: influence of the chain extender on mechanical and adhesive properties

被引：179
|
作者：
Delpech, MC
Coutinho, FMB
机构：
[1] UFRJ, IMA, Inst Macromol Professora Eloisa Mano, BR-21945970 Rio De Janeiro, Brazil
[2] UERJ, IQ, Dept Proc Ind, Rio De Janeiro, Brazil
来源：
POLYMER TESTING | 2000年 / 19卷 / 08期
关键词：
D O I：
10.1016/S0142-9418(99)00066-5
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Polyurethane and poly(urethane-urea) aqueous dispersions based on 4,4'-dicyclohexylmethane diisocyanate (H12MDI), poly(propylene glycol) (PPG) and dimethylolpropionic acid (DMPA) were synthesized, Three types of chain extenders were used, hydrazine (HYD) and ethylenediamine (EDA), producing poly(urethane-urea)s and ethylene glycol (EG), polyurethanes. The dispersion was performed before or after the chain extension reaction, depending on the extender employed. The dispersions were prepared with and without the addition of acetone after the prepolymer synthesis and neutralization steps. The length of soft segment and NCO/OH ratio were varied. Some mechanical properties of cast films obtained from the aqueous dispersions, the characteristics of coating application on a wood surface and their adhesive properties were evaluated. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：939 / 952
页数：14
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