Synthesis and characterization of polyurethane aqueous dispersions based on poly(ethylene glycol) and poly(propylene glycol) block copolymers

被引：7
|
作者：
Coutinho, Fernanda M. B. [1 ]
Delpech, Marcia C. [1 ]
Santos, Cristiane C. [1 ]
Almeida, Rosilea B. L. [1 ]
机构：
[1] Univ Estado Rio de Janeiro, Inst Quim, BR-20559900 Rio De Janeiro, Brazil
来源：
QUIMICA NOVA | 2008年 / 31卷 / 06期
关键词：
polyurethane; aqueous dispersions; non-polluting systems;
D O I：
10.1590/S0100-40422008000600030
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Non-polluting polyurethane aqueous dispersions, with 40% of solids content, were synthesized based on block copolymers of poly(ethylene glycol) and poly(propylene glycol) (PEG-b-PPG), with PEG hydrophilic segments content of 7 and 25%, poly(propylene glycol) (PPG), dimethylolpropionic acid (DMPA). isophorone diisocyanate (IPDI), and hydrazine. Different formulations were synthesized by varying the equivalent-grams ratios between isocyanate and hydroxyl groups (NCO/OH) and PPG and (PEG-b-PPG). The presence of high amounts of PEG in the formulations provoked the formation of gels. Average particle size and viscosity of the dispersions were determined. Mechanical properties and water absorption resistance of cast films were evaluated.
引用
收藏
页码：1437 / 1443
页数：7
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