Water vapor permeability of thermosensitive polyurethane films obtained from isophorone diisocyanate and polyester or polyether polyol
Water vapor permeability of thermosensitive polyurethane films obtained from isophorone diisocyanate and polyester or polyether polyol
复制标题
DOI：
10.1007/s10853-016-0397-3
复制
发表时间：
2016
影响因子：
4.5
通讯作者：
Aude Morel;F. Salaün;F. Salaün;G. Bedek;Daniel Dupont;Stéphane Giraud;Stéphane Giraud
中科院分区：
文献类型：
--
作者：
Aude Morel;F. Salaün;F. Salaün;G. Bedek;Daniel Dupont;Stéphane Giraud;Stéphane Giraud
以两种多元醇和异佛尔酮二异氰酸酯为原料，采用两步聚合法合成聚氨酯水分散体，制备了一系列消防用热敏薄膜。通过ATR红外光谱、差示扫描量热法、热重分析、水蒸气渗透性、溶胀行为、接触角测量和动态力学分析等手段，研究了多元醇的种类、链长和硬段含量等参数对薄膜化学、热学、力学和扩散性能的影响。结果表明，软段结晶对湿传递有一定的影响。事实上，它增强了链的流动性，在散装材料导致增加水蒸气渗透性，而不是在溶胀。相比之下，低结晶导致表面状态改性，从而导致更高的膨胀能力。
A series of thermosensitive films for firefighting applications were synthesized by two-step polymerization from two types of polyol and isophorone diisocyanate and by the formation of aqueous polyurethane dispersions. This study was conducted to clarify the influence of different parameters such as the type of polyol, the chain length of polyol, and the hard segment content on the chemical, thermal, mechanical and diffusion properties of the final films using ATR infrared spectroscopy, differential scanning calorimetry, thermogravimetric analyses, water vapor permeability, swelling behavior, contact angle measurement, and dynamic mechanical analyses. It was noticed that the humidity transfer was influenced by the soft segment crystallization. Indeed, it enhanced the chain mobility in bulk materials leading to an increase in water vapor permeability rather than in swelling. In contrast, low crystallization induced surface state modification resulting in higher swelling capacity.