Spectroscopic study of the morphology development of closed-cell polyurethane foam using bio-based malonic acid as chain extender

POLYMER

卷:193

Article

Zhao, Weiwei¹  Nolan, Bradford¹  Bermudez, Harry¹  Hsu, Shaw Ling¹  Choudhary, Umesh²  van Walsem, Johan² 

[1] Univ Massachusetts, Polymer Sci & Engn, Amherst, MA 01003 USA

[2] Lygos Inc, Berkeley, CA 94710 USA

关键词: Closed-cell;    Polyurethane foam;    Chain extender;    Malonic acid;    Morphology;   

DOI  :  10.1016/j.polymer.2020.122344

来源: Elsevier

【 摘 要 】

In this study the advantages of using bio-based multi-functional malonic acid salt as chain extender in preparing closed cell polyurethane foams is demonstrated. We found that the presence of malonic acid salt can alter the reaction kinetics, segmental mobility and hence the relative kinetics of polyurethane and polyurea formation. By analyzing the infrared active vibrations, it is demonstrated that the formation of urethane and urea linkages is accelerated at the initial stage of reaction, resulting in enhanced viscosity build-up attributed to the catalytic activity of the triethylamine complexed with malonic acid. The relative kinetics in formation of different morphological features thus can be used to control the cell opening process. These results, combining information on polymerization kinetics, gas evolution and phase separation, illustrate the capability of using malonic acid salt as the chain extender to manipulate polyurethane foam morphology and its potential application in polyurethane closed cell foam systems.

【 授权许可】

Free