Microstructure-Property Relationship in Self-Crosslinked Non-Derivative Acetic Acid Lignin-Containing Polyurethane Membranes

Baojian Liu, Zhongjin Li, Haihua Wang

Shaanxi University of Science & Technology, Xi’an, China.

DOI: 10.4236/gsc.2014.43021                

Abstract

With the assistance of different solvents, self-crosslinked acetic acid lignin-containing polyurethane (LPU) membranes were synthesized. Compared with tetrahydrofuran and dioxane, N, N-dimethylacetamide with stronger polarity together with higher boiling point was demonstrated to be beneficial for preparing LPU particles of smaller size and enhanced binding force. It was also found that lignin domain can interpenetrate into polyurethane domain well with 43.3% lignin addition, resulting in enhanced phase mixing and better performance. In addition, relative homogeneous and smooth LPU membrane can be obtained with 2% TMP addition, while stress crack took place when TMP content was greater than 3%.

Keywords

Polyurethane, Phase Behavior, Acetic Acid Lignin, Membrane, Microstructure

Conflicts of Interest

The authors declare no conflicts of interest.

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