Related Experiment Videos
[Development of morphology and mechanical properties in polyurethane-urea(PUU) curing process]
Zai-feng Li1, Chun-ming Xu, Shu-mei Yin
1Department of Applied Chemistry, Qingdao Institute of Chemical Technology, Qingdao 102200, China.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|August 27, 2003
Summary
This study investigated polyurethaneureas (PUU) during bulk prepolymer polymerization. FTIR and TEM revealed that increasing reaction time enhances hydrogen bonding, leading to clearer hard segment domains and improved mechanical properties.
Area of Science:
- Polymer Science
- Materials Science
Context:
- Investigating the bulk prepolymer polymerization process of polyurethaneureas (PUU).
- Utilizing Transmission Electron Microscopy (TEM) and in situ Fourier-Transform Infrared (FTIR) spectroscopy for analysis.
Purpose:
- To understand the evolution of morphology and mechanical properties of PUU during polymerization.
- To correlate changes in chemical structure with morphological development.
Summary:
- FTIR analysis indicated shifts in NH and carbonyl band positions and intensities with increasing reaction time, signifying hydrogen bond formation.
- TEM imaging demonstrated the progressive clarification of hard segment domains as hydrogen bonding between urea linkages intensified.
- Vibrational modes of carbonyl bands during curing were assigned, correlating spectral changes with polymer structure.
Impact:
- Provides insights into the structure-property relationships of PUU during synthesis.
- Contributes to the understanding of polymer network formation and morphology development.
- Informs the optimization of PUU synthesis for desired material characteristics.