期刊
FIBERS AND POLYMERS
卷 15, 期 7, 页码 1349-1356出版社
KOREAN FIBER SOC
DOI: 10.1007/s12221-014-1349-7
关键词
PLA; PEG; Polyurethane foams; Water absorbency; Mechanical properties
资金
- National Research Foundation of Korea (NRF) - Ministry of Education, Science Technology [R11-2005-065]
- National Research Foundation of Korea (NRF) - Korean government (MEST) [20110015593]
- Research Institute for Agriculture and Life Sciences at Seoul National University
Polyurethanes are polymers with urethane linkages in their backbone. It is prepared by polyaddition polymerization between isocyanates and polyols, which produce different chemical, physical, and mechanical properties depending on their types and characteristics. Previous reports of polyurethane foams prepared by using PEG polyol indicated prominent features in the elasticity and recovery of the foams. However, it is necessary to improve the mechanical strength of these materials. In this study, polyurethane foams were prepared using a PLA/PEG polyol mixture and 1,6-hexamethylene diisocyanate. PLA polyol was synthesized by the direct condensation polymerization of lactic acid. The polyurethane foams were characterized using FE-SEM analysis, FT-IR spectroscopy, water absorbency measurement, and mechanical property measurement. In FE-SEM analysis, it was shown that the PLA content of polyol mixture significantly affected the porous structure. FT-IR. spectra confirmed that urethane linkages formed between the PLA/PEG polyols and the isocyanates. The water absorbency decreased due to the hydrophobicity of PLA. With respect to the mechanical properties, the breaking stress and the Young's modulus increased with increasing PLA content. When the PLA content of polyols was 60 and 70 percent, the breaking strain was significantly higher than those of other polyurethane foams.
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