Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Effect of Blowing Agents on Physical Properties of Polyurethane-polydimethylsiloxane Hybrid Foam

  • Asell Kim (Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University) ;
  • Hyeonwoo Jeong (Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University) ;
  • Sang Eun Shim (Department of Chemistry and Chemical Engineering, Education and Research Center for Smart Energy and Materials, Inha University)
  • Received : 2023.12.15
  • Accepted : 2023.12.22
  • Published : 2023.12.31
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Abstract

In this study, the properties of polyurethane-polydimethylsiloxane (PU-PDMS) hybrid foams containing different types and contents of physical blowing agents (PBAs) were investigated. Two types of blowing agents, namely physical blowing agents and thermally expandable microspheres (TEM), were applied. The apparent density was measured using precisely cut foam samples, and the pore size was measured using image software. In addition, the microstructure of the foam was confirmed via scanning electron microscopy and transmission electron microscopy. The thermal conductivities related to the microstructures of the different foams were compared. When 0.5 phr of the hydrocarbon-based PBA was added, the apparent density and pore size of the foam were minimal; however, the pore size was larger than that of neat foam. In contrast, the addition of 3 phr of TEM effectively reduced both the apparent density and pore size of the PBAs. The increase in resin viscosity owing to TEM could enhance bubble production stability, leading to the formation of more uniform and smaller pores. These results indicate that TEM is a highly efficient PBA that can be employed to decrease the weight and pore size of PU-PDMS hybrid foams.

Keywords

Acknowledgement

This work was supported by a grant (20010265) from Korea Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea. This work was supported by the Technology Innovation Program (20010559) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This work was supported by the Technology Innovation Program (20009983) funded by the Min-istry of Trade, Industry and Energy (MOTIE, Korea). This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A5A1019131).

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