• Journal of the Korea Organic Resources Recycling Association
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• v.19 no.4
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• pp.60-65
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• 2011

Siloxane is an organic silicon compound and is volatilized into the bio gas from anaerobic digestion. It causes failure of gas combustion engines using the bio gas. Siloxane emission characteristics should be identified to provide a proper siloxane control. This study focuses on characterizing siloxane emission in bio gas from an anaerobic digester of food wastewater operating from January to March. The concentrations of total average siloxane and cycle-siloxane D4 were detected to be 9.5 and $4.0mg\;siloxane/m^3$, respectively. The concentrations of cycle-siloxane and linear-siloxane were resulted in D4>D5>D6 and L4>L3>L5>L2, respectively. The total siloxane concentration was the lowest in January and the highest in March.

• Polymer(Korea)
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• v.33 no.6
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• pp.569-574
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• 2009

Organic- inorganic hybrid waterborne polyurethane (PUD) is synthesized by using hybrid polyol consist of carbonate (PCD), ester (PCL), and siloxane (PDSBP) in order to enhance anti-scratch property of PUD film. The diameter of graft type PUD emulsion is bigger than that of linear type PUD due to the graft structure of hydrophobic siloxane chain. The glass transition temperature of linear type PUD increase and the decomposition temperature of linear type PUD decrease with the content of PCD polyol. While, the decomposition temperature of graft type PUD almost same with increasing PDSBP content. The anti-scratch property and pencil hardness of graft type PUD improves as adding PDSBP polyol in the hybrid polyol system. When 9 wt% of PDSBP polyol is mixed, PUD films shows excellent anti-scratch property (~3.3 N), and pencil hardness (> 9 H).