Characterizations of glycerol plasticized-starch (GPS)/carbon black (CB) membranes prepared by melt extrusion and microwave radiation |
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Authors: | Xiaofei Ma Peter R. Chang Jiugao Yu Peilin Lu |
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Affiliation: | aSchool of Science, Tianjin University, Tianjin 300072, China;bBioproducts and Bioprocesses National Science Program, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, Canada S7N 0X2 |
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Abstract: | As electrically conductive polymer composites, glycerol plasticized-starch (GPS)/carbon black (CB) membranes are respectively prepared by melt extrusion and microwave radiation. Scanning electron microscopy shows that the electrical conductance network of CB is formed in GPS/CB membranes, prepared by microwave radiation (GPS/CB-MR). However, the agglomerates of CB particles are isolated in GPS/CB membranes, prepared by melt extrusion (GPS/CB-ME). Fourier Transform Infrared (FTIR) spectroscopy reveals that CB and GPS matrix can form the interaction in GPS/CB membranes. According to Nicholais–Narkis models, the reinforcing effect of CB is more obvious in GPS/CB-MR membranes than in GPS/CB-ME membranes. GPS/CB-MR membranes exhibit a low electrical percolation threshold of 2.398 vol% CB loading and the conductivity of the membrane containing 4.236 vol% CB reaches 7.08 S/cm, while GPS/CB-ME membranes shows a very low conductivity of 10−8 S/cm at the high CB content. In addition, GPS/CB-MR membranes have better water vapor barrier than GPS/CB-ME membranes. |
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Keywords: | Carbon black Electrical properties Melt extrusion Microwave radiation Starch |
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