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Positron annihilation lifetime spectroscopy for miscibility investigations of styrene–butadiene–styrene copolymer/polystyrene blends

Authors

  • Xiaoyu Meng,

    Corresponding author
    1. College of Science, China University of Petroleum (Beijing), Beijing, China
    2. Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/gas Facilities, Beijing, China
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  • Xu Liu,

    1. College of Science, China University of Petroleum (Beijing), Beijing, China
    2. Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/gas Facilities, Beijing, China
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  • Zhuoxi Li,

    1. Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
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  • Qiong Zhou

    1. College of Science, China University of Petroleum (Beijing), Beijing, China
    2. Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/gas Facilities, Beijing, China
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Abstract

The free volume parameters of styrene–butadiene–styrene copolymer/polystyrene (SBS/PS) blends were investigated with positron annihilation lifetime spectroscopy (PALS) in this study. The behaviors of free volume distribution, average free volume, and relative fractional free volume revealed the difference of interfacial miscibility. Based on different models, inter-chain interaction parameter β, geometric factor γ, and hydrodynamic interaction parameter α obtained from free volume data were employed to further determine the effect of molecular architecture and styrene content on the miscibility. The results suggest the better miscibility in star-shaped SBS/PS blends than that of corresponding linear SBS/PS systems, even than that of systems containing more styrene unit. In addition, differential scanning calorimetry, dynamic mechanical analysis, and scanning electron microscopy, which are sensitive to heterogeneities in larger domain size, give different results of miscibility from free volume data. It should be attributed the difference of characterization scale. The mechanical property corroborates the results of miscibility. POLYM. ENG. SCI., 54:785–793, 2014. © 2013 Society of Plastics Engineers

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