Thermal properties, rheology and foams of polystyrene-block-poly(4-vinylpyridine) diblock copolymers
作者： Maria Schulze , Ulrich A. Handge , Sofia Rangou , Jelena Lillepärg , Volker Abetz
DOI: 10.1016/J.POLYMER.2015.06.005
关键词:
摘要: Abstract In this study, the thermal and rheological properties of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymers are investigated in order to get information about optimum foaming temperature. Foams these were prepared using technique batch with carbon dioxide as environmentally-benign blowing agent. The tailored PS-b-P4VP different molecular weights a cylindrical morphology analysed regarding their stability. High-pressure differential scanning calorimetry exposes plasticising effect agent which yields decrease glass transition temperature polystyrene poly(4-vinylpyridine) blocks. Sorption measurements performed measure uptake copolymer. Additionally, experiments oscillatory mode conducted confirmed microphase-separated structure by plateau storage loss moduli range processing. shear melt elongation, transient viscosity elongational much smaller than linear viscoelastic prediction at later times. analysis foam revealed that density measured via Archimedes' principle exhibits lowest weight 160 kg mol−1.
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