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- W2890162972 abstract "The mechanical properties of a styrene–butadiene–styreneblock copolymer (Shell Cariflex K101) have been found to bedependent upon the morphology of the polymer, which could be alteredby thermal or solvent treatments. Films cast from toluene, methylenechloride and methyl cyclohexane and moulded samples are compared. Small-angle X-ray scattering, electron microscopic and swellingtechniques have been used to determine the morphology of thesamples. Macro-lattice models based on the microphase separationof the two chemical species into domains and matrix have beenproposed for the toluene and methylene chloride cast samples.Properties which have been found to differ are the dynamicmechanical spectra, stress-strain behaviour, stress relaxation andcreep. The dynamic mechanical apparatus as described by Bowman has been improved and modified and has been used to measurethe Young's temperaturemoduli and loss tangent of the(-150°C to +120°C) and frequencysamples over a widerange (0.01Hz to 1000Hz).The network characteristic of this system has been attributedto the entanglements of the polybutadiene chains, the physicaladsorption of the polybutadiene chains onto the domain surface andthe polybutadiene–polystyrene junctions. The ultimate propertieshave been shown to be those of the rubbery matrix but are highly enhanced by the polystyrene domains acting as reinforcing fillers.Preliminary work has been carried out in the synthesis of the XYX type of block copolymer where X is a crystalline segment (poly 3,3-bis(chloromethyl) oxetane) and Y is an elastomeric segment (tetrahydrofuran/3,3-bis(chloromethyl) oxetane copolymer)." @default.
- W2890162972 created "2018-09-27" @default.
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- W2890162972 date "1970-01-01" @default.
- W2890162972 modified "2023-09-24" @default.
- W2890162972 title "A study of the structure, properties and synthesis of block copolymers" @default.
- W2890162972 hasPublicationYear "1970" @default.
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