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- W2020704247 abstract "Lamella spacings, specific volumes and melting points have been determined for a series of well characterized poly(propylene oxide)/poly(ethylene oxide) type PE block copolymers with E-block length 40 chain units and P-block lengths 0 to 11 chain units. These properties are interpreted in terms of a stacked lamella model with alternating amorphous and crystalline layers. The crystalline lamella thickness is found to be about 25 E chain units, i.e. the crystals are predominantly of extended-chain type. The specific volume of the polymer in the amorphous lamellae is found to be lower than that of polymer of corresponding composition in the supercooled melt. The melting points are low compared to that of perfectly crystalline poly(ethylene oxide), i.e. 47 to 51°C compared with T0m = 76°C. This is due to the positive free energy of formation from the melt of the amorphous layer (σ5 ∼ 3.5 kJ/mol) and the crystalline/amorphous) interface (σo ∼ 3 kJ/mol)." @default.
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- W2020704247 date "1975-12-01" @default.
- W2020704247 modified "2023-09-28" @default.
- W2020704247 title "Crystallinity and fusion of ethylene oxide/propylene oxide block copolymers: 1. Type PE copolymers" @default.
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- W2020704247 doi "https://doi.org/10.1016/0032-3861(75)90209-8" @default.
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