OS15-1-3 Microphase-separated structure and mechanical properties of polycarbonbate (PC) glycols and polyurethanes incorporating PC glycols

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The effect of number of methylene chain of aliphatic polycarbonate glycol (C_3-C_6) on their properties themselves and polyurethane elastomers (PUEs) incorporating them was investigated. Viscosity of the PC glycols decreased with increasing number of methylene chain. The PC glycols with even numbers of methylene chain (C_4 and C_6) were more crystallizable than for odd numbers (C_3 and C_5). The degree of microphase separation of the PC glycol-based PUEs became stronger with decreasing number of methylene chain. In the tensile testing, the PC glycol-based PUEs with even number of methylene chain exhibited larger tensile strength and smaller strain at break in comparison with those with odd number. Odd-even effect of methylene chains was clearly observed not only the properties of the original PC glycols but also those of the PUEs incorporating these PC glycols.

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