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- W2002158510 abstract "The effects of linearity and rigidity of molecular chains and their cohesive energy density on the thermal expansion coefficient (TEC) and modulus of polyimide films were investigated, using various uniaxially stretched films. Rod-like polyimide film has a low TEC even in the case of unstretched film, and only more than 5% stretching gave a negative TEC. The larger the draw ratio, the larger the modulus in the machine direction became. By contrast, in the transverse direction, with an increase in draw ratio, the TEC became larger, and the modulus became smaller. These data suggest that this polyimide has a negative TEC and a very high modulus in the molecular chain direction, and a high TEC and a low modulus in the direction perpendicular to the molecular chain. In the cases of polyimides that had somewhat bent and rigid molecular chains, and flexible molecular chains, respectively, similar behaviour appeared. In the case of polyimide with a bent and flexible molecular chain, this behaviour hardly appeared. From these data, it was confirmed that the low TEC values of unstretched and biaxially fix-cured films were closely related not to the intermolecular cohesive energy and rigidity, but to the linearity of the molecular chain." @default.
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- W2002158510 date "1989-06-01" @default.
- W2002158510 modified "2023-10-14" @default.
- W2002158510 title "Thermal expansion coefficients and moduli of uniaxially stretched polyimide films with rigid and flexible molecular chains" @default.
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- W2002158510 doi "https://doi.org/10.1016/0032-3861(89)90100-6" @default.
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