Polymer Crystallization in 25-nm Spheres

Tipo de material: Texto

TextoSeries ; Physical Review Letters, 84, p.4120-4123, 2000Trabajos contenidos:

Loo, Y.L
Register, R.E
Ryan, A.J

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Resumen: Crystallization within the discrete spheres of a block copolymer mesophase was studied by timeresolved x-ray scattering. The cubic packing of microdomains, established by self-assembly in the melt, is preserved throughout crystallization by strong interblock segregation even though the amorphous matrix block is well above its glass transition temperature. Homogeneous nucleation within each sphere yields isothermal crystallizations which follow first-order kinetics, contrasting with the sigmoidal kinetics normally exhibited in the quiescent crystallization of bulk polymers.

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Crystallization within the discrete spheres of a block copolymer mesophase was studied by timeresolved x-ray scattering. The cubic packing of microdomains, established by self-assembly in the melt, is preserved throughout crystallization by strong interblock segregation even though the amorphous matrix block is well above its glass transition temperature. Homogeneous nucleation within each sphere yields isothermal crystallizations which follow first-order kinetics, contrasting with the sigmoidal kinetics normally exhibited in the quiescent crystallization of bulk polymers.

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