Phase Behavior of Deuterated Polystyrene-block-poly(n-pentyl methacrylate) Copolymers
作者： Du Yeol Ryu , Unyong Jeong , Dong Hyun Lee , Jehan Kim , Hwa Shik Youn
DOI: 10.1021/MA026002G
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摘要: The phase behavior of deuterated polystyrene-block-poly(n-pentyl methacrylate) copolymers (dPS−PnPMA) was investigated by using small-angle X-ray (SAXS) and neutron (SANS) scatterings rheology. This block copolymer exhibited a closed-loop type as did hydrogenated PS−PnPMA copolymers. closed loop consists two transitions: lower disorder-to-order transition (LDOT) upper order-to-disorder (UODT) occurring at higher temperature, respectively. segmental interaction parameter (χ) between dPS PnPMA blocks various temperatures obtained fitting the incompressible random approximation theory to SANS results low molecular weight dPS−PnPMA exhibiting disordered homogeneous state over entire temperature range. We found that χ increased initially with increasing (T), achieved maximum, then decreased. Such is in keeping polymer blends or would exhi...
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