Stability of the Fddd Phase in Diblock Copolymer Melts
Stability of the Fddd Phase in Diblock Copolymer Melts
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DOI：
10.1021/ma801268d
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发表时间：
2008-10
期刊：
影响因子：
5.5
通讯作者：
M. Kim;Tsutomu Wakada;S. Akasaka;S. Nishitsuji;K. Saijo;H. Hasegawa;Kazuki Ito;M. Takenaka
中科院分区：
文献类型：
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作者：
M. Kim;Tsutomu Wakada;S. Akasaka;S. Nishitsuji;K. Saijo;H. Hasegawa;Kazuki Ito;M. Takenaka
通过小角X射线散射和透射电子显微镜研究了Fddd相在两嵌段共聚物熔体中作为平衡相的稳定性。在150 °C下退火2天后，Fddd结构仍然存在，其中Fddd在先前的研究（Takenaka et al. Macromolecules 2007，40，4399）中被发现用于聚（苯乙烯-嵌段-异戊二烯）（S-I）。研究了层片（L）和Fddd之间以及螺旋（G）和Fddd之间的有序-有序转变（OOT）的热可逆性。在150 °C下长时间退火诱导L和G向Fddd的转变，表明Fddd在150 °C下比L和G更稳定。通过在130和170 °C下退火，Fddd分别转化为L和G。这些结果支持了L和Fddd之间以及G和Fddd之间的OOT是热可逆的。退火2天后Fddd结构的稳定性和OOT中热可逆性的确认澄清了Fddd相在OOT中作为平衡相存在。
The stability of the Fddd phase as an equilibrium phase in diblock copolymer melts was examined by using small-angle X-ray scattering and transmission electron microscopy. After 2 days of annealing at 150 °C where Fddd was found in a previous study (Takenaka et al. Macromolecules 2007, 40, 4399) for the poly(styrene-block-isoprene) (S−I), the Fddd structure still survived. The thermoreversibility in the order−order transitions (OOTs) between lamella (L) and Fddd and between gyroid (G) and Fddd was investigated. The long-time annealing at 150 °C induced the transformation from L and G to Fddd, indicating that Fddd is more stable than L and G at 150 °C. Fddd transformed into L and G, respectively, by annealing at 130 and 170 °C. These results supported that the OOTs between L and Fddd and between G and Fddd are thermoreversible. The stability of the Fddd structure after 2 days of annealing and the confirmation of the thermoreversibility in OOTs clarified that the Fddd phase exists as an equilibrium phase in...