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annealed at 140 C for 24 h, the diblock copolymers form two 15 S. Poser, H. Fischer and M. Arnold, Prog. Polym. Sci., 1998,
types of the microphase-separated morphologies, i.e. PDMS/ 23, 1337–1379.
POCN lamellae, and PDMS spheres embedded in POCN 16 G. P. Mao, J. G. Wang, S. R. Clingman, C. K. Ober, J. T. Chen
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morphological structures. The photoresponsive properties of 17 W. Y. Zheng, R. J. Albalak and P. T. Hammond,
the diblock copolymers are closely related with the condensa-
tion states. In solutions, the diblock copolymers (PDMS
POCN ) exhibit photoisomerization behaviour similar to that of
Macromolecules, 1998, 31, 2686–2689.
-b- 18 A. Schneider, J. J. Zanna, M. Yamada, H. Finkelmann and
R. Thomann, Macromolecules, 2000, 33, 649–651.
n
m
the homopolymer POCN. The as-cast lms of the polymers show 19 I. A. Ansari, V. Castelletto, T. Mykhaylyk, I. W. Hamley,
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aggregation can be observed in certain extent. Photo-
Z. B. Lu, T. Itoh and C. T. Imrie, Macromolecules, 2003, 36,
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behaviour of the annealed block copolymer lms depend on the 21 Y. Q. Tian, K. Watanabe, X. X. Kong, J. Abe and T. Iyoda,
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process resembles that of the as-cast lms, especially for those 22 S. Kadota, K. Aoki, S. Nagano and T. Seki, J. Am. Chem. Soc.,
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isomerization behaviour of the block copolymers compared to 23 Y. Morikawa, S. Nagano, K. Watanabe, K. Kamata, T. Iyoda
that of azo homopolymers can be attributed to the inuence of and T. Seki, Adv. Mater., 2006, 18, 883–886.
the morphological structures on the mesogen alignment of the 24 H. F. Yu, T. Iyoda and T. Ikeda, J. Am. Chem. Soc., 2006, 128,
block copolymers.
11010–11011.
2
2
2
5 H. F. Yu, Y. Naka, A. Shishido and T. Ikeda, Macromolecules,
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008, 41, 7959–7966.
6 L. Y. Shi, Z. H. Shen and X. H. Fan, Macromolecules, 2011, 44,
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Acknowledgements
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The nancial support from the NSFC under Projects 51233002 is
gratefully acknowledged.
7 L. Y. Shi, I. F. Hsieh, Y. Zhou, X. F. Yu, H. J. Tian, Y. Pan,
X. H. Fan and Z. H. Shen, Macromolecules, 2012, 45, 9719–
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8 K. Aoki, T. Iwata, S. Nagano and T. Seki, Macromol. Chem.
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