Abstract
Thermal behavior, molecular aggregation structure, and water repellency for poly{2-[(perfluorooctylethyl)carbamate]ethyl}acrylate (PFAUr-C8) were studied by differential scanning calorimetry (DSC), polarized optical microscopy (POM), wide-angle X-ray diffraction (WAXD), grazing-incidence wide-angle X-ray diffraction (GI-WAXD), contact angle measurements, and X-ray photoelectron spectroscopy (XPS). The impact of the carbamate linker was verified by comparison with poly[2-(perfluorooctyl)ethyl]acrylate (PFA-C8). PFAUr-C8 exhibited two phase transitions at 357 K and 416 K, whereas PFA-C8 showed a single-phase transition at 347 K. Both PFAUr-C8 and PFA-C8 formed a bilayered hexatic smectic-B phase at room temperature. Although the lamellar structure for the fluoroalkyl (Rf) groups was immediately lost in PFA-C8 after disordering of the lateral translational order, PFAUr-C8 maintained a stacked lamellar structure without lateral translational order. PFAUr-C8 exhibited excellent water repellency at room temperature similar to PFA-C8. The outstanding thermal stability of the lamellar structure in PFAUr-C8 is attributed to the cohesive interaction of the carbamate linkage.
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Acknowledgements
YL wishes to acknowledge the financial support from the China Scholarship Council (Grant Number 201608525036), Guizhou Science and Technical Foundation (Grant Number 20152124), Guizhou Oversea Talent Project (Qianren Xiangmu Zizhu Hetong Number 201414), and the Science Foundation of Guizhou Normal College (Guishiyuan Xiangmu Zizhu Hetong Number 14BS014). This work was supported by the Photon and Quantum Basic Research Coordinated Development Program of the Ministry of Education, Culture, Sports, Science and Technology, Japan. This work was supported by ImPACT Program of Council for Science, Technology, and Innovation (Cabinet Office, Government of Japan). This work was performed under the Cooperative Research Program “Network Joint Research Center for Materials and Devices”. This work was also supported by the MEXT Project “Integrated Research Consortium on Chemical Sciences.” The powder WAXD and GIXD experiments were performed at BL05XU, BL40B2, and BL03XU in SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Numbers 2017B1086 and 2018A1177). We gratefully acknowledge Dr. Kazuki Mita and Mr. Kiminori Uchida (Mitsui Chemicals, Inc.) for kindly giving us the opportunity to perform thin film WAXD measurements at the BL03XU. XPS measurement was performed at BL12 in the Kyushu Synchrotron Light Research Center (Proposal Number 1612115F and 1707063F).
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Liu, Y., Higaki, Y., Mukai, M. et al. Smectic ordered structure and water repellency of a poly(fluoroalkyl acrylate) with a carbamate linker. Polym J 51, 189–198 (2019). https://doi.org/10.1038/s41428-018-0139-2
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DOI: https://doi.org/10.1038/s41428-018-0139-2
