TY - JOUR
T1 - Crystallization-induced structure fluctuation of crystallized microdomain structure composed of strongly segregated crystalline-crystalline diblock copolymers
AU - Nojima, Shiki
AU - Higaki, Yuji
AU - Ishige, Ryohei
AU - Kabayama, Hirofumi
AU - Ohta, Noboru
AU - Masunaga, Hiroyasu
AU - Hirai, Tomoyasu
AU - Kojio, Ken
AU - Takahara, Atsushi
N1 - Funding Information:
The synchrotron radiation, the high-resolution powder WAXD and in-situ time-resolved simultaneous SAXS/WAXD measurements were performed at BL02B2 and BL40B2 in SPring-8 with the approval of Japan Synchrotron Radiation Institute (JASRI, proposal number 2013A1453, 2014B1776 and 2015A1396). This work was partially supported by the Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan. This work was supported by the Impulsing Paradigm Change through Disruptive Technology (ImPACT) Program. S.N. acknowledges the financial support of a Grant-in-Aid for JSPS Fellows (No. 16J06893 ). We gratefully acknowledge Dr Masamichi Morita (Daikin Industries Ltd) for the generous gift of FA-C 8 monomer.
Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/10/12
Y1 - 2016/10/12
N2 - Crystallization-induced structure fluctuations in the layer thickness direction and disordering of pre-crystallized structure in crystallized microdomain structure that consist of a strongly segregated crystalline-crystalline diblock copolymer, poly(ethylene glycol)-block-poly(perfluorooctyl ethyl acrylate) (PEG-b-PFA-C8), were investigated. The structure formation process during isothermal crystallization was monitored by in-situ time-resolved simultaneous SAXS/WAXD measurements and thermal analysis. At early stage of isothermal crystallization, three dimensional growth of the PEG lamellar crystals within lamellar microphase-separated morphology induced the volume shrinkage of PEG phase, resulting in the reduction of PEG layer thickness, increase of PFA-C8 layer thickness and disordering of pre-crystallized PFA-C8 crystals. At late stage of isothermal crystallization, one dimensional growth, thickening of PEG lamellar crystals induced the increase of PEG layer thickness and reduction of PFA-C8 layer thickness. The structure fluctuation in the crystallized microdomain structure depends on the crystal growth dimension.
AB - Crystallization-induced structure fluctuations in the layer thickness direction and disordering of pre-crystallized structure in crystallized microdomain structure that consist of a strongly segregated crystalline-crystalline diblock copolymer, poly(ethylene glycol)-block-poly(perfluorooctyl ethyl acrylate) (PEG-b-PFA-C8), were investigated. The structure formation process during isothermal crystallization was monitored by in-situ time-resolved simultaneous SAXS/WAXD measurements and thermal analysis. At early stage of isothermal crystallization, three dimensional growth of the PEG lamellar crystals within lamellar microphase-separated morphology induced the volume shrinkage of PEG phase, resulting in the reduction of PEG layer thickness, increase of PFA-C8 layer thickness and disordering of pre-crystallized PFA-C8 crystals. At late stage of isothermal crystallization, one dimensional growth, thickening of PEG lamellar crystals induced the increase of PEG layer thickness and reduction of PFA-C8 layer thickness. The structure fluctuation in the crystallized microdomain structure depends on the crystal growth dimension.
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U2 - 10.1016/j.polymer.2016.09.024
DO - 10.1016/j.polymer.2016.09.024
M3 - Article
AN - SCOPUS:84988328555
SN - 0032-3861
VL - 102
SP - 256
EP - 265
JO - polymer
JF - polymer
ER -