Abstract
Shape recovery of a droplet of liquid crystalline polymer (LCP) hydroxypropylcellulose in a matrix of poly(dimethyl siloxane) subjected to a step shear strain has been studied via optical microscopy. Just after application of a large strain, the LCP droplet shape is flat ellipsoid, and then the droplet takes cylindrical shape and band texture perpendicular to the flow direction appears. The band texture fades away before emergence of poly-domain structure. In the final process with the shape of spheroid, poly-domain structure recovers very slowly. Except for the final process, the shape change is identical with that of isotropic droplet at strains smaller than 3, when the LCP viscosity in Region II is taken as an equivalent viscosity for normalization. For a 20:80 blend, the excess relaxation modulus is calculated based on the Doi-Ohta theory, taking account of the distribution of droplet size and compared with experimental modulus data.
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Acknowledgment
This work was supported by a Grant-in-Aid for Scientific Research (B) No. 16350127 and No. 18350119 from the Japan Society for the Promotion of Science (JSPS) and by a Grant-in-Aid for JSPS Fellows No. 15-03299 from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Paulo H. P. Macaúbas is on leave from Department of Metallurgical and Materials Engineering, Escola Politécnica, São Paulo University, Av. Prof. Mello Moraes, 2463, CEP 05508-900, São Paulo-SP, Brazil.
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Macaúbas, P.H.P., Kawamoto, H., Takahashi, M. et al. Shape and structure recovery of an LCP droplet under a large step strain: observation and stress calculation. Rheol Acta 46, 921–932 (2007). https://doi.org/10.1007/s00397-007-0175-x
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DOI: https://doi.org/10.1007/s00397-007-0175-x