In⁃situ Study of the Epitaxial Crystallization of PCL/RGO at High Shear Rate

doi:10.7503/cjcu20200493

Abstract

Abstract:

Polycaprolactone（PCL）/reduced graphene oxide（RGO） composites were used as the research object to study the evolution of the epitaxial crystalline structure and the influence on the formation of bulk crystal at the shear rate of 75 s^?1 by in?situ small-angle X-ray scattering（SAXS） and wide-angle X-ray diffraction（WAXD） in this paper. The experimental results show that PCL molecular chains start to form epitaxial crystal layer on the RGO surface at 160 s after shear， and part of PCL bulk crystal is formed simultaneously. In the isothermal crystallization stage（200―480 s after shear）， a large number of PCL bulk crystals are formed， which promotes the formation of regular periodic structure. The PCL molecular chain is more likely to change from the extensional chain to the random coil at a higher shear temperature because of the reduced viscosity at 75 s^?1， which is not beneficial for PCL molecular chain to form surface crystal layer on RGO. The shear tempe-rature of 70 ℃ is more favorable for the formation of PCL epitaxial crystal layer on the RGO at shear rate of 75 s^?1.

Key words: Polycaprolactone, Reduced graphene oxide, Epitaxial crystallization, High rate shear field

CLC Number:

O631

TrendMD:

MIAO Weijun, WU Feng, WANG Yong, WANG Zongbao. In⁃situ Study of the Epitaxial Crystallization of PCL/RGO at High Shear Rate[J]. Chem. J. Chinese Universities, 2021, 42(3): 910.

Figures/Tables 10

References 35

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