Fullerene-induced crystallization toward improved mechanical properties of solvent casting polycarbonate films
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Fullerene‑induced crystallization toward improved mechanical properties of solvent casting polycarbonate films Yukai Su1 · Shiya Ran2 · Zhengping Fang2 · Zhenghong Guo2 Received: 15 January 2020 / Accepted: 16 March 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This work provides a facile strategy to induce crystallization of polycarbonate (PC) through solvent casting method. Pristine fullerene (C60) and PC-modified C60 nanoparticles are applied as nucleating agents for PC, and the crystallization behavior of PC nanocomposite films is controlled by solvent casting preparation conditions. To investigate the relationship between crystallization behavior and mechanical properties of PC nanocomposite films, X-ray diffraction, differential scanning calorimetry, polarizing microscope and tensile tests are carried out. Pristine C60 can only induce the formation of bulk PC spherocrystals which have no help or even deteriorates the mechanical properties of PC/C60 nanocomposite films. By contrast, the PC-modified C60 achieves uniformly disperse in the matrix and induces the formation of microcrystalline structures. It is found that appropriate degree of crystallinity for the PC/modified C 60 nanocomposite films can effectively improve the mechanical properties. Typically, the PC/0.50 wt%-modified C 60 nanocomposite films prepared under 40 °C by tetrahydrofuran exhibits up to a 33% increment in tensile strength and 45% increment in Young’s modulus compared to neat PC films. Keywords Nanocomposite · Fullerene · Mechanical properties · Crystallization
1 Introduction As a sort of important commercial engineering thermoplastic, bisphenol-A polycarbonate (PC) possesses several desirable features such as optical transparency, dimensional stability, excellent mechanical and thermal properties [1]. Vehicular devices, airplane windows, electrical components, safety helmets, PC products can be seen everywhere. Owing to the rigid backbone, PC chains are not easy to crystalize, thus PC is usually used as an amorphous polymer material. A lot of research has proved that the crystallization behavior of polymers impacts their properties greatly, and the mechanical properties of engineering plastics are closely bound up with their practical applications. So far, very limited number of researches have referred to this aspect for PC. * Zhenghong Guo [email protected] 1
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Institute of Polymer Composites, Zhejiang University, Hangzhou 310027, China
Laboratory of Polymer Materials and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
2
Few papers revealed that the increment in crystallinity of PC could improve its storage modulus and Young’s modulus [2–4]. Hareesh et al. [5] reported that UV-irradiation was able to cause carbonate bond breakage and lead to crystallinity decrease for PC, the degradation and reduction in crystallinity could cause the decrement in tensile strength, percen
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