The mechanical properties, crystallization and rheological behavior of isotactic polypropylene with nucleating agent sup
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ORIGINAL PAPER
The mechanical properties, crystallization and rheological behavior of isotactic polypropylene with nucleating agent supported on polyhedral oligomeric silsesquioxanes (POSS) Xian Zhang 1 & Shicheng Zhao 1 & Xin Meng 1 & Zhong Xin 1 Received: 28 April 2020 / Accepted: 17 August 2020 # The Polymer Society, Taipei 2020
Abstract The influence of the nucleating agent that supported on polyhedral oligomeric silsesquioxanes (supported NA) on the properties of iPP was investigated in detail. It was found that the supported NA have higher nucleating efficiency than the original NA powder in the iPP system. The flexural modulus of iPP increased by 11.6% with 0.04 wt.% original NA powder and increased by 20.5% when supported NA added. The sizes of supported NA were investigated by scanning electron microscope (SEM) coupled with energy dispersive spectrometer (EDS). The crystal structure and morphology of the iPP samples was studied using wideangle X-ray diffraction (WAXD) and polarized optical microscope (POM), respectively. The nucleating efficiency of supported NA and the dry mix of NA and POSS was also analyzed. The non-isothermal crystallization behaviors were analyzed using Mo’s model. Besides, the sample with supported NA exhibited lower complex viscosity (η*) values, indicting supported NA can act as a lubricant in system. A possible crystallization mechanism of supported NA in the iPP was proposed. Keywords Polyhedral oligomeric silsesquioxanes . Isotactic polypropylene . Supported-nucleating agent . Nucleating efficiency
Introduction Isotactic polypropylene (iPP) is extensively used in many fields owing to its relatively low manufacturing cost and versatile properties [1, 2]. Its properties depend largely on crystallization behavior and crystal structure [3–5]. The addition of nucleating agent (NA) can effectively modify the crystal structure and accelerate crystallization process of iPP, resulting in the improved mechanical properties and processability [6–8]. However, for the NA that insensitive to the melt, its dispersion in iPP is the usual problem because of the large chemical polarity gap between iPP and NA, which would undoubtedly
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10965-020-02260-9) contains supplementary material, which is available to authorized users. * Zhong Xin [email protected] 1
Department of Product Engineering, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
reduce its nucleating efficiency [9, 10]. So far, it is still a challenge to achieve well-dispersion of the NA. Many studies have been conducted on the problem, such as in-situ polymerization [11–14], self-dispersed nucleating agents [9] and reducing sizes of NA directly [15, 16], and so on. Among them, directly reducing the sizes of NA could cause a more serious agglomeration due to the increase of surface energy of NA. Supporting the NA on a support mi
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