Filler network structure and crystallization behavior of polyvinylidene fluoride/graphene nanoplatelet composites using SEM, DSC, rheological, and in situ measurement approach. Issue 1 (20th December 2018)

• Record Type: Journal Article
• Authors: Shi, You; Yang, Bin; Miao, Ji‐Bin; Zheng, Zheng‐Zhi; Qian, Jia‐Sheng; Su, Li‐Fen; Cao, Ming; Xia, Ru; Chen, Peng; Liu, Jing‐Wang; Li, Gui‐Jing
• Is Part Of: Polymer crystallization. Volume 2:Issue 1(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-12-20
• Subjects: graphene nanoplatelets -- polyvinylidene fluoride -- rheological -- solution blending -- thermal properties; Crystalline polymers -- Periodicals; Crystallization -- Periodicals; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pcr2.10041
• Languages: English
• ISSNs: 2573-7619

Abstract

Abstract: In this work, solution blending was used to prepare series of polyvinylidene fluoride (PVDF)/graphene nanoplatelet (GNP) nanocomposites to investigate the effect of GNP content on the formation of filler network structure. Thermorheological complexity was observed with increasing GNP content, which was substantiated by morphological observation. Three classical thermal conduction models were adopted and compared with the measured thermal conductivity as a function of GNP loading, among which the Agari model presented the most reasonable prediction. A four‐parameter model was proposed to reflect the cooling behaviors of the PVDF/GNP composites with the aid of an in‐situ temperature measurement, suggesting the formation of GNP network structure in the composites. The incorporation of GNP showed an obvious nucleating effect on the crystallization of PVDF without altering its crystal form. Owing to the competition between spatial effect and heterogeneous nucleation, both crystallization rate and enthalpy achieved the maximum values when 6% GNP was added. Abstract : Four characteristic diffraction peaks are assigned to the diffractions of (100), (020), (110), and (021) crystal planes of the α‐form of PVDF. Despite the fact that the addition of GNP does not alter the crystal form of PVDF in the composites, as the filler content increased, the intensity of the (021) diffraction was remarkably enhanced with other crystal peaks nearly unchanged, suggesting a more perfect growth of the (021) crystal plane.