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NON-ISOTHERMAL CRYSTALLIZATION OF ethylene-vinyl acetate COPOLYMER CONTAINING A HIGH WEIGHT FRACTION OF GRAPHENE NANOSHEETS AND CARBON NANOTUBES

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Chinese Journal of Polymer Science 2012年第6期30卷 879-892页

作者：李忠明陈晨 College of Polymer Science and Engineering and State Key Laboratory of Polymer Materials Engineering Sichuan University Analytical and Testing Center Sichuan University

The effect of the different geometrical dimensionality of two dimensional graphene nanosheets （2D GNSs） and one dimensional carbon nanotubes （1D CNTs） on the non-isothermal crystallization of an ethylene-vinyl acetate （EVA） copolymer at high loading （5 wt%） was studied. Transmission electron microscopy indicated a homogeneous dispersion of GNSs and CNTs in EVA obtained by a solution dispersion process. Fourier-transform infrared spectroscopy and differential scanning calorimetry measurements showed that 1D CNTs and 2D GNSs acted as effective nucleating agents, with a noticeably increased onset crystallization temperature of EVA. A high weight fraction of nano-fillers slowed the overall crystallization rate of composites. At the same crystallization temperatute, the crystallization behavior of GNS/EVA composites was slowed compared to that of the CNT/EVA ones owing to larger nucleus barrier and activation energy of diffusion. Dynamic mechanical relaxation and rheology behavior of CNT/EVA and GNS/EVA composites demonstrated that the planar structure of the GNSs had an intensively negative effect on EVA chain mobility due to interactions between nano- fillers and polymer chains, as well as spatial restriction.

关键词： Non-isothermal crystallization ethylene-vinyl acetate Graphene nanosheet Carbon nanotube.

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Photovoltaic efficiency enhancement of polycrystalline silicon solar cells by a highly stable luminescent film

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Science China Materials 2020年第4期63卷 544-551页

作者： Yuan Wang Paula Gawryszewska-Wilczynsk Xiurong Zhang Jian Yin Yongqing Wen Huanrong Li School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300130China Faculty of Chemistry University of Wroclaw14F.Joliot-Curie Str.50-383 WroclawPoland Tianjin Baogang Research Institute of Rare Earths Co. Ltd.Tianjin 300300China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou 014030China

Si-based solar cells have dominated the entire photovoltaic market,but remain suffering from low power conversion efficiency(PCE),partly because of the poor utilization of ultraviolet(UV)***(III)(Eu^3+)complexes with organic ligands are capable of converting UV light into strong visible light,which makes them ideal light converter to increase the efficiency of solar ***,the low stability of such complexes seriously hampers their practical *** this work,we report a highly stable and luminescent ethylene-vinyl acetate(EVA)copolymer film consisting of a Eu^3+complex as a down-shift material,Eu(ND)4 CTAC(ND=4-hydroxy-2-methyl-1,5-naphthyridine-3-carbonitrile,CTAC=hexadecyl trimethyl ammonium chloride),coating of which onto the surface of large area polycrystalline silicon solar cells(active area:110 cm^2)results in an increase of PCE from 15.06%to 15.57%.Remarkable stability of the luminescent film was also demonstrated under lightsoaking test for 500 h,and no obvious luminescence degradation can be *** remarkable enhancement of the conversion efficiency by 0.51%absolute on such a large active area,together with the high stability of the luminescent film,demonstrates a prospect for the implementation of the films in photovoltaic industry.

关键词： ethylene-vinyl acetate lanthanide complexes solar cell stability

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改性蒙脱土/EVA纳米复合材料的制备及阻燃性能

改性蒙脱土/EVA纳米复合材料的制备及阻燃性能

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2012年全国高分子材料科学与工程研讨会

作者：刘妍张艳方征平高分子合成与功能构造教育部重点实验室浙江大学高分子科学与工程学系浙江大学宁波理工学院高分子材料与工程研究所

＜正＞蒙脱土（MMT）与阻燃剂复配阻燃高分子材料的研究近年来非常活跃。用阻燃剂对MMT进行有机化处理不仅能改善MMT在聚合物基体中的分散性,而且能使MMT和阻燃剂更好地发挥协同效应,有利于材料阻燃性能的提高。本文通过用自制的聚膦酸... 详细信息

＜正＞蒙脱土（MMT）与阻燃剂复配阻燃高分子材料的研究近年来非常活跃。用阻燃剂对MMT进行有机化处理不仅能改善MMT在聚合物基体中的分散性,而且能使MMT和阻燃剂更好地发挥协同效应,有利于材料阻燃性能的提高。本文通过用自制的聚膦酸酯类膨胀型

关键词： polyphosphonate montmorillonite nanocomposite ethylene-vinyl acetate

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