Confinement effect of SiO2 framework on phase change of PEG in   shape-stabilized PEG/SiO2 composites

doi:10.1016/j.eurpolymj.2012.01.016

CORC > 北京大学 > 化学与分子工程学院

	Confinement effect of SiO2 framework on phase change of PEG in shape-stabilized PEG/SiO2 composites
	Yang, Huazhe ; Feng, Lili ; Wang, Chongyun ; Zhao, Wei ; Li, Xingguo
刊名	欧洲聚合物杂志
	2012
关键词	Polyethylene glycol Shape-stabilized phase change materials Confinement effect PEG/SiO2 composites THERMAL-ENERGY STORAGE POLY(ETHYLENE OXIDE) CRYSTALLIZATION POLYETHYLENE METASTABILITY PERFORMANCE POLYMERS BEHAVIOR
DOI	10.1016/j.eurpolymj.2012.01.016
英文摘要	PEG/SiO2 shape-stabilized phase change materials with various mass fractions and molecular weights of PEG were prepared by the sol-gel method. Polyethylene glycol (PEG) and tetraethyl orthosilicate (TEOS) were chosen as the phase change substance and the silica framework precursor, respectively. The as-prepared samples were characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC). Fourier transform infrared (FTIR) spectroscopy and scanning electron microscope (SEM) techniques. It is shown that the silica framework strongly confined the crystallization of PEG. The crystallinity and thermodynamic performance of the composites were undesirable for PEG with molecular weight of 1500 even when the PEG content reached 80 wt%. The crystallinity and thermodynamic performances of the PEG/SiO2 composites first decline then improve with the increase of the PEG molecular weights, owing to the different confinement behaviors of the silica framework. Finally, we investigated the phase change mechanism of the PEG/SiO2 composites under the different confinement of the silica framework. (C) 2012 Elsevier Ltd. All rights reserved.; Polymer Science; SCI(E); EI; 0; ARTICLE; 4; 803-810; 48
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/150933]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Yang, Huazhe,Feng, Lili,Wang, Chongyun,et al. Confinement effect of SiO2 framework on phase change of PEG in shape-stabilized PEG/SiO2 composites[J]. 欧洲聚合物杂志,2012.
APA	Yang, Huazhe,Feng, Lili,Wang, Chongyun,Zhao, Wei,&Li, Xingguo.(2012).Confinement effect of SiO2 framework on phase change of PEG in shape-stabilized PEG/SiO2 composites.欧洲聚合物杂志.
MLA	Yang, Huazhe,et al."Confinement effect of SiO2 framework on phase change of PEG in shape-stabilized PEG/SiO2 composites".欧洲聚合物杂志 (2012).