Micromechanical and positron annihilation lifetime study of new cellulose esters with different topological structures

doi:10.1016/j.carbpol.2019.05.022

CORC > 化学研究所 > 中国科学院化学研究所

	Micromechanical and positron annihilation lifetime study of new cellulose esters with different topological structures
	Gaydarov, Valentin; Chen, Zhangyan; Zamfirova, Galina; Soylemez, Meshude Akbulut; Zhang, Jinming; Djourelov, Nikolay; Zhang, Jun
刊名	CARBOHYDRATE POLYMERS
	2019-09-01
卷号	219 页码:56-62
ISSN号	0144-8617
DOI	10.1016/j.carbpol.2019.05.022
英文摘要	Two new groups of cellulose esters with a substituent, either trifluoromethylbenzoate or methylbenzoate, were synthesized in homogeneous conditions. The actual presence of aromatic substituents was demonstrated by H-1-NMR spectra. The mechanical and structural peculiarities were determined by Depth Sensing Indentation (DSI) and Positron Annihilation Lifetime Spectroscopy (PALS) techniques. The relative position of CH3 and CF3 groups on the aromatic substituents influences the molecular packing differently and affects the formation of free volumes. The hardness characteristics and modulus of the corresponding cellulose esters were the lowest when the CH3 and CF3 groups are in m-position on the aromatic substituents. Meanwhile, they exhibited the highest number density of the free volume holes, as revealed by the o-Ps intensity values. An inverse linear relationship between the hardness, respectively on the modulus, and the o-Ps intensity was found. A simplified scheme of the structural feature of the investigated cellulose esters was proposed.
语种	英语
WOS记录号	WOS:000469334500007
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/82621]
专题	中国科学院化学研究所
作者单位	Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Gaydarov, Valentin,Chen, Zhangyan,Zamfirova, Galina,et al. Micromechanical and positron annihilation lifetime study of new cellulose esters with different topological structures[J]. CARBOHYDRATE POLYMERS,2019,219:56-62.
APA	Gaydarov, Valentin.,Chen, Zhangyan.,Zamfirova, Galina.,Soylemez, Meshude Akbulut.,Zhang, Jinming.,...&Zhang, Jun.(2019).Micromechanical and positron annihilation lifetime study of new cellulose esters with different topological structures.CARBOHYDRATE POLYMERS,219,56-62.
MLA	Gaydarov, Valentin,et al."Micromechanical and positron annihilation lifetime study of new cellulose esters with different topological structures".CARBOHYDRATE POLYMERS 219(2019):56-62.