ICCAS OpenIR
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
2019-09-01
Source PublicationCARBOHYDRATE POLYMERS
ISSN0144-8617
Volume219Pages:56-62
AbstractTwo 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.
DOI10.1016/j.carbpol.2019.05.022
Indexed BySCI
Language英语
WOS IDWOS:000469334500007
EI Accession Number1879-1344
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82621
Collection中国科学院化学研究所
AffiliationChinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
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.
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