期刊
THIN-WALLED STRUCTURES
卷 155, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2020.106954
关键词
Aramid fabric; Body armours; Impact energy absorption; Rheological analysis; Shear thickening fluid
资金
- Defence Research and Development Organisation (DRDO), India [ST-13/TBR-1298]
The present work deals with synthesis and rheological characterisation of chemically modified polyethylene glycol (PEG) based novel shear thickening fluids (STFs) and their application to enhance impact resistance performance of p-aramid fabrics. The carrier fluid, i.e., PEG 200 was modified with citric acid and then modified PEG (M-PEG) was characterised by FTIR and NMR analysis which confirmed formation of ester link by reaction between PEG and citric acid. Mass distribution of M-PEG, analysed by MALDI-TOF, showed that either one or two PEG molecules reacted with one molecule of citric acid. A comparative thorough rheological analysis of M-STF and virgin STF showed significant increase in thickening behaviour in M-STF. The peak viscosity of M-STF increased 76 times while the critical shear rate decreased from 95.4 to 0.212 s(-1). Evidently, the chemical modification of PEG results in higher molar mass and higher number of hydrophilic functional groups, exhibiting better media-particle interaction by abundant H-bonding. Further, this media-particle interaction was studied by dynamic rheological analysis. As a consequence of enhanced dilatancy, impact resistance performance of M-STF treated para-aramid fabric improved by 30% with respect to that of virgin STF treated fabrics.
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