Cover Page October-2019-Advanced Materials Letters

Advanced Materials Letters

Volume 10, Issue 10, Pages 741-745, October 2019
About Cover

Wearable Health Devices are proving to be extremely helpful for people to keep a check on their health conditions. People can monitor their status at a fitness level and also at the proper medical level. With already a number of smart products in the market and the surge in the implementation IoT and AI in the healthcare sector, it is safe to say that the future lies in virtual healthcare and Wearable Health Devices. The cover photo of this October 2019 issue is inspired by the editorial article "Wearable Healthcare Devices", by Dr. Ashutosh Tiwari.


Critical Association Concentration of Dansyl-Poly (acrylic acid) Synthetized by Redox Polymerization Followed by an Esterification in Aqueous Solution: Spectrophotometric and Tensiometric Studies

Fateh Eltaboni1,* Abdelkader Imragaa1, Mansour Khuzkhaz1, Nada Ali1, Naziha Baayu

1Chemistry Department, Faculty of Science, University of Benghazi, Benghazi, Qar Yunis, Libya

Adv. Mater. Lett., 2019, 10 (10), pp 741-745

DOI: 10.5185/amlett.2019.0006

Publication Date (Web): May 10, 2019

E-mail: feltaboni@gmail.com  

Abstract

In the present work, the critical concentration for self-assembly of dansyl-polyacrylic acid (DANS-PAA) in aqueous solution has been characterized by a combination of spectrophotometric and tensiometric techniques, number average molar mass, degree of polymerization, and average number of bonds were also determined. The normalized absorbance value for DANS-PAA (10-4 wt%) as a function of PAA concentration was at maximum below a critical self-assembly concentration (CAC) of 0.0005 g·mL−1 and decreased dramatically with PAA concentration above this CAC. This supposes that upon adding more polymer, assembly occurs in a short concentration range about 0.0005 g·mL−1. Similarly, surface tension measurements for DANS-PAA decreased markedly with concentration after a threshold of around 0.0005 g·mL−1, above which it remained constant at ca. 20 dyne·cm−1. Consequently, the binary techniques produced an equivalent estimation of the CAC. Additionally, surface tension studies showed that the DANS-PAA polymer miscible with water caused surface tension to decrease by 49 % over a concentration range of 0 to 0.0014 g·mL−1, whereas marked reduction in surface tension (33 %) upon adding PAA, and slight decreasing (7%) was recorded upon adding acrylic acid monomer (AA) to water. © VBRI Press.

Keywords

Polyacrylic acid, dansyl-poly (acrylic acid), redox polymerization, absorbance, surface tension

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