The Effect Hydrophilic/Hydrophobic Interaction of 2-((Dimethylamino)methyl)-4-formyl-6 methoxyphenyl Acrylate and 4-Acet
- PDF / 2,564,140 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 54 Downloads / 153 Views
ORIGINAL PAPER
The Effect Hydrophilic/Hydrophobic Interaction of 2‑((Dimethylamino) methyl)‑4‑formyl‑6 methoxyphenyl Acrylate and 4‑Acetylphenyl Acrylate Monomers on the Phase Transition Temperature of N‑isopropylacrylamide Terpolymers Momen S. A. Abdelaty1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract To achieve functional polymer with thermo-pH responsivity, new functional monomers have been prepared. One is based on vanillin as a renewable material of 2-((dimethylamino)methyl)-4-formyl-6-methoxyphenyl acrylate (DMAMVA), and the other based on 4-hydroxyacetophenone 4-acetylphenyl acrylate (APA). The new monomers were evaluated with 1H, 13 C NMR, FTIR, and UV. The next step was focused on preparing a new series of thermo-pH functional polymer with three different molar concentrations of DMAMVA and one molar concentration of APA; they were evaluated by 1H NMR and FTIR. The effect of hydrophilic/hydrophobic groups based on the new monomers on the phase separation and the lower critical solution temperature of N-isopropylacrylamide has been investigated using two methods; the turbidity method by UV–Vis spectroscopy in which the change in transmittance has been taken with the temperature of the polymer solution. On the other hand, micro-DSC was used to recode the transition temperature at the onset value of the thermogram. Moreover, polymers have been fully investigated by GPC for molecular weight, DSC for glass temperature, XRD for the degree of crystallinity and SEM for surface morphological features. This study will be progressed in the future as the preparation of post-polymerization and formation of hydrogel for targeting biomolecules and their responsivity to both temperature and pH.
* Momen S. A. Abdelaty [email protected] 1
Polymer Lap, Chemistry Department, Faculty of Science (Assiut), Al-Azhar University, Assiut 71524, Egypt
13
Vol.:(0123456789)
Journal of Polymers and the Environment
Graphic Abstract
Keywords pH-functional · Hydrophilic/hydrophobic · Phase transition temperature · N-isopropylacrylamide
Introduction In the last decades, the importance of responsive, environmental, stimuli and intelligent polymeric material has a great interest in scientific research as well as the industrial field [1–6]. The sensitivity of the polymer solution to temperature is responsible for producing thermo-responsive polymer; it has two forms depending on the temperature of the phase separation. The most popular one is the lower critical solution temperature (LCST) that the polymer solution appears clear and miscible (one phase) before transition temperature, while turbid and immiscible (two-phase) by raising the temperature above the transition temperature [7]. On the otherwise, when the polymer solution separated and turbid (two-phase) at a lower temperature and appears clear by raising the temperature (one phase); it is known as the upper critical solution (UCST) [8, 9]. This behavior of the polymer solution has been interpreted according to the thermodynamic t
Data Loading...
