Methacrylate copolymers and their composites with nano-CdS: synthesis, characterization, thermal behavior, and antimicrobial properties

Abstract

Homo-and copolymers of 2-(N-phthalimido)ethyl methacrylate (NPEMA) and p-chlorophenyl methacrylate (PCPMA) were prepared in N,N-dimethyl formamide (DMF) solution at 70 °C using 2,2-azo-bisisobutyronitrile (AIBN) as initiator. The nano-CdS-doped polymer composite of NPEMA and PCPMA was prepared via in situ technique. The homo-and copolymers of NPEMA and PCPMA were characterized using FT-IR spectroscopy and gel permeation chromatography (GPC). The polymer nano composites were characterized using FT-IR spectroscopy, X-ray diffraction, and transmission electron microscopy. The reactivity ratios (r 1 and r 2) were obtained from the various linear graphical methods. The values of r 1 (NPEMA) = 0.55 and r 2 (PCPMA) = 1.30 were found from the same graphical methods. The copolymer microstructures were found from the mean sequence length, run number, and dyad fraction. Thermal behavior of polymers and polymer nano composites under nitrogen atmosphere was studied. The activation energies of neat polymers were varied in the range of 56-85 kJ/mol, while 28-56 kJ/mol energies were found for nano-CdS-doped polymer composites. The thermodynamic parameters of thermal degradation were also obtained. Kinetic and thermodynamic parameters were confirming the stability of the neat polymers than polymer nano composites. The polymers were assessed on different microorganisms for obtaining the antimicrobial properties. Overall, the polymers permit 10-52, 20-58, and 18-56% growth of bacteria, fungi, and yeast, respectively.

Universal approach of cellulose fibres chemical modification result analysis via commonly used techniques

“…Activation energies of thermal decomposition steps have been established with Broido [50] and Coats [51] methods as it has been shown in various researches [52][53][54]. Obtained values are in well correspondence and are confirmed in the literature [55].…”

Study on CO2 facilitated separation of mixed matrix membranes containing surface modified MWCNTs

“…The activation energy was 79.29, 78.21, 77.71, and 77.0 KJ•mol −1 for VA‐co‐VAm/MWCNT‐NH 2 , VA‐co‐VAm/MWCNT‐OH, VA‐co‐VAm/MWCNT, and VA‐co‐VAm, respectively. The higher Ea of the MMMs suggested that the MMMs possessed better thermal stability than pristine membrane material . This feature also can be attributed to two possible reasons.…”

“…It has been found that the addition of nanofiller may affect the thermal stability of membranes due to the interaction between inorganic nanofiller and polymeric matrix . The addition of MWCNTs slightly increased the thermal resistance of the membranes.…”

“…These phenomena indicate that the addition of inorganic nanofillers can effectively reduce the crystallinity of polymer, which was helpful for the gas permeation. In addition, the crystallization property can also be qualitatively investigated by the DSC testing . The melt enthalpy of crystal region, which represented the crystallinity of polymer, was obtained from the integral of crystal endothermic area and listed in Table .…”

Modification and acidification of polysulfone as effective strategies to enhance adsorptive ability of chromium (VI) and separation properties of ultrafiltration membrane

“…The activation energies of thermal degradation were obtained using Briodo (BR) 31 and shown in Table 1. The activation energy of PSF membrane was highest, along with the most demand of energy for degradation of polysulfone backbone.…”