Synthesis by In Situ‐Free Radical Polymerization, Characterization, and Properties of Poly (n‐butyl methacrylate)/Samarium‐Doped Titanium Dioxide Nanoparticles Composites

Abstract

Using free radical polymerization process a series of samarium-doped titanium dioxide (Sm 3+ -doped TiO 2 ) nanoparticles containing poly (n-butyl methacrylate) (PBMA) composites were synthesized. The fabricated samples were characterized by XPS, FTIR, UV, XRD, DSC, TGA, flame retardancy studies, and impedance analyser. The shift in FTIR peak of the nanocomposites to higher wavenumber indicates the interfacial interaction between nanoparticles and PBMA. The UV spectra indicated that the metal oxide nanoparticles could enhances the interfacial interaction in the polymer composites. SEM images showed the uniform dispersion of nanoparticles into the macromolecular chain of PBMA. XRD patterns of the composites indicated the ordered arrangement of nanoparticles within the polymer and the regularity of the chain improved by the increase in concentration of nanoparticles. Better flame resistance and thermal stability were attained by the addition of nanoparticles. The flame retardancy and thermal stability of the composites were improved with the increase in concentration of Sm 3+ -doped TiO 2 . The glass transition temperatures of the composites were much enhanced by the increase in weight percentage of nano-filler. The AC conductivity, dielectric constant and dielectric loss tangent of the composites were higher than the pure PBMA and these properties enhanced with the loading of nanoparticles up to 7 wt.% and thereafter the values decreases.

Adsorption mechanism of essence‐containing poly (butyl methacrylate) nanocapsules on cotton fabric surface

“…The thermogravimetric curve shows that the cotton treated with empty PBMA NCs starts to lose weight at approximately 150°C, with maximum weight loss at approximately 270°C. This is mainly attributed to the residual moisture in the PBMA NCs, the loss of the essence and Brij 21 emulsifier from the PBMA NCs, 63 and the homogeneous decomposition of vinyl in PBMA 64 . The second stage of weight loss can be observed at approximately 330°C, with maximum loss at approximately 380°C, which can be attributed to the decomposition of PBMA.…”

Chitin/Metal‐Organic Framework Composites as Wide‐Range Adsorbent

“…The embedding of MOF-808 within the CH matrix can induce (i) a disorder in the CH polymeric chains and (ii) CH chain -MOF-808 electrostatic interactions, both leading to a decrease the polymer relaxation dynamics. [60] Initial adsorption screening tests have been performed with CH, MOF-808, and CH/MOF-808 composites over cationic, anionic, and neutral pollutants with sizes ranging from nano-meter to the Ångstrom scales. To this end, CH/MOF-808 adsorption efficiency over aqueous solutions of lysozyme (LYS), gold nanoparticles (AuNP, 50 ppm), polymyxin B (POL-B), erythrosine (ERY, 50 ppm), methylene blue (MB, 50 ppm), methyl orange (MO, 50 ppm), Cr VI (50 ppm), and As V (40 ppm) has been quantified.…”

“…The tan δ peak shifts to lower frequencies upon the addition of MOF‐808, indicating a slowing‐down of the relaxation dynamics of CH chains. The embedding of MOF‐808 within the CH matrix can induce (i) a disorder in the CH polymeric chains and (ii) CH chain – MOF‐808 electrostatic interactions, both leading to a decrease the polymer relaxation dynamics [60] …”

Nanosized carbon black as synergist in PP/POE-MA/IFR system for simultaneously improving thermal, electrical and mechanical properties

“…LOI and UL-94 tests were firstly employed to evaluate the flame retardancy of PP samples, which are useful methods to analyze the combustion behavior of composite materials [29]. As listed in Table 3, it could be seen that the LOI value of neat PP was only 18.0%.…”