Gamma Radiation‐Induced Preparation of Polymeric Composite Sorbents and Their Structure Assignments

Sorption studies of neutral red dye onto poly(acrylamide‐co‐maleic acid)‐kaolinite/montmorillonite composites

“…Also there are absorption bands characteristic for SiOAl and SiO were observed at 799 and 1040 cm −1 , respectively, 32. The slight shift in the peaks positions in the IR spectrum may be because of the intercalation of montmorillonite and polymeric chains, which could be confirmed by XRD analysis and it agrees with previous work 11. The intercalation of polymeric chains into montmorillonite could be caused by the weak Van der Waals forces between the hydrated exchangeable cations and oxygen atoms of carbonyl groups.…”

“…Clay minerals, such as kaolinite,7, 8 montmorillonite,9–11 attapulgite,12 mica,13 bentonite, and sercite,14 have all been used for the preparation of polymer composites. The incorporation of these mineral powders can not only reduce production cost, but also improve the properties (such as swelling ability, gel strength, mechanical and thermal stability) of polymer and accelerate the generation of new materials for special applications 15.…”

Synthesis and evaluation of trimethylolpropane triacrylate crosslinked superabsorbent polymers for conserving water and fertilizers

“…The assignments of the prominent absorption peaks observed from the FTIR spectra of SAPs are shown in Table II. Analysis of this data39 indicated the presence of monomer and crosslinker moieties in the synthesized SAP. For an example the absorption peaks at 1730 and 1550 cm −1 in all the SAPs were attributed to the presence of >CO stretching of ester group (TMPTA), and carboxylate anion (KA), respectively.…”

Polymeric Composite Materials Based On Silicate; I-Synthesis, Characterization And Formation Mechanism

“…P(AM-AA), P(AM-AN), {P(AM-AA)-MgSi} and {P(AM-AN)-MgSi} composites were prepared as mentioned before in the experimental part by gamma radiation initiated co-polymerization of (AAM+AA), (AM+AN), (AM+AA+Mg+Si) and (AM+AN+Mg+Si) co-monomers at radiation doses 25, 65 and 90KGy. In gamma radiation initiated, the co-polymerization polymer complexes were formed which may be attributed to the possible steps [19]: preparation of the polymer by thegenerated radicals from the co-monomers, and the propagation of the co-monomer associated with the polymer by free radicals generated in the system [16,20]. The formationmechanism of P(AM-AA) copolymers can be represented as shown in scheme(2),when (AM+AA) comonomer subjected to gamma radiation, breaking down was carried out for double bond of (AM) and (AA) to form covalent bond between C atoms of (AM) and (AA), the polymerization in the chain occurred by addition polymerization [21].…”

“…For all investigation studies of the composites the rate of heating is 10°C/min [17,34,42,43], and the data were tabulated in Tables 1 and 2. Table 1and indicates the process was occurring via five stage process and the weight loss are continued up to 500 o C. The weight loss for P(AM-AA)and P(AM-AN) prepared at radiation doses 25, 65 and 90KGy with the heating temperature indicates that a (67.15%, 100% and 68.3%) for P(AM-AA) and (56.98%, 61.3% and 25.5%) for P(AM-AN) when the samplesare calcinated at 500 o C [19]. The DTA and TGA analyses for polymeric materials impregnated with inorganic ion exchange materials, {P(AM-AA)-MgSi} and {P(AM-AN)-MgSi} prepared at different radiation doses 25, 65 and 90 KGy were measuredand tabulated in Table 2.The data in Table 2 indicates that the process for {P(AM-AA)-MgSi} composite was occurring via four stage process at radiation doses 25 and 90KGy, where five stage process at radiation doses 65KGy.…”