Investigation on Structural, Morphological and Relaxometric Properties of Lamellar Zrp Modified with Long Chain Amine

Abstract

In order to search nanofiller for controlling release of drugs lamellar α-zirconium phosphate (α-ZrP) was modified with ether-amine oligomer (E-A). Synthesis and chemical modification followed specific reaction conditions and different EA:ZrP ratios. Infrared spectra showed strong interaction between P-OH and NH 2 groups. Thermogravimetric curves showed that ether-amine oligomer was incorporated by ZrP. Interlamellar space of α-ZrP increased at least four times indicating intercalation. The relaxometry analysis indicated that α-ZrP molecular mobility changed according to the etheramine amount. The scanning electron microscopy/energy dispersive analysis revealed the presence of octadecylamine inside the α-ZrP galleries. The results showed that P-OH group (Brønsted acid) and amine group (Brønsted base) reacted to each other, resulting in an ionic bond PO-+ 3 HN-[-(CH 2-CH 2-O) m-(CH 2-C-H(CH 3)-O) n-]. Partially intercalated nanofiller were achieved.

Nano lamellar zirconium phosphate and screw speed changing properties of melt extrusion polypropylene nanocomposites

“…In both ranges, the PP absorptions were clearly noticed and in agreement with the reported by Carvalho et al and Hummel and Scholl [33][34]. The absorptions at 3595 and 3511 cm À1 were concerned with the asymmetric and symmetric stretching of P-OH group/water hydrogen bonds in the crystalline arrangement in the phosphate interlamellar region as registered elsewhere 27. Due to their low intensity did not appear in the nanocomposites.…”

“…[33][34] The absorptions at 3595 and 3511 cm À1 were concerned with the asymmetric and symmetric stretching of P-OH group/water hydrogen bonds in the crystalline arrangement in the phosphate interlamellar region as registered elsewhere. 27 Due to their low intensity did not appear in the nanocomposites. For the nanocomposites, ordinary absorptions were observed at around 3000-2800 cm À1 associated with the C-H asymmetric and symmetric stretching of CH 3 and CH 2 groups attached to the PP chains and Jeffamine TM .…”

“…The synthesis of nano lamellar zirconium phosphate was performed by direct precipitation. [26][27][28] Phosphoric acid aqueous solution (12 M) and zirconium oxychloride one (Zr/P ¼ 18) were added into round bottom glass flask, kept under reflux at 110 C and stirring, for 24 hours. The reaction medium was centrifuged at 3000 rpm (NT810 model), and the solid portion was washed successively until pH 5.…”

“…Table 2 illustrates the diffraction angle and interlamellar distance (d spacing ) of the nanocomposites. To support the influence of phosphates and screw speed, the phosphate crystallographic data (single and modified) published elsewhere 27 were added in Table 2. For all nanocomposites, PP 2h diffraction peaks appeared around 14.2 (110), 16.98 (040), 18.62 (130) and 21.9 (111) associated with the a-monoclinic crystalline arrangement as reported by Mariano et al and Bafana et al 28,38 Independent on the screw speed, for the PP/ZrP nanocomposite, the ZrP diffraction angle [38][39] showed a slight shift to a low value and a feeble increase of d spacing , meaning much low PP intercalation inside the phosphate galleries.…”

Poly(ethylene terephthalate)/titanium phosphate nanocomposites: Effect of fillers on thermal, crystallographic diffraction, molecular mobility, and UV-Vis absorption

“…Extensively studied zirconium and titanium phosphates (TiPs) possess peculiar lamellar crystalline arrangements allowing intercalation with short-and long-chain amines. [6][7][8][9][10][11][12][13] Uryupina and coauthors investigated the influence of TiP on stability of epoxy resin suspension. They mentioned the increase of suspension stability owing to the formation of the adsorption shell on nanoparticles.…”