Spectroscopic Studies of Poly(ε-Caprolactone)/Sodium Montmorillonite Nanocomposites

Abstract

Polymer-layered silicate nanocomposites belong to a new class of hybrid materials consisting of organic-synthetic polymer matrix and inorganic filler--layered structure clay minerals. The paper presents the results of FTIR, NMR, and SAXS studies of poly(ε-caprolactone)/sodium montmorillonite nanocomposites. We observed a correlation between the concentration of poly(ε-caprolactone) in nanocomposite samples and structural changes both of the clay mineral and the intercalated polymer. Stiffening of the clay structure appears as a result of poly(ε-caprolactone) intercalation into a clay structure.27 Al NMR studies indicated in nanocomposites two non--equivalent sites of aluminium ions, i.e. in octahedral and tetrahedral coordination, whereas in the montmorillonite clay structure the aluminium ions are located in the interlayer space too. We found also that the temperatures of structural changes and softening process of poly(ε-caprolactone) chains in the nanocomposites depend on the concentration of poly(ε-caprolactone).

Preparation of 0.7SiO2·0.3CaO/PCL hybrid layers via sol–gel dip coating for the surface modification of titanium implants: characterization, bioactivity and biocompatibility evaluation

“…The polymer signals are overlapped with the strong bands typical of the inorganic matrix and therefore are visible only when high PCL amount has been added in the synthesis. Generally, the carbonyl bond gives a signal at 1730 cm -1 in the spectrum of the pure PCL [38,39]. Its shift to lower wave numbers, together with the shape change of the broadband at 3440 cm -1 , characteristic of O-H groups, suggests the existence of hydrogen bonds between the C=O of the polymer and the -OH groups of the inorganic component.…”

The thermal and structural analysis of new bicomponent binders for moulding sands consisting of furfuryl resin and polycaprolactone (PCL)

“…Band at 1470 cm -1 refers to the asymmetrical vibration of C-H of a methylene group [15]. The remaining bands in the 1470-1369 cm -1 and 1105-730 cm -1 are also in the vibration characteristic of C-H bond [15,[17][18][19]. In the wave number range 1297-1160 oscillation of C-O bonds occurs [15][16][17][18].…”

“…In the wave number range 1297-1160 oscillation of C-O bonds occurs [15][16][17][18]. [18][19] 1297 ν cr (C-O)andν cr (C-C)stretching in the crystalline phase [16][17][18] 1240 ν as (C-O-C) asymetric stretching [15][16][17] (C = C) [27] 1358 (OH) vibrations of the furan ring or of the OH phenolic deforming the bond along the plane [22][23] 1220, 1148, 1008 Band recognized in cured resin [22] 914, 885, 814 (C-H) deforming vibrations of the furan ring [21] 745 skeleton vibrations coming from bonds found in furfuryl alcohol [21] 599 vibrations of the entire furan ring [21] [18][19]. There has also been a growth of intensity for band at wavenumber 1730 cm -1 caused by vibration of extending carbonyl bond C = O with the increasing addition of PCL [26].…”

Production and Structural Investigation of Polyethylene Composites with Modified Kaolin

“…Kaolins are activated by modification with the coupling agents improving the adhesion between the filler and the polymer. The modification enhances the interphase connection [6][7][8][9][10][11]. The formation of chemical bonds between the polymer and the filler is responsible for improved mechanical properties of the composites [6][7][8][9][10][11].…”

“…The modification enhances the interphase connection [6][7][8][9][10][11]. The formation of chemical bonds between the polymer and the filler is responsible for improved mechanical properties of the composites [6][7][8][9][10][11]. The choice of the coupling agent is of crucial importance; it has to contain the functional groups capable of forming bonds with the filler and with the polymer matrix [7][8][9][10][11][12][13].…”