Synthesis and Characterization of Modified Cellulose Acetate Propionate Nanocomposites via Sol-Gel Process

Abstract

In this study novel organic-inorganic hybrid nanocomposites were synthesized from modified cellulose acetate propionate (MCAP) via sol-gel reaction at ambient temperature. The inorganic phase was introduced in situ by hydrolysis-condensation of tetraethoxysilane (TEOS) in different concentrations, under acid catalysis, in the presence of organic polymer dissolved in acetone. The chemical modification of CAP was monitored by infrared spectroscopy (IR). The nanocomposites structure was characterized by IR analysis and solid state29Si NMR studies. The spectral data revealed that organic and inorganic phases are linked through covalent bound. Surface morphology of the samples and the degree of dispersion of inorganic phase in the polymer matrix were investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The actual incorporation of the inorganic component into the hybrid nanocomposites was deducted from the residual weight according to thermogravimetric analysis (TGA).

Improving Structural Homogeneity, Hydraulic Permeability, and Mechanical Performance of Asymmetric Monophasic Cellulose Acetate/Silica Membranes: Spinodal Decomposition Mix

“…Figure 7 c–e also show a strong peak between 1070 and 1075 cm −1 , which can be attributed to the ν δ (C-O-C) stretching band found in the pristine CA1 membrane or to the ν δ (Si-O-Si) stretching vibration [ 35 , 36 , 37 , 38 , 39 ]. Since the percentages attributed to this second peak (25–33%) are very close to the percentage of the pristine membrane (33%), it is envisioned that this contribution is due to the C-O-C groups of cellulose acetate rather than Si-O-Si groups.…”

“…All the hybrid membranes exhibited a third peak located between 1111 cm −1 and 1114 cm −1 , attributed to the ν δ (Si-O-C) [ 37 , 38 , 39 , 40 ]. The area of this peak increases with the silica content, from 9% to 12% and 14% in CA1/SiO 2 90/10, 80/20, and 70/30 membranes, respectively.…”

“…As was said for the membranes of series one, peaks appearing in this region can also be attributed to ν δ (Si-O-Si), but because the areas of the peaks are similar to the one found in the pristine CA membrane of series two (32%) and because the CA content is always much higher than the SiO 2 content in all membranes, it is estimated that this peak appears in all membranes due to the C-O-C groups of CA. The third peaks found in Figure 8 c–e, located at 1123 cm −1 and 1124 cm −1 , are attributed to the ν δ (Si-O-C) [ 37 , 40 ]. The fourth and last peak appearing at 1160 cm −1 for the CA2/SiO 2 90/10, 80/20, and 70/30 membranes is attributed to ν δ (Si-O-Si) [ 35 , 37 , 38 , 39 , 40 ].…”

Synthesis and Characterization of Novel Integral Asymmetric Monophasic Cellulose–Acetate/Silica/Titania and Cellulose–Acetate/Titania Membranes

“…Figure 6 shows the curve-fitting decomposition of the region between 1000 and 1110 cm −1 for the CA/SiO 2 /TiO 2 membranes, and Table 5 shows the values of the wavelength and relative peak areas. The peak centered at 1039 cm −1 corresponds to the symmetric COC vibrations of the acetate group (ν s COC (acetate)) [ 39 , 40 ], and the peak centered at 1067 cm −1 corresponds to ν a SiOSi [ 41 , 42 , 44 , 45 , 46 ]. This indicates the formation of a Si–O–Si network, probably in nano/micro-clusters dispersed throughout the polymer matrix [ 24 ].…”

Innowacje opakowaniowe na rynku produktów konsumpcyjnych

“…Siła wzajemnych oddziaływań jest istotna ze względu na potencjalne kierunki zastosowań funkcjonalnych materiałów oraz ich trwałość. Obecność silnych i trwałych połączeń powinna ograniczyć ryzyko migracji czy dekompozycji, co ma najistotniejsze znaczenie dla utrzymania jakości, a także zapewnienia bezpieczeństwa ich stosowania (Drisko i Sanchez, 2012;Kickelbick, 2007;Krasia--Christoforou, 2015;Romero i Sanchez, 2004;Wojciechowska i Foltynowicz, 2009;Wojciechowska, Heimowska, Foltynowicz i Rutkowska, 2011;Wojciechowska, Foltynowicz i Nowicki, 2013a;Wojciechowska, Foltynowicz i Nowicki, 2013b;Wojciechowska, Pietras i Maciejewski, 2014).…”