Cellulose acetate butyrate nanocomposites synthesized via sol-gel method

Abstract

Cellulose acetate butyrate nanocomposites synthesized via sol-gel method Summary -Novel hybrid nanocomposites were synthesized from modified cellulose acetate butyrate (MCAB) via sol-gel reaction at ambient temperature. The inorganic phase was introduced in situ by hydrolysis-condensation of tetraethoxysilane (TEOS) in different concentrations, using an acid catalyst, in the presence of organic polymer dissolved in acetone. Infrared spectroscopy (IR) was used to monitor modification of CAB and nanocomposites characterization. The silica network of obtained nanocomposites was characterized by solid state 29 Si NMR. Morphology of the samples and degree of dispersion of inorganic phase in the polymer matrix were investigated using atomic force microscopy (AFM). The organic-inorganic nanocomposites exhibit better mechanical properties than unmodified cellulose acetate butyrate.

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.…”

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).…”