Cellulose acetate aerogels
An aerogel and cellulose technology, applied in the field of cellulose acetate aerogel, can solve problems such as unfriendly and inefficient environment, and achieve the effect of low density and high porosity
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Embodiment 1
[0129] Example 1: Synthesis and Characterization of Aerogels
[0130] method
[0131] Material: Cellulose acetate flakes, referred to herein as "CDA", were obtained from Eastman Chemical Co. (Cat. No. CA-394-60S) with a degree of substitution of about 2.5 and used as received. Acetone (99%), ethanol, triethylamine (TEA), trichloro(octyl)silane (TCOS; 99%), and the cross-linker 1,2,4,5-benzenetetracarboxylic acid - also known as benzene Tetraacid dianhydride (PMDA) - available from Sigma Aldrich. Deionized (DI) water is used for all water uses. Using liquid CO with siphon from Airgas in the laboratory 2 bottle of dry ice. All solvents used for wicking measurements were 99% pure and purchased from Sigma Aldrich.
[0132] Gelation of cellulose esters: Airgels prepared with different amounts of cellulose acetate were synthesized using PMDA as a crosslinker as shown below. Four solutions containing CDA were prepared: 2 wt%, 4 wt%, 6 wt% and 8 wt%. The weight percentages ...
Embodiment 2
[0201] Example 2: Adsorption of non-polar substances using airgel
[0202] method
[0203] Airgel modification: Cellulose acetate aerogels were modified into hydrophobic and / or lipophilic aerogels using chemical vapor deposition (CVD). Such as figure 2 A bottle in a bottle setup is shown for this purpose, where trichloro(octyl)silane (TCOS) is placed in a smaller bottle and the airgel sample is suspended from a wire suspended from the upper part of the larger bottle net, so that the airgel is placed on top of the smaller bottle. figure 2 The airgel shown in contains 4 wt% CDA. The amount of TCOS used is twice the weight of the airgel. Typically, 100-120 μL of TCOS is used to treat 50-60 mg of airgel samples at a time. Place the system in an oven at 80 °C for 2 hours.
[0204] X-ray Photon Spectroscopy (XPS): XPS analysis was performed using a SPECS FlexMod system with a PHOIBOS 150 hemispherical analyzer. The base pressure in the analysis chamber is at 10 -10 in ...
Embodiment 3
[0225] Example 3. Tuning the Mechanical Properties of Aerogels
[0226] method
[0227] Material: Cellulose acetate (CA, also referred to herein as CDA) flakes supplied by Eastman Chemical Co. with a degree of substitution of 2.45 and an acetyl content of 39.7% were used as received. Reagent grade acetone (99.5%), triethylamine (TEA) and cross-linker 1,2,4,5-pyrimellitic acid (also known as pyromellitic dianhydride, PMDA) were purchased from Sigma Aldrich. Deionized (DI) water with a pH of 6.74 was used. Liquid N 2 Bottles were purchased from Airgas (NC).
[0228] Organogel Synthesis: Cellulose acetate gels were synthesized as reported above. Briefly, a homogeneous solution of 4 wt% CA in acetone was formed by stirring in a 100 ml Pyrex bottle for 24 hours. Assuming that one PMDA molecule reacts with two hydroxyl groups on different CA chains, it means that a CA:PMDA molar ratio of 2:1 is required for complete crosslinking. In this example, a CA:PMDA molar ratio of 8...
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