Surface carboxyl-functionalized core-shell type magnetic composite microballoons and preparation method thereof
A technology of magnetic composite microspheres and carboxyl functionalization, which is applied in the field of functional materials to achieve the effects of controllable thickness and crosslinking degree, high magnetic content, and regular structure
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Embodiment 1
[0023] Example 1: Core-shell Fe with a shell thickness of about 30 nm and a crosslinking degree of 20% 3 o 4 / Preparation of PMAA microspheres
[0024] 1. Preparation of citric acid-stabilized magnetic clusters
[0025] 1.2g ferric chloride hexahydrate (FeCl 3 ·6H 2 O), 2.4g ammonium acetate (NH 4 Ac), after dissolving 0.3g citric acid in 70ml ethylene glycol, put it into a 150ml three-neck flask, then raise the temperature to 120°C, keep it warm for 1 hour, then transfer the liquid in the flask to a 100ml Teflon liner In a high-pressure reaction kettle, put the reaction kettle into an oven at 200°C for 24 hours, take it out, and cool it to room temperature with tap water. The product is separated by magnetic separation, washed with absolute ethanol to remove unreacted reactants, and finally the product is dispersed in absolute ethanol for later use.
[0026] 2. Active vinyl modification on the surface of magnetic clusters
[0027] Add the magnetic clusters obtained ab...
Embodiment 2
[0030] Example 2: The core-shell Fe with a shell thickness of about 60 nm and a crosslinking degree of 20% 3 o 4 / Preparation of PMAA microspheres
[0031] 1. The preparation of citric acid-stabilized magnetic clusters is the same as described in Example 1-1.
[0032] 2. Carrying out active vinyl modification on the surface of magnetic clusters is the same as that described in Examples 1-2.
[0033] 3. Core-shell Fe 3 o 4 / PMAA was prepared as described in Examples 1-3. The difference is that methacrylic acid, N, N' The dosages of -methylenebisacrylamide and 2,2-azobisisobutyronitrile are 2ml, 500mg, and 40mg, respectively.
Embodiment 3
[0034] Example 3: The shell thickness is about 30nm, and the cross-linking degree is 10% core-shell Fe 3 o 4 / Preparation of PMAA microspheres
[0035] 1. The preparation of citric acid-stabilized magnetic clusters is the same as described in Example 1-1.
[0036] 2. Carrying out active vinyl modification on the surface of magnetic clusters is the same as that described in Examples 1-2.
[0037] 3. Core-shell Fe 3 o 4 / PMAA was prepared as described in Examples 1-3. The difference is N, N' - The amount of methylenebisacrylamide used is 110 mg.
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