CN108586661A - A kind of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel and the preparation method and application thereof - Google Patents
A kind of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel and the preparation method and application thereof Download PDFInfo
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Abstract
The present invention relates to intelligent macromolecule material fields; disclose a kind of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel and its synthetic method and application; first by being acylated olefin group modification on to tertiary butyl p tertButylcalixarene with 4 prenyl chlorides; then pass through free radical polymerization and N isopropylacrylamide hydrogel skeletons are introduced to tertiary butyl p tertButylcalixarene by acylated, obtain cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel.The present invention is using 4 prenyl chlorides as acylating agent, acylation reaction mild condition, and easy to operate, can will aromatic modified to tert-butyl-calix [4] be olefinic monomer by single step reaction.Hydrogel prepared by the present invention can be used for the circulation absorption and desorption of organic pollution.
Description
Technical field
The present invention relates to intelligent macromolecule material fields, and in particular to a kind of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel
And the preparation method and application thereof.
Background technology
Pentachlorophenol is widely used in insecticide and wood preservative, can be released slowly into sky gas and water and soil.It
There is carcinogenic effect to human body, while can also disturbance endocrine system.In the prior art, the pentachloro- in absorption method removing water is commonly used
Phenol, the active charcoal of common sorbing material, silica gel, activated alumina and molecular sieve etc..But there are adsorption equilibriums for these materials
Slowly the problems such as, regeneration rate is low, and Regeneration Ways energy consumption is high, thus there is an urgent need for develop a kind of adsorption rate it is high, can simple regenerated material.
Polyisopropyl acrylamide (PNIPAM) hydrogel, the porous structure with three-dimensional network and perforation, specific surface area
Height, swelling ratio is big, is suitable for adsorption from aqueous solution.In addition, PNIPAM intramolecules hydrogen bond, intermolecular hydrogen bonding and with hydrone it
Between hydrogen bond action, so that its segment is dissolved in water；But when temperature is increased to eutectic point (LCST) or more, the parts PNIPAM and water
Between hydrogen bond be destroyed, intramolecular and intermolecular hydrogen bonding keep PNIPAM segments hydrophobic with hydrophobic effect, volume contraction, to have
There is Thermo-sensitive.Therefore, PNIPAM hydrogels can be used for circulation absorption and De contamination.
But pentachlorophenol has higher Octanol/water Partition Coefficients (logkow=5.25), by the strong PNIPAM of hydrophily
Hydrogel adsorbs weaker (equilibrium adsorption rate=1.52mg/g).Therefore, it is to improve it to carry out hydrophobically modified to PNIPAM hydrogels
To a kind of method of pentachlorophenol adsorption rate.Due to tertiary butyl p tertButylcalixarene (TBCX4) not only can by hydrophobic effect,
But also host-guest interaction can be utilized to adsorb organic molecule pentachlorophenol.The present invention is used to tertiary butyl p tertButylcalixarene alkenes
Hydrophobic monomer carries out simple free-radical polymerized, preparation with N-isopropylacrylamide (NIPAM) by solvent of Isosorbide-5-Nitrae-dioxane
Go out cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel (PNIPAM-TBCX4), to realize efficient, the renewable suction to pentachlorophenol
It is attached.The method for not using free-atom aqueous solution micellar copolymerization when being copolymerized due to NIPAM and hydrophobic monomer, so not needed in reaction
Surfactant is added, the LCST of product will not be impacted.
Invention content
In order to overcome the shortcomings and deficiencies of the prior art, primary and foremost purpose of the invention is to provide a kind of cup [4] aromatic hydrocarbons
(CX4) preparation method of hydrophobically modified temperature-sensitive hydrogel.
Another object of the present invention is to provide the temperature sensitive water-settings of the cup being prepared by the above method [4] aromatic hydrocarbons hydrophobically modified
Glue.
It is still another object of the present invention to provide the applications of above-mentioned cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel.
The purpose of the present invention is achieved through the following technical solutions：
A kind of cup [4] aromatic hydrocarbons (CX4) hydrophobically modified temperature-sensitive hydrogel, structural formula are shown in formula I：
In Formulas I, the natural number that m is 1 or more, the natural number that n is 20 or more, n：M is 1：(20~50).
The preparation method of cup [4] the aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel includes the following steps：First by with 4- penta
Alkene acylated with acid chloride modifies olefin group on to tertiary butyl p tertButylcalixarene, then passes through free radical polymerization by acylated to tertiary fourth
Base cup [4] aromatic hydrocarbons introduces n-isopropyl acrylamide hydrogel backbone, obtains cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel.
The acylation is to the synthetic route of tertiary butyl p tertButylcalixarene as shown in Formula II：
The preparation method of cup [4] the aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel specifically includes following steps：
(1) it is added in reactor to tertiary butyl p tertButylcalixarene, 4- prenyl chlorides, triethylamine, chloroform, isothermal reaction,
It is filtered to remove insoluble matter, filtrate uses hydrochloric acid, sodium hydroxide, water washing, separates chloroform phase successively, dry with anhydrous magnesium sulfate
Dry, after filtering, vacuum distillation removes the solvent of filtrate, obtains acylated to tertiary butyl p tertButylcalixarene；
(2) n-isopropyl acrylamide, acylation are to tertiary butyl p tertButylcalixarene, azodiisobutyronitrile and 1,4- dioxane
It is mixed in the reactor of nitrogen protection, reacts, obtain gel；
(3) gel is impregnated successively with Isosorbide-5-Nitrae-dioxane and deionized water, is then filtered, filter residue and drying to constant weight obtains
To cup [4] aromatic modified temperature-sensitive hydrogel.
Step (1) molar ratio to tertiary butyl p tertButylcalixarene, 4- prenyl chlorides, triethylamine is 1:4:4.05；It is described
The dosage of chloroform uses 2.5L chloroforms according to 1mol to tertiary butyl p tertButylcalixarene.
Step (2) n-isopropyl acrylamide is acylated to tertiary butyl p tertButylcalixarene, azodiisobutyronitrile and 1,4-
The molar ratio of dioxane is 1：(0.02~0.05)：1.38×10-3：6.43.
Step (1) described concentration of hydrochloric acid is 5wt%, naoh concentration 5wt%；The hydrochloric acid, sodium hydroxide, water
Dosage is each 2.5L, and the anhydrous magnesium sulfate dosage is the 1/5 of chloroform volume.
Step (3) the 1,4- dioxane dosage is 100 times of gel quality；The 1,4- dioxane soaking time
It it is 2 days, deionized water soaking time is 5 days, and a soak was changed every 10~12 hours.
Step (1) described isothermal reaction is 38~40 DEG C, constant temperature 3 hours；Step (2) described isothermal reaction is 60 DEG C, permanent
Temperature 2 hours；Step (3) described drying condition is 50 DEG C of vacuum drying.
Application of cup [4] the aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel in removing removal organic polluter.
The method of the removal is circulation absorption and desorption；The organic pollution is pentachlorophenol.
The present invention has the following advantages and effects with respect to the prior art：
The present invention is using 4- prenyl chlorides as acylating agent, acylation reaction mild condition, and easy to operate, by single step reaction
Can will aromatic modified to tert-butyl-calix [4] be olefinic monomer.
Cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel of the present invention is a kind of novel temperature sensitive type water gel material,
When environment temperature is less than its LCST, cup [4] aromatic hydrocarbons of hydrophobic part can effectively adsorb pentachlorophenol, when environment temperature is less than
When its LCST, adsorbed pentachlorophenol is released, to realize recycling, there is potential application in sewage treatment field.
Description of the drawings
Fig. 1 is hydrogen nuclear magnetic resonance spectrogram of the acylation to tertiary butyl p tertButylcalixarene of the preparation of the embodiment of the present invention 1.
Fig. 2 is the infrared spectrum of the PNIPAM-CX4 of the embodiment of the present invention 1~3.
Specific implementation method
With reference to embodiment, the present invention is described in further detail, and embodiments of the present invention are not limited thereto.
Embodiment 1
A kind of preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel, specific implementation step are as follows：
The first step：The acylated synthesis to tertiary butyl p tertButylcalixarene：It weighs to tertiary butyl p tertButylcalixarene 9.77g
(0.01mol), triethylamine 4.19g (4.05 × 10-2Mol), 4- amylene acyls are added dropwise in reaction bulb in chloroform 250mL dropwise
Chlorine 1.19g (0.04mol) controlling reaction temperatures react 3h, gradually have precipitation to generate in mixed liquor at 38 DEG C；It is insoluble to filter removing
Object, filtrate with 5% hydrochloric acid, 5% sodium hydroxide, water washing, are separated chloroform phase, are dried with anhydrous magnesium sulfate successively
Afterwards, vacuum distillation removes solvent, and obtained acylation is as shown in Figure 1 to the hydrogen nuclear magnetic resonance spectrogram of tertiary butyl p tertButylcalixarene；
Second step：Acylation synthesized by n-isopropyl acrylamide (NIPAM) 11.3g (0.1mol), step 1 is to tertiary fourth
Base cup [4] aromatic hydrocarbons 1.95g (2 × 10-3Mol), azodiisobutyronitrile 0.227g (1.38 × 10-3) and 1,4- dioxane mol
56.7g (0.643mol) is uniformly mixed, and is passed through nitrogen to empty the air of the inside, 60 DEG C of constant temperature react 2h, obtain gel.
Third walks：The gel that polymerization is obtained is impregnated 2 days with Isosorbide-5-Nitrae-dioxane, then is impregnated 5 days with deionized water, every
A soak is changed within 10 hours, is filtered, to remove small-molecule substance therein, is then dried under vacuum to constant weight for 50 DEG C, obtains cup
[4] aromatic modified temperature-sensitive hydrogel, infrared spectrum is as shown in Fig. 2 upper left figures.
Embodiment 2
A kind of preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel, specific implementation step are as follows：
The first step：The acylated synthesis to tertiary butyl p tertButylcalixarene：It weighs to tertiary butyl p tertButylcalixarene 9.77g
(0.01mol), triethylamine 4.19g (4.05 × 10-2Mol), 4- amylene acyls are added dropwise in reaction bulb in chloroform 250mL dropwise
Chlorine 1.19g (0.04mol) controlling reaction temperatures react 3h, gradually have precipitation to generate in mixed liquor at 39 DEG C；It is insoluble to filter removing
Object, filtrate with 5% hydrochloric acid, 5% sodium hydroxide, water washing, are separated chloroform phase, are dried with anhydrous magnesium sulfate successively
Afterwards, vacuum distillation removes solvent；
Second step：Acylation synthesized by n-isopropyl acrylamide (NIPAM) 11.3g (0.1mol), step 1 is to tertiary fourth
Base cup [4] aromatic hydrocarbons 2.93g (3 × 10-3Mol), azodiisobutyronitrile 0.227g (1.38 × 10-3) and 1,4- dioxane mol
56.7g (0.643mol) is uniformly mixed, and is passed through nitrogen to empty the air of the inside, 60 DEG C of constant temperature react 2h, obtain gel.
Third walks：The gel that polymerization is obtained is impregnated 2 days with Isosorbide-5-Nitrae-dioxane, then is impregnated 5 days with deionized water, every
A soak is changed within 11 hours, is filtered, to remove small-molecule substance therein, is then dried under vacuum to constant weight for 50 DEG C, obtains cup
[4] aromatic modified temperature-sensitive hydrogel, infrared spectrum is as shown in Fig. 2 upper right figures.
Embodiment 3
A kind of preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel, specific implementation step are as follows：
The first step：The acylated synthesis to tertiary butyl p tertButylcalixarene：It weighs to tertiary butyl p tertButylcalixarene 9.77g
(0.01mol), triethylamine 4.19g (4.05 × 10-2Mol), 4- amylene acyls are added dropwise in reaction bulb in chloroform 250mL dropwise
Chlorine 1.19g (0.04mol) controlling reaction temperatures react 3h, gradually have precipitation to generate in mixed liquor at 40 DEG C；It is insoluble to filter removing
Object, filtrate with 5% hydrochloric acid, 5% sodium hydroxide, water washing, are separated chloroform phase, are dried with anhydrous magnesium sulfate successively
Afterwards, vacuum distillation removes solvent；
Second step：Acylation synthesized by n-isopropyl acrylamide (NIPAM) 11.3g (0.1mol), step 1 is to tertiary fourth
Base cup [4] aromatic hydrocarbons 4.89g (5 × 10-3Mol), azodiisobutyronitrile 0.227g (1.38 × 10-3) and 1,4- dioxane mol
56.7g (0.643mol) is uniformly mixed, and is passed through nitrogen to empty the air of the inside, 60 DEG C of constant temperature react 2h, obtain gel.
Third walks：It is impregnated 5 days by polymerization obtained gel Isosorbide-5-Nitrae-dioxane 2 days, then with deionized water, it is small every 12
When change a soak, filter, to remove small-molecule substance therein, be then dried under vacuum to constant weight for 50 DEG C, obtain cup [4] virtue
Hydrocarbon is modified temperature-sensitive hydrogel, and infrared spectrum is as shown in Fig. 2 lower left figures.
Effect example
1. the measurement of water absorption and swelling rate：At 25 DEG C, PNIPAM-CX4 xerogel prepared by 1g the method for the present invention impregnates
48h in deionized water then takes out, and wipes the water on surface away, weighs, and is calculated by the mass values with xerogel after absorbing water
Water absorption and swelling rate.
Measure the water absorption and swelling rate at 25 DEG C that embodiment 1,2,3 prepares cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel
Respectively 21,20,17, and the swelling ratio of traditional PNIPAM hydrogels is 13.
2. glass [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel is used for the Adsorption measure of merit of pentachlorophenol in solution：It will
The hydrogel of absorption pentachlorophenol saturation is put into constant temperature in 50 DEG C of deionized water and for 24 hours, carries out desorption and regeneration experiment, then again
Secondary carry out adsorption experiment, into next round detachment assays.With ultraviolet spectra to the concentration point of pentachlorophenol after each adsorption and desorption
Analysis, and more wheel suction-detachment assays are carried out, to investigate hydrogel regenerating stability.Hydrophobically modified temperature-sensitive hydrogel is used for pentachloro-
The absorption of phenol, removal rate up to 95%, are higher than traditional PNIPAM hydrogels substantially.Cup [4] aromatic modified temperature-sensitive hydrogel exists
The complete desorption to pentachlorobenzene powder can be realized under the conditions of 50 DEG C, by 5 wheel adsorption-desorptions experiment after, desorption rate still close to
100%, good absorption stability is maintained, it can be achieved that recycling utilization.
The adsorption rate and desorption rate of table 1PNIPAM hydrogels and PNIPAM-CX4 hydrogels to pentachlorophenol
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (10)
1. a kind of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel, it is characterised in that：Its structural formula is shown in formula I：
In Formulas I, the natural number that m is 1 or more, the natural number that n is 20 or more, n：M is 1：(20~50).
2. the preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel according to claim 1, it is characterised in that including with
Lower step：First by being acylated by olefin group modification on to tertiary butyl p tertButylcalixarene with 4- prenyl chlorides, then pass through certainly
N-isopropyl acrylamide hydrogel backbone is introduced to tertiary butyl p tertButylcalixarene by acylated by base polymerization, cup [4] aromatic hydrocarbons is obtained and dredges
Water is modified temperature-sensitive hydrogel.
3. the preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel according to claim 2, it is characterised in that：Method
Specifically include following steps：
(1) it is added in reactor to tertiary butyl p tertButylcalixarene, 4- prenyl chlorides, triethylamine, chloroform, isothermal reaction, filtering
Insoluble matter is removed, filtrate is used hydrochloric acid, sodium hydroxide, water washing, separates chloroform phase, dried with anhydrous magnesium sulfate successively, mistake
After filter, vacuum distillation removes the solvent of filtrate, obtains acylated to tertiary butyl p tertButylcalixarene；
(2) n-isopropyl acrylamide, it is acylated to tertiary butyl p tertButylcalixarene, azodiisobutyronitrile and 1,4- dioxane in nitrogen
It is mixed in the reactor of gas shielded, reacts, obtain gel；
(3) gel is impregnated successively with Isosorbide-5-Nitrae-dioxane and deionized water, is then filtered, filter residue and drying to constant weight obtains cup
[4] aromatic modified temperature-sensitive hydrogel.
4. the preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel according to claim 3, it is characterised in that：Step
(1) molar ratio to tertiary butyl p tertButylcalixarene, 4- prenyl chlorides, triethylamine is 1:4:4.05；The use of the chloroform
Amount uses 2.5L chloroforms according to 1mol to tertiary butyl p tertButylcalixarene.
5. the preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel according to claim 3, it is characterised in that：Step
(2) n-isopropyl acrylamide, acylation rub to tertiary butyl p tertButylcalixarene, azodiisobutyronitrile and 1,4- dioxane
You are than being 1：(0.02~0.05)：1.38×10-3：6.43.
6. the preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel according to claim 3, it is characterised in that：Step
(1) concentration of hydrochloric acid is 5wt%, naoh concentration 5wt%；The hydrochloric acid, sodium hydroxide, water dosage be each
2.5L, the anhydrous magnesium sulfate dosage are the 1/5 of chloroform volume.
7. the preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel according to claim 3, it is characterised in that：Step
(3) the 1,4- dioxane dosage is 100 times of gel quality；The Isosorbide-5-Nitrae-dioxane soaking time is 2 days, deionization
Water-soaking time is 5 days, and a soak was changed every 10~12 hours.
8. the preparation method of cup [4] aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel according to claim 3, it is characterised in that：Step
(1) isothermal reaction is 38~40 DEG C, constant temperature 3 hours；Step (2) described isothermal reaction is 60 DEG C, constant temperature 2 hours；Step
(3) drying condition is 50 DEG C of vacuum drying.
9. application of cup [4] the aromatic hydrocarbons hydrophobically modified temperature-sensitive hydrogel in removing removal organic polluter according to claim 1.
10. application according to claim 9, it is characterised in that：The method of the removal is circulation absorption and desorption；It is described
Organic pollution is pentachlorophenol.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113583190A (en) * | 2021-07-12 | 2021-11-02 | 武汉理工大学 | 4-tert-butylcalix [4] arene modified polycarboxylic acid water reducer and preparation method thereof |
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Application publication date: 20180928 |