The preparation method of PVA/P (AA-AM) composite aquogelTechnical field
the invention belongs to chemical field, in particular, the present invention relates to the preparation method's of PVA/P (AA-AM) composite aquogel improvement.
Background technology
macromolecule hydrogel is a kind of functional materials with cross-linked three D network structure that can be swelling in water surrounding, and in the field such as biomimetic material, chemical industry, application is comparatively extensive.
adopting differing materials to prepare polymkeric substance composite aquogel is the effective ways that obtain high-performance, multifunctional polymer hydrogel.Because the hydrogel of the compound preparation of differing materials can have the special performance that is different from corresponding single-material hydrogel, thereby receive people's very big concern.The polymkeric substance composite aquogel of having reported mainly contains polymkeric substance plural gel (her AA plural gel of PAM, polyvinyl alcohol sulphur glycan plural gel etc.) and polymer/inorganic thing composite aquogel (polyacrylamide Fu Run soil plural gel), and related kind is less.
the hydrogel stable chemical nature that polyvinyl alcohol (PVA) forms, is easy to moulding, have no side effect, be a kind of conventional functional materials, but its water-retaining capacity poor, do not possess pH susceptibility and complex function.
Summary of the invention
the present invention is exactly for the problems referred to above, and PVA/P (AA-AM) composite aquogel of a kind of polyvinyl alcohol and PVA/P (AA-AM) composite crosslinking is provided.
for realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme, and PVA/P of the present invention (AA-AM) composite aquogel is: by vinylformic acid, regulate its pH to 10 with NaOH solution, add gac to carry out purifying; After filtration, in quantitative filtrate, add acrylamide and deionized water; After fully dissolving, acrylamide proceeds to three mouthfuls of reaction flasks that are placed in water bath with thermostatic control and electric mixer is housed; Logical N2after deoxygenation, add ammonium persulphate and sodium bisulfite; After polyreaction, reaction product is precipitated with dehydrated alcohol.
by the vacuum-drying of gained throw out; PVA is being dissolved with distilled water, leaving standstill until completely dissolved; Add quantitative P (AA-AM) and it is fully dissolved, then by the pH value to 3.5 of HCl regulation system; Add glutaraldehyde, fully stir; Then soak with deionized water, change water one time every 24 h.
beneficial effect of the present invention.
reaction conditions gentleness of the present invention, productive rate is high, and the present invention is compared with existing macromolecule hydrogel, and water-absorbent increases substantially; Approximately reach the more than 3 times of existing macromolecule hydrogel water-intake rate, the occasion of the macromolecule hydrogel that energy to meet the need water-intake rate is higher, practical, there is good promotional value.
Embodiment
pVA/P of the present invention (AA-AM) composite aquogel is.
by vinylformic acid, regulate its pH to 10 with NaOH solution, add gac to carry out purifying; After filtration, in quantitative filtrate, add acrylamide and deionized water; After fully dissolving, acrylamide proceeds to three mouthfuls of reaction flasks that are placed in water bath with thermostatic control and electric mixer is housed; Logical N2after deoxygenation, add ammonium persulphate and sodium bisulfite; After polyreaction, reaction product is precipitated with dehydrated alcohol.
by the vacuum-drying of gained throw out; PVA is being dissolved with distilled water, leaving standstill until completely dissolved; Add quantitative P (AA-AM) and it is fully dissolved, then by the pH value to 3.5 of HCl regulation system; Add glutaraldehyde, fully stir; Then soak with deionized water, change water one time every 24 h.
embodiment 1.
by vinylformic acid, regulate its pH to 10 with the NaOH solution of 2 mol/L, add gac to carry out purifying; After filtration, in quantitative filtrate, add acrylamide and deionized water by 3:1, making monomer mass mark is 10%; After fully dissolving, acrylamide proceeds to three mouthfuls of reaction flasks that are placed in water bath with thermostatic control and electric mixer is housed; Logical N2after deoxygenation 30 min, add quantitative ammonium persulphate and sodium bisulfite; After polyreaction, reaction product is precipitated with dehydrated alcohol.
by 40 ℃ of vacuum-dryings of gained throw out; Use distilled water 90 ℃ of dissolvings PVA, leave standstill 1.5 h at 70 ℃ until completely dissolved; Add quantitative P (AA-AM) and it is fully dissolved, then by the pH value to 3.5 of HCl regulation system; Add the glutaraldehyde of the amount of drafting, fully stir; At 50 ℃ of constant temperature 24 h, then soak 7 d with deionized water, change water one time every 24 h.
above content is the further description of the present invention being done in conjunction with concrete preferred implementation; can not assert that specific embodiment of the invention is confined to these explanations; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the definite protection domain of claims that the present invention submits to.