Crosslinking type polymer anionic membrane and preparation method thereof

Abstract

The invention discloses a crosslinking type polymer anionic membrane and a preparation method of crosslinking type polymer anionic membrane. Anionic membrane takes a polymer containing chloromethyl group as a main chain; in preparation, the chloromethylation of polymer anionic membrane and ionization of the main chain are carried out successively, a biguanide or multi-guanide structural aquogel is prepared, and the aquogel performs thermal polymerization at original site in the membrane to form a membrane; at last, through the alkali treatment, the anion-exchange membrane is obtained. The guanidine type polymer contains a lot of guanidine radicals capable of conducting anion easily, and the ion conductivity can be effectively improved; the water-retaining ability of silane can also improve the ionic conduction ability of the membrane; the ion group is free from beta-H, so that Hofmann degradation can be eliminated; the super absorbent and inflation resistance of aquogel can improve water content of membrane, reduce OH- salvation degree, lighten attack of ON- to ion base, and improve the alkali stability of the membrane; the crosslinking structure can further inhibit the membrane swelling. The prepared membrane is high in water absorbent, low in swelling rate, and able to obviously improve the alkali stability of the membrane.

Description

Technical field [0001] The invention relates to the field of battery membrane materials, in particular to a cross-linked polymer anion membrane and a preparation method thereof. Background technique [0002] Energy, life, and environment are issues of global concern in the 21st century. With the growth of human demand for energy, energy issues have become one of the major global problems. At this stage, the development of reusable, environmentally friendly and high conversion rate energy technologies has become a research hotspot. Fuel cell technology is a new type of energy technology that uses electrochemical reactions to convert chemical energy stored in fuel into electrical energy. It is one of the better solutions to energy and environmental issues. Traditional Proton Exchange Membrane Fuel Cell (PEMFC) has the advantages of high energy conversion efficiency, high energy density, and environmental friendliness, but its reliance on precious metal catalysts and perfluorosulfo...

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Problems solved by technology

Yan Yushan et al. prepared quaternary phosphonium anion membranes with high conductivity and good chemical stability [Yushan Yan, et al., Angewandte Chemie International Edition, 2009, 48, 6499.]; The conductivity of polyethersulfone membrane is higher than that of commercial quaternary ammonium membrane, and it is stable in 1M KOH at 60°C for 48 hours, but the membrane is very brittle and expensive [S.Gu, R.Cai, et al., Angew.Chem.~Int .Ed.,2009,48,6499.]

[0006] The room temperature conductivity of the guanidinium-salted polyarylethersulfone membrane reported by Zhang Suobo and others can reach 67mS / cm, and the ion exchange capacity remains unchanged after immersion in 1M NaOH at 60°C for 48 hours, but the membrane is easy to swell and has low water absorption [Chinese patent CN 102479962 A]; Zhu Xiuling of Dalian University of Technology and others prepared polyarylether anion membranes, which have good overall performance but the membrane making process is cumbersome and not suitable for commercialization [Chinese patent CN 102952265 A]; Wan J.H. of Changchun Institute of Applied Chemistry used Polyarylethersulfone anion exchange membrane containing guanidine structure, which has excellent stability and high conductivity, and the ion conductivity at room temperature can be as high as 6.7×10 -2 S / cm, but the film-making process uses chloromethyl methyl ether as a chloromethylation reagent, which is a serious carcinogen, and in the chloromethylation reaction, there will be a large number of sub-crosslinks of methylene bridges The formation of reaction will significantly reduce the ion exchange capacity of the product [Wang J, Li S, et al., Macromolecules, 2010, 43, 3890~3896.]

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