Graphene/polysiloxane spun fiber membrane and preparation method thereof

Abstract

The invention provides a graphene / polysiloxane spun fiber membrane and a preparation method thereof. The preparation method comprises the following steps of dispersing graphene in a silane dilute solution, and performing a stirring reaction to obtain a graphene suspension; uniformly mixing graphene turbid liquid with a multifunctional silane monomer, adding a catalyst, performing a hydrolysis pre-polycondensation reaction, and removing small molecules under reduced pressure to prepare a prepolymer; dissolving the prepolymer in an organic solvent to prepare a polymer spinning solution; and carrying out electrostatic spinning. According to the preparation method, the polycondensation degree, the crosslinking degree and the structure of the polysiloxane prepolymer for spinning are regulated and controlled, a polysiloxane sol-gel chemical process in a short time of electrostatic spinning is accurately controlled, and graphene is supplemented for supporting and enhancing the fiber performance, so that the graphene / polysiloxane spun fiber membrane is prepared, and the technical difficulty of curing forming of polysiloxane spun fiber is overcome. The prepared fiber membrane has important application prospects in the fields of electrochemistry, catalysis, sensors, adsorption and separation, flexible electronic elements and medical engineering.

Description

technical field [0001] The invention relates to a graphene / polysiloxane spinning fiber membrane and a preparation method thereof, belonging to the technical field of new materials. Background technique [0002] Fibers with good mechanical properties made from polymers by spinning require polymers to be linear polymers with appropriate relative molecular weights, and there must be sufficient secondary valence forces and good crystallization capabilities between molecular chains of polymers. Such as polyethylene terephthalate, polycaprolactam, polyhexamethylene adipamide, polyparaphenylene terephthalamide, polyacrylonitrile and polypyrrolidone. Polysiloxane is a type of polymer with a Si-O-Si main chain structure and one or two organic groups on the silicon atom. It has the characteristics of high and low temperature resistance, weather resistance, hydrolytic stability and biocompatibility. . Chinese patent document CN104805598A discloses a method for preparing a vinyl polys...

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Problems solved by technology

The invention does not clarify the molecular structure of the vinyl polysiloxane material. If the polymer is a linear polysiloxane with a weight average molecular weight in the range of 5,000-180,000 g / mol, the polymer is fluid or highly viscous Fluid, electrospinning can not get a formed fiber membrane structure; if it is cross-linked vinyl polysiloxane, the inventive method cannot make a good spinning solution, so it is impossible to obtain a fiber membrane with good shape and other properties

[0003] Linear polysiloxanes are usually viscous fluids with small secondary valence forces between polymer chains and low crystallinity, making it difficult to prepare fibers with good mechanical properties by traditional methods; while cross-linked polysiloxanes usually cannot obtain good Therefore, it is impossible to obtain fiber membranes with good morphology and other properties by electrospinning.

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