Synthetic method of hyperbranched polymer and application of hyperbranched polymer in modified thermosetting resin

Abstract

The invention belongs to the technical field of polymer synthesis and relates to a synthetic method of a hyperbranched polymer and application of the hyperbranched polymer in modified thermosetting resin. Particularly, the hyperbranched polymer is synthesized by adopting a 'one-pot method', and the synthetic method is simple, environment-friendly and efficient. The surface of the hyperbranched polymer contains a plurality of functional groups and can be modified according to actual needs; and by using the hyperbranched polymer as a modifying agent of the thermosetting resin, obvious viscosityreducing and toughening effects can be achieved. Compared with the existing synthetic method, the synthetic method provided by the invention has the advantages of wider application prospects, higher economic benefits, more environment protection and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, and relates to a synthesis method of hyperbranched polymer and its application in modified thermosetting resin. Specifically, the "one-pot method" is used to synthesize hyperbranched polymers, and the synthesis method is simple, green and efficient. Background technique [0002] Epoxy resins are widely used in the fields of coatings, adhesives, semiconductor packaging materials, concrete modification, and high-performance composite materials because of their good processability, good mechanical properties and dimensional stability after curing. However, due to the high brittleness of epoxy resin after curing, the impact strength is poor in practical applications. In addition, because it contains a large number of polar groups after curing, its weather resistance and moisture resistance are poor. In order to make up for the above defects in the application of epoxy resin, since the 198...

AI Technical Summary

Problems solved by technology

Although there are many methods for toughening and modifying epoxy resin, they all have their disadvantages: most of the modification of inorganic particles requires the use of coupling agents to improve the compatibility of inorganic particles and resin matrix, even so, the phenomenon of particle agglomeration is still common; thermoplasticity Elastomer or thermosetting resin modification is prone to phase separation and resin viscosity increase; polymers with active end groups (such as HTBN, CTBN, etc.) improve the compatibility with the resin matrix while toughening, but , with the increase of toughening agent content, it reduces the manufacturability of the material

[0005] Although hyperbranched polymers have shown great application prospects in the field of thermosetting resins, especially epoxy resin modification, and there are many synthetic methods in patent documents, hyperbranched polymers modified thermosetting resins have not been industrialized on a large scale.

The reason is that the synthesis conditions of hyperbranched polymers are harsh, multi-step synthesis is required, some require anhydrous and oxygen-free, and the separation and purification are extremely difficult

In addition, most of the raw materials are expensive, and there are many side reactions, and some by-products can be highly toxic or corrosive

[0006] For example, the method of hydrosilylation requires the use of expensive noble metals as catalysts, and the synthesis cost is extremely high (Synthesis and characterization of optically active hyperbranched poly(carbosiloxane)s, Macromolecules.2002,35(13):4938-4945) The method of reversible-dormant radical polymerization requires anhydrous anaerobic conditions, and some chain transfer agents are very expensive (Synthesis and Characterization of Novel Epoxy-and Oxetane-Functional Reversible Addition-Fragmentation Chain Transfer Agents, Macromolecules, 2007, 40( 24): 8586-8592); silane hydrolysis method, although the cost is low, gel reaction often occurs in the polymerization process, and corrosive by-products such as HCl are produced after the reaction (A Novel Hyperbranched Polysiloxane Containing Epoxy and Phosphaphenanthrene Groups and its Multi-Functional Modification of Cyanate Ester Resin, Soft Materials, 2013, 11(3):346-352)

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