Method for testing swelling degree of solid powdery polymer composite material

Abstract

The invention discloses a method for testing the swelling degree of a solid powdery polymer composite material. The method comprises the following steps: firstly, carrying out compression molding on a solid powdery polymer composite material, cutting into square slices, polishing to be flat by using a grinding tool, then packaging the slices by using a cloth bag, putting into a Soxhlet extractor, adding methyl ethyl ketone, carrying out reflux impregnation, and calculating the swelling degree according to the weight before and after impregnation. The method disclosed by the invention is relatively high in repeatability and stability, stable in test data, capable of better characterizing the impregnation degree of the test sample on methyl ethyl ketone, and suitable for a high-molecular polymer composite material of which the main component is more than 95% of polyamide, polyurethane, polyimide and the like.

Description

technical field [0001] The invention belongs to the technical field of performance detection of polymer composite materials, and relates to a method for testing the swelling degree of solid powder polymer composite materials. Background technique [0002] Polymer composite materials are mainly divided into polymer structural composite materials and polymer functional composite materials. The polymer structure composite material consists of two parts, one is the reinforcing material, which is a fiber and fabric with high strength, high modulus and temperature resistance, such as glass fiber, silicon nitride whisker and other fiber fabric; the other is the matrix material , Mainly adhesives that play a role in bonding, such as unsaturated polyester resin, epoxy resin, phenolic resin, polyimide and other thermosetting resins and styrene, polypropylene and other thermoplastic resins. Structural materials are divided into polymer matrix composites, metal matrix composites, carbo...

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Problems solved by technology

[0004] For polymer composite materials whose appearance is solid powder, the general swelling test method has the problems of specificity and poor applicability, including defects such as solvent type, test procedure and method are not clear

Document 1 (Yang Libin, Sun Benhui, Xu Yexin, et al. Swelling characteristics of polyimide membranes in different alcohol / water systems [J]. Membrane Science and Technology, 2008 (02): 44-47.) studied different alcohol concentrations The influence on the swelling characteristics of polyimide (PI) membrane, but the main body of the swelling degree test material used is PI homogeneous membrane, this method cannot be applied to the swelling degree test of powder PI

Chinese patent application 201710106267.2 discloses a method for detecting the swelling degree of solid powder. The solid powder of the test object is swollen in an ultrafiltration centrifuge tube, and then the free water in the swollen product is removed by centrifugation. The swelling degree of the test substance can be obtained by weight calculation, but it is only applicable to the swelling degree detection of polymer carbonates such as sevelamer, sevelamer carbonate, sevelamer hydrochloride and other raw materials and preparations

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