Analysis of the composition of mixed fibers by thermogravimetric analysisأداة الاختبار –

Thermogravimetric Analysis to Detect Blended Fiber Composition Analysis

Since any fiber will inevitably degrade at a certain temperature, thermogravimetric analysis can be used to identify fiber characteristics. Thermogravimetric analysis is used to characterize the characteristics of certain bicomponent blended fibers and is a method for qualitative analysis of blended fibers. Mixtures of two filaments, such as cellulose and nylon, wool and nylon, and a series of multi-component fibers can also be analyzed in the same way as single-component samples. Differential thermogravimetric analysis can not only distinguish various fibers, but also distinguish some mixed two-component fibers. Differential thermogravimetric analysis makes it possible to identify the presence of certain fibers in a mixturefiber, even in very small quantities, despite the interactions between the components.

In thermogravimetric analysis, the mass of the sample is recorded continuously under the condition of linear temperature increase. The temperature-mass diagram helps to know the mass changes caused by heat, such as drying, chemical reaction, degradation and volatilization.

1. Sample preparation:

All samples were purified according to the Suges extraction method, first using light gasoline, followed by methanol extraction. Use the 39 RPM winding wheel to spin the mixed yarn into small skeins, then cut into thin sections. Small scissors can also be used to cut fibers into lengths less than 2 mm.

2. Procedure:

Analyze with a thermogravimetric analyzer. Take 20mg of non-thermoplastic fiber or 4 mg of thermoplastic fiber and heat it at a heating rate of 25°C/mm and in a continuous air extraction environment. The sample was heated isothermally at 140°C for 2 hours to dry, then cooled to 30°C before analysis. The thermogravimetric curves obtained can be differentiated according to temporal simultaneity using simulated differential units.

When testing synthetic fibers, reduce the sample size because the synthetic fibers will foam as they break down and strike the thermocouple that monitors the temperature of the sample. In order to obtain a larger DTG thermal peak, the heating rate must also be relatively large.

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