Thermal studies on natural and modified gums by Thermal Gravimetric Analysis (TGA) (CAT#: STEM-ACT-0049-WXH)

Introduction

Gums are classified as natural and modified gum. Natural gums include seaweed extracts (e.g. alginates), plant exudates (e.g. arabic and tragacanth gums), gums from seed or root (e.g. potato starch), and gums obtained by microbial fermentation (e.g. gum xanthan). Modified gums include mostly cellulose and starch derivatives, such as ethers and esters of cellulose.

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Principle Applications Procedure Materials Notes Related Products

Principle

Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes. This measurement provides information about physical phenomena, such as phase transitions, absorption, adsorption and desorption; as well as chemical phenomena including chemisorptions, thermal decomposition, and solid-gas reactions (e.g., oxidation or reduction).

Applications

• Thermal characterization of polymers.
• Determination of the composition of alloys and mixtures.
• Determining the purity and thermal stability of both primary and secondary standards.

Procedure

TGA analysis is performed by gradually raising the temperature of a sample in a furnace as weight is measured on an analytical balance that remains outside the furnace. Thermogravimetric analysis instrument measures the changes in a sample's weight in a particular temperature by enclosing the sample in an oven.

Materials

Thermogravimetric analyzer

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