tailieunhanh - Thermal Properties of Green Polymers and Biocomposites Part 4

Tham khảo tài liệu 'thermal properties of green polymers and biocomposites part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 2 CHARACTERIZATION OF GREEN POLYMERS In this chapter experimental techniques which are ordinarily used in investigation of green polymers and related compounds will briefly be introduced. Conformation of apparatuses results and practical experimental conditions will be included. Apparatuses introduced here are commercially available and widely found in laboratories. Experimental conditions of thermal analysis are in a moderate temperature range in which green polymers are measurable. 1. THERMAL ANALYSIS Thermal analysis is defined as an analytical experimental technique which investigates the physical properties of a sample as a function of temperature or time under controlled conditions. This definition is broad and the following techniques are referred to conventionally as thermal analysis . thermogravimetry TG differential thermal analysis DTA differential scanning calorimetry DSC thermomechanometry TMA and dynamic mechanical analysis DMA . Recently simultaneous measurements combining various techniques are widely used In this section TG-DTA TG-Fourier transform infrared spectroscopy TG-FTIR DSC TMA and DMA will briefly be introduced. Detailed information is shown elsewhere 1-36 . 14 Chapter 2 Figure 2-1. Conformation of thermal analysis apparatuses. Thermogravimetry TG TG-differential thermal analysis DTA Thermogravimetry is the branch of thermal analysis which examines the mass change of a sample as a function of temperature in the scanning mode or as a function of time in the isothermal mode. A schematic conformation of a thermogravimeter is shown in Figure 2-2. At the present almost all apparatuses used in the measurements of green polymers are those which enable simultaneous measurement of TG and differential thermal analysis DTA to be carried out. Balance systems kinds of crucible flow gas systems and other special attachments are described elsewhere in detail 6 18 32 . Figure 2-2. Schematic conformation of thermogravimeter. .

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