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Method for evaluating minimum decomposition initial temperature of substance thermal decomposition reaction

A technology of starting temperature and thermal decomposition, applied in thermal analysis of materials, analyzing materials, instruments, etc., can solve problems such as inability to accurately evaluate the reaction starting temperature, and achieve simple and efficient prediction, simple steps, and high fitting degree Effect

Active Publication Date: 2019-08-20
NANJING UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the above-mentioned prior art cannot accurately evaluate the real onset temperature of the reaction, the purpose of the present invention is to provide a method for evaluating the minimum decomposition onset temperature of the thermal decomposition reaction of the substance

Method used

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  • Method for evaluating minimum decomposition initial temperature of substance thermal decomposition reaction
  • Method for evaluating minimum decomposition initial temperature of substance thermal decomposition reaction
  • Method for evaluating minimum decomposition initial temperature of substance thermal decomposition reaction

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Embodiment 1

[0026] This example discloses an evaluation method for solving the minimum starting temperature of thermal decomposition reaction of polylactic acid (PLA) by using the intersection method.

[0027] Weigh 10 mg PLA samples respectively and carry out DSC test at the heating rate of 1, 2, 5, 10, 15K / min under the argon purge gas atmosphere of 20mL / min, as figure 1 shown. After analyzing the T at each heating rate o with T p The values ​​are shown in Table 1.

[0028] Table 1 shows the reaction initiation temperature (T o ) and peak temperature (T p )

[0029] Table 1

[0030] β (K / min) 1 2 5 10 15 T o (K)

582.85 592.55 607.05 619.75 625.35 T p (K)

604.95 614.45 632.55 645.85 655.05

[0031] T obtained by logarithmic fitting o with β, T P The relationship with β:

[0032] T o = 15.97 × lnβ + 582.1

[0033] T p = 18.66 × lnβ + 603.3

[0034] Combine the two equations to get lnβ = -7.84, the intersection temperature T o...

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Abstract

The invention relates to a method for evaluating the minimum decomposition initial temperature of a substance thermal decomposition reaction. A series of values of peak temperature (Tp) and peak staring point temperature (To) are obtained according to the DSC (differential scanning calorimetry) heat release (absorption) peaks of substance decomposition under different linear temperature rising rates beta; fitting is performed on the values, so that the relational expression of To and beta and the relational expression of TP and beta can be obtained; and on the basis of the law that the valuesof the peak temperature (Tp) and peak staring point temperature (To) of the DSC heat release (absorption) peaks continuously decrease and are closed to each other as the temperature rising rate beta decreases, the intersection point of the values of the peak temperature (Tp) and peak staring point temperature (To) is obtained according to the relational expression of To and beta and the relationalexpression of TP and beta, the peak temperature is equal to the staring point temperature at the intersection point, and such intersection point temperature (Top) is the minimum decomposition starting temperature of the reaction. The method of the invention is verified through a constant-temperature TG experiment, so that a condition that repeated long-time constant-temperature experiment testingis applied can be avoided, and the minimum decomposition initial temperature of the thermal decomposition reaction can be estimated more simply and efficiently.

Description

technical field [0001] The invention belongs to the field of material stability testing, and relates to a method for evaluating the minimum decomposition starting temperature of a thermal decomposition reaction of a substance. Background technique [0002] Decomposition initiation temperature (T o ) is an important parameter to evaluate the thermal properties of materials, and can be used to judge the thermal stability, safety, and storage properties of substances. To study the starting temperature of a chemical reaction, one of the methods is to place the chemical at several specified temperatures for a long time for constant temperature observation, and determine the lowest temperature when the reaction occurs, that is, the starting temperature of the reaction. This long time may be several days, several months or several years; the selected reaction temperature may be five, ten or more, so it takes a long time. Another method commonly used at this stage is to use therma...

Claims

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Application Information

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IPC IPC(8): G01N25/00
CPCG01N25/00
Inventor 成一孟颖异李艳春程龙宋东明李一帆杨月
Owner NANJING UNIV OF SCI & TECH
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