A Method for Evaluating the Minimum Decomposition Initiation Temperature of Thermal Decomposition Reactions of Substances
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
Active Publication Date: 2021-09-10
NANJING UNIV OF SCI & TECH
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[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
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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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The invention relates to a method for evaluating the minimum decomposition initiation temperature of a thermal decomposition reaction of a substance. A series of peak temperatures (T p ) and peak onset temperature (T o ) value, and fit to get T o with β, T P Relational expression with β; according to the decrease of the heating rate β, the peak temperature of the DSC exothermic (endothermic) peak (T p ) and peak onset temperature (T o ) value keeps getting smaller and closer, using T o with β, T P and β relationship to obtain the intersection point of the two, at this intersection point, the peak temperature is equal to the initial temperature, it is considered that the intersection point temperature (T op ) is the minimum decomposition onset temperature of the reaction. The present invention has been verified through the constant temperature TG experiment, and effectively avoids taking multiple long-term constant temperature experiments to test T o , it is easier and more efficient to estimate the minimum decomposition onset temperature of the thermal decomposition reaction.
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...
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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