Method for judging thermo-crosslinking process scope of thermoplastic polymer
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A thermoplastic polymer and thermal crosslinking technology, applied in the field of new technology development, can solve the problems of lack of universality and complexity in the chemical structure analysis of polymers
Active Publication Date: 2018-05-15
DALIAN UNIV OF TECH
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Embodiment 1
[0041] According to attached figure 1 As shown, the crosslinking process conditions for the upper limit of the optimal thermal crosslinking degree of thermoplastic polymer polyaryletherketone are: thermal crosslinking temperature is 380°C, heating rate is 3°C / min, constant temperature time is 30min, and the crosslinking atmosphere is air , the air flow rate is 200ml / min.
[0042] according to image 3 As shown, the cross-linking process conditions for the optimal thermal cross-linking degree lower limit of the thermoplastic polymer polyaryletherketone are: thermal cross-linking temperature is 350 °C, cross-linking heating rate is 3 °C / min, constant temperature time is 30 min, cross-linking atmosphere For air, the air flow rate is 200ml / min.
[0043] Therefore, the optimal thermal crosslinking degree process of thermoplastic polymer polyaryletherketone is: thermal crosslinking temperature is 350-380°C, crosslinking heating rate is 3°C / min, constant temperature time is 30min, ...
Embodiment 2
[0045] According to attached figure 2 Shown, the crosslinking process condition of the upper limit of the optimum thermal crosslinking degree of thermoplastic polymer polyaryletherketone is: thermal crosslinking temperature is 430 ℃, and heating rate is 10 ℃ / min, constant temperature time 0min (described in the present invention The constant temperature time is 0, which means that the temperature is not kept warm after the temperature reaches the target temperature, but the heating is stopped directly), the crosslinking atmosphere is air, and the air flow rate is 100ml / min.
[0046] according to Figure 4 As shown, the cross-linking process conditions for the optimal thermal cross-linking degree lower limit of the thermoplastic polymer polyaryletherketone are: thermal cross-linking temperature is 350 °C, cross-linking heating rate is 3 °C / min, constant temperature time is 30 min, cross-linking atmosphere For air, the air flow rate is 200ml / min.
[0047] Therefore, the optim...
Embodiment 3～11
[0049] The procedure of Example 2 was repeated for the thermoplastic polymers specified in Table 1 below, where the test results are listed.
[0050] Table 1
[0051]
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Abstract
The invention relates to a method for judging the thermo-crosslinking process scope of a thermoplastic polymer, belonging to the field of new technology development. According to the method for judging the thermo-crosslinking process scope of the thermoplastic polymer, a thermo-gravimetric curve of the thermoplastic polymer or a weight variation curve of the thermoplastic polymer treated by meansof different thermo-crosslinking processes as well as an energy storage modulus curve or a loss factor curve related to dynamic thermal mechanical analysis of a thermo-crosslinking film are comprehensively analyzed, and the cross-linking process conditions of the optimum thermal cross-linking degree upper limit and the cross-linking process conditions of the optimal thermal cross-linking degree lower limit are judged, so that the optimal thermal cross-linking degree is determined. The method for judging the thermo-crosslinking process scope of the thermoplastic polymer can be used for simply,conveniently and visually judging the thermal cross-linking degree of the thermoplastic polymer, thus not only being capable of effectively regulating and optimizing the structure and performance of athermoplastic polymer-based carbon film, but also being applied to other fields, such as preparation of high toughness and high damage tolerance resin composite material matrix, of application of thecrosslinked thermoplastic polymer.
Description
technical field [0001] The invention relates to a method for judging the thermal crosslinking process range of thermoplastic polymers, and belongs to the field of new technology development. Background technique [0002] Carbon membrane is a carbon-based membrane material obtained by high temperature pyrolysis of polymer membrane in vacuum or inert atmosphere. It has excellent gas permeation separation performance, as well as thermal and chemical stability. The precursor of the carbon film is usually a thermosetting polymer, because the thermosetting polymer can not melt during the carbonization process, and the morphology of the film is well maintained. However, the choice of thermosetting polymers that can prepare high-performance carbon films is limited, and these thermosetting polymers generally have the problems of high price, difficult synthesis, and complicated preparation process. If a thermoplastic polymer is used as a precursor to prepare a carbon film, it needs t...
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