Regulating and controlling method for degradation capability of aliphat polytetramethylene adipate material
A technology of polybutylene adipate and polyester material, which is applied in the field of regulating the degradation performance of biodegradable polymer materials, can solve problems such as no cause, and achieve the effects of easy operation, easy realization and simple process
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Embodiment 1
[0024] Embodiment 1. adjust the content of crystals of different structures in the PBA sample by controlling the isothermal crystallization temperature, and adjust the degradation rate
[0025] Melt the PBA sample on a hot stage at 75°C for 3 minutes, and cool it to 27°C, 28°C, 29°C, 30°C and 31°C at a cooling rate of 260°C / min. After constant temperature for 1 hour, use a wide-angle X- The PBA sample was detected by X-ray diffraction, and the detection showed that the α and β crystal forms coexisted. Through peak division calculation, it can be known that the content of the two crystals varies with the crystallization temperature. The data are shown in Table 1. Degradation experiments prove that the degradation rate of polyester materials increases with the increase of α-crystal content, and the degradation rate results are shown in Table 1. Table 1 shows the relative content and corresponding degradation rate of α crystal and β crystal formed after PBA isothermal crystalliza...
Embodiment 2
[0028] Embodiment 2. Adjust the content of different crystal structures in the PBA sample by controlling the cooling rate of non-isothermal crystallization, and regulate the degradation rate
[0029] The PBA sample was melted on a hot stage at 75 degrees for 3 minutes, and cooled to room temperature at a cooling rate of 10°C / min, 15°C / min and 20°C / min, respectively, and the PBA sample was detected by wide-angle X-ray diffraction. The detection showed that α and β crystal forms coexist, and the content of α crystal and β crystal in the sample changes with the cooling rate, and the data are shown in Table 2. Degradation experiments have proved that the degradation rate of polyester materials increases with the increase of α-crystal content. Therefore, adjusting the relative content of polycrystals by changing the cooling rate can achieve the purpose of controlling the degradation rate. The degradation rate results are shown in Table 2. Table 2 shows the relative content and corr...
Embodiment 3
[0032] Example 3. Adjust the crystal content of the two structures in the sample by different annealing times, thereby regulating the degradation rate of the polyester material
[0033] The PBA sample was melted on a hot stage at 80°C for 3 minutes, cooled to 25°C at a cooling rate of 200°C / min, and kept at constant temperature for 1 hour to obtain pure β crystals. Then they were annealed on a hot stage at 47 degrees for 1 hour and 5 hours, and part of the β crystals were transformed into α crystals. According to the results of wide-angle X-ray diffraction, the relative content of crystals with different structures was calculated. The results are shown in Table 3. Degradation experiments proved that the samples annealed for 5 hours had a faster degradation rate because they had more α-crystal content than the samples annealed for 1 hour. The results are shown in Table 3. Table 3 shows the relative content and degradation rate of the crystals of the two structures after the β c...
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