Polyisobutylene succinimide (PIBSA) is a polymer with excellent thermal stability, hydrolytic stability and chemical inertness. Due to its unique properties, PIBSA has wide applications in many fields, such as coatings, adhesives, plastic modifiers, etc. In recent years, studies have found that the introduction of nitrogen can significantly improve the performance of PIBSA. However, how differences in nitrogen content affect the performance of PIBSA still needs to be further explored. This article will systematically study the effect of nitrogen content on the performance of PIBSA to provide a theoretical basis for optimizing its performance.
The performance of PIBSA is closely related to its molecular structure. Typically, the introduction of polar groups can improve the hydrophilicity and adhesive properties of polymers. The introduction of nitrogen can effectively increase the polarity of the polymer, so it is expected to improve the performance of PIBSA. In addition, the introduction of nitrogen can also increase the Lewis acidity of the polymer, giving it better performance as a catalyst or ion exchanger.
In this experiment, different nitrogen-containing monomers (such as trimethylenediamine, dimethylenediamine, etc.) were polymerized with isobutylene to prepare PIBSA samples with different nitrogen contents. During the experiment, other reaction conditions were controlled to be the same, and only the nitrogen content was changed. The prepared PIBSA samples were characterized by infrared spectroscopy (IR), hydrogen nuclear magnetic resonance spectroscopy (1H NMR), and thermogravimetric analysis (TGA), and their properties, such as water absorption, adhesive properties, and thermal stability, were tested.
Through experimental data, it was found that as the nitrogen content increases, the hydrophilicity and adhesive properties of PIBSA gradually increase. This is because the introduction of nitrogen increases the polarity of the polymer, making it easier to interact with water molecules. At the same time, the introduction of nitrogen also improves the Lewis acidity of the polymer, giving it better performance as a catalyst or ion exchanger. However, too high nitrogen content will lead to a decrease in the thermal stability of PIBSA because nitrogen atoms are easily oxidized at high temperatures.
This article systematically studied the effect of nitrogen content on the performance of PIBSA and found that appropriately increasing the nitrogen content can improve the hydrophilicity and adhesive properties of the polymer. However, too high nitrogen content can lead to a decrease in thermal stability. Therefore, when optimizing the performance of PIBSA, it is necessary to comprehensively consider the effects of nitrogen content and other reaction conditions to obtain the best performance.
Although this article has preliminarily discussed the effect of nitrogen content on the performance of PIBSA, the specific mechanism of nitrogen in polymers still requires further research. In the future, the impact on the performance of PIBSA can be studied more deeply by changing the introduction method, position and content of nitrogen atoms. In addition, the impact of different types of nitrogen-containing monomers on the performance of PIBSA can also be investigated in order to find the best synthesis route and nitrogen source.