The storage conditions of polysilazane have a significant impact on its solidification, mainly reflected in the following aspects:
In terms of temperature
The impact of low-temperature storage:
If polysilazane is stored at a lower temperature environment (such as below its glass transition temperature), the thermal motion of molecules becomes extremely slow, which can effectively suppress its own slow curing reaction, especially for those polysilazanes that have certain reactivity at room temperature. Low temperature can keep them in a relatively stable state, maintain good fluidity and operability, extend their storage life, and enable them to continue the expected curing reaction process when needed in the future.
The impact of high temperature storage:
On the contrary, when stored in a high-temperature environment, polysilazane molecules gain more energy and their molecular motion intensifies, which makes it easier for the functional groups inside to react with each other, thereby accelerating the curing process. For example, if polysilazane, which was originally planned to be used at room temperature and slowly cured at a certain rate, is exposed to high temperatures for a long time (such as over 40 ℃), it may undergo cross-linking and curing in advance, causing it to lose its fluidity, become difficult to use, and even have incomplete curing or curing product properties that do not meet expectations. This unexpected high temperature induced curing may disrupt the normal curing reaction mechanism.
Regarding humidity
The role of a dry environment:
Polysilazane stored in a dry environment can avoid unnecessary hydrolysis and other curing reactions due to premature contact with moisture for those types that are sensitive to moisture and rely on water reaction to initiate curing. For example, some polysilazanes containing hydrolyzable silicon nitrogen bonds have extremely low moisture content in dry environments (such as humidity below 30%), and their chemical bonds can remain stable without prematurely initiating the hydrolysis and condensation curing process, which helps maintain their initial chemical state and properties, and facilitates precise curing by controlling curing conditions according to actual needs in the future.
The problem of high humidity environment:
When stored in high humidity environments (such as humidity above 70%), moisture easily enters the polysilazane system. For polysilazane sensitive to humidity, moisture will react with it quickly, which may cause it to start curing in the storage container, causing caking, gel and other phenomena, which seriously affect its normal use. Moreover, this unexpected curing caused by high humidity is often difficult to control the degree and quality of curing, making the final cured product fail to meet the ideal performance requirements.
Regarding lighting
The benefits of storing in the dark:
Many polysilazanes are sensitive to ultraviolet and other light sources in sunlight. If exposed to light for a long time, energy such as ultraviolet radiation may trigger chemical bond breakage, rearrangement, and other reactions within the molecules of polysilazane, thereby inducing premature curing reactions. For example, some polysilazanes containing unsaturated functional groups may generate free radicals under light exposure, which can promote cross-linking between molecules, causing the polysilazane to solidify during storage. However, storing in the dark can minimize the impact of light on it, maintain its original state, and ensure normal curing operations in the future.
Adverse effects of lighting environment:
When polysilazane is exposed to strong light, light can become an additional source of energy, causing molecular changes that may not only accelerate curing, but also lead to deviations in the structure and properties of the cured product from expectations. For example, the originally uniform curing system may experience local over curing or incomplete curing due to uneven lighting, which can affect the overall curing quality and product performance.
In terms of container material and sealing performance
The significance of suitable container material:
If the container material is chosen improperly, it may undergo a chemical reaction with polysilazane, affecting its stability and thus affecting curing. For example, some metal containers (such as iron containers) may react with the active functional groups in polysilazane, releasing impurities such as metal ions, which can interfere with the normal curing reaction of polysilazane, change its curing rate or the properties of the cured product. Containers made of glass or specific plastics (such as polytetrafluoroethylene and other chemically stable materials) can avoid chemical reactions caused by container materials, ensure the chemical stability of polysilazane during storage, and facilitate normal curing in the future.
The importance of good sealing:
A well sealed container can prevent external substances such as air and moisture from entering, maintaining a relatively stable storage environment inside the polysilazane. If the sealing of the container is poor, oxygen and moisture from the outside are easy to enter. For polysilazanes that are sensitive to oxygen and moisture, it is easy to cause unexpected curing reactions. For example, polysilazanes containing active functional groups may undergo oxidative crosslinking reactions when exposed to oxygen in the air, leading to premature curing and affecting their normal use and curing quality.

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