The main factors affecting the curing effect of polysilazane are as follows:
Formula composition
Polymer structure and molecular weight: The types, quantities, and distributions of functional groups in the molecular chain of polysilazane vary, leading to differences in curing reaction activity and post curing properties. Molecular chains containing more active groups may have a faster curing reaction rate. Molecular weight affects molecular motion and crosslinking density. Low molecular weight polysilazane molecules have strong mobility and fast curing reaction, but low crosslinking density results in poor mechanical properties after curing; Although high molecular weight polysilazane can form high cross-linking density, molecular movement is difficult, which may result in incomplete curing.
Curing agent: The type of curing agent determines the curing reaction mechanism and speed, and the reaction activity between different curing agents and polysilazane varies. The dosage is also crucial. If the dosage is insufficient, the polysilazane cannot be fully crosslinked, the curing is incomplete, and the performance is poor; Excessive dosage may cause rapid curing reaction, generate internal stress, and affect the properties of the cured material.
Filler: Adding fillers can improve the performance of polysilazane, but it can also affect the curing effect. The surface properties of fillers interact with polysilazane and curing agents, which can alter the rate and degree of curing reaction. Active fillers can react with polysilazane or curing agents to promote curing; Inert fillers may have a diluting effect, reducing the curing reaction rate. The particle size, shape, and content of fillers also have an impact. Small particle size and high specific surface area fillers can increase the contact area with polysilazane, affecting the curing effect.
environmental factor
Temperature: when the temperature rises, the molecular movement intensifies and the curing reaction speed accelerates, which can shorten the curing time. However, if the temperature is too high, the reaction may be out of control, resulting in problems such as burst polymerization and gel, affecting the performance of the cured product; Low temperature, slow reaction rate, incomplete curing, and poor performance.
Humidity: Humidity has a significant impact on the curing of polysilazane, especially for polysilazane containing active groups. In high humidity environments, moisture may react with active groups in curing agents or polysilazanes, consuming active ingredients, delaying or hindering curing reactions, and may also lead to a decrease in the properties of the cured material, such as the generation of bubbles and reduced adhesion.
Ventilation: Good ventilation can timely eliminate volatile substances generated during the curing process, such as small molecule by-products, which is conducive to the curing reaction and improves the curing effect and quality of the cured material. Poor ventilation and accumulation of volatile substances may inhibit curing reactions or form pores and defects in the cured material.
Process factors
Stirring speed: Stirring can evenly mix polysilazane, curing agents, and other additives, increase intermolecular contact opportunities, and promote curing reactions. Slow stirring speed, uneven mixing of various components, and incomplete local reactions; Excessive stirring speed may cause excessive shear force in the system, disrupt the molecular structure of polysilazane, or affect the orderly progress of the curing reaction.
Curing time: Insufficient curing time leads to insufficient cross-linking reaction of polysilazane, resulting in suboptimal properties of the cured material; However, if the curing time is too long, it may lead to a decrease in the properties of the cured material, such as excessive cross-linking causing the material to become brittle, or prolonged curing in high temperature environments causing material aging.
Coating method: Different coating methods will result in different distribution and thickness uniformity of polysilazane on the substrate surface, affecting the curing effect. Spraying can evenly distribute polysilazane, but there may be issues with uneven atomization or insufficient thickness; Brushing may result in uneven thickness, affecting the performance after curing.

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