The Chemistry of Polymer Cross-Linkers , Product Article - ChemPoint

Why Use Titanate and Zirconate Cross-Linkers?

As mentioned previously, titanate and zirconate cross-linkers are extremely versatile. Since they react with hydroxyl, carboxyl, and amine groups, they are excellent cross-linkers for many different polymers used in industrial applications, such as the ones listed below.

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• Polyamide
• Nitrocellulose
• Polyurethane
• Polyvinyl butyral
• Polyvinyl alcohol
• Cellulose acetate butyrate
• Cellulose acetate propionate
• Ethylene-vinyl acetate
• Cellulose
• Starch
• Guar

When cross-linking occurs, many of the polymer’s physical properties are improved. These properties typically increase the overall durability and resiliency of the chemistry and application they are used in. Examples of this are presented below.

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Greater Mechanical Strength

Prior to being cross-linked, individual polymers may move freely past each other, allowing flexibility and deformation to occur in the chemistry or material they are used in. As mentioned, titanate and zirconate cross-linkers form bonds that create a fixed network of polymers. This network restricts the individual movement of polymers and serves as a better distribution for mechanical stress. Therefore, the cross-linked material is more rigid and resistant to deformation. It should be noted that while this property helps improve aspects such as impact resistance and tensile or compressive strength, it may cause embrittlement. Thus, carefully controlling the degree of cross-linking is important.

Improved Water Resistance

Water resistance is important for materials such as coatings, sealants, and adhesives engineered to perform in outdoor or marine environments that are constantly exposed to humidity or water. Once incorporated with polymers, titanate and zirconate cross-linkers form strong covalent bonds that make the chemistry resistant to hydrolysis. This improves the overall water resistance of the cross-linked system.

Enhanced Thermal Stability

Enhanced Thermal Stability Several materials that leverage the use of titanate and zirconate cross-linkers, such as heat-resistant coatings, also benefit from the strong covalent bonds that are formed. These bonds increase the overall thermal stability of the polymer network, increasing the heat resistance of the chemistry or material compared to before the polymer was cross-linked.

Example Applications of Titanate and Zirconate Cross-Linkers

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