Polymer Combinations and Blends

Polymer combinations and blends are important in a wide variety of applications. Generally they provide advantages that cannot be obtained with either of the base materials alone. For example, a mixture of two thermoplastic materials allows for a combination of high flow rates and good processing performance with low viscosity; mixing a crystalline polymer with an amorphous polymer results in a material with excellent dimensional stability and stiffness. In addition, some polymers have a range of special chemical properties, such as impact resistance, which can be exploited by combining them with other polymers.

Mixing in Totes

Mixing Polymers with EvenMix can be a challenging proposition. Many different designs exist, with the choice primarily based on the product properties and the amount of mixing energy required. Mixers may be mechanical or non-mechanical. The latter include the use of an electromagnetic or ultrasonic system that uses a frequency generator to generate a high-frequency field to disrupt the particles in the liquid, without the need for moving parts or mechanical energy. Non-mechanical systems are more efficient than their mechanical counterparts, and they may be easier to operate, with a smaller footprint and lower maintenance costs.

The entropy of mixing, which is the main driving force for mixing of small molecules, becomes a much smaller contributor for large molecular weight materials, making it difficult to achieve complete mixing in polymer mixtures. In addition, the physical interactions between the components of a polymer blend can prevent complete mixing if they are strong enough.

Even with a sufficiently strong mixer, it is common for the particles in a polymer blend to become misaligned and for phase separation to occur. Large interfacial tensions can lead to a decrease in mechanical properties, while particle size increase can also have negative effects on the blend's properties. To minimize these issues, it is often necessary to add interfacial agents to the blend known as compatibilizers.

During the selection process for a portable mixer to be used in totes, Birmingham's engineering team focused on the mixer's light weight. The new EvenMix portable mixer was less than half the weight of some competing models, and it required only one person to handle during operation. EvenMix's unique design allows it to fit into the tote with minimal space, and it can be removed easily once the mixing process is complete, leaving the agitator inside the tote. This enables the user to take the mixer with them as they ship or distribute the polymer, ensuring that it remains up to specification even after leaving the plant. This level of versatility is a significant advantage for companies that frequently work with totes in their operations. A tote mixer that is easy to transport and store will make a significant difference for any company seeking to maximize the value of their investment in mixing technology. This includes the use of tote mixers in on-site applications such as construction and petrochemical production. To find out more about how EvenMix can improve your tote mixing processes, contact us.