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Polymer foams | additives feature


compound used by the customer. In foamed, injection-moulded PP parts, nucleation of


cell formation with halloysite can be used to maintain mechanical properties while further reducing density. “Halloysite differs from other nucleating agents, such as talc and calcium carbonate, in that it both nucleates bubble formation in foaming and nucleates crystal formation in foamed and unfoamed applications. Crystal nucleation restores the strength and modulus proper- ties that can be lost due to foaming,” claims DeArmitt. While these results were obtained by adding


separate masterbatches of Dragonite and the formu- lated foaming agent, Applied Minerals is now working on loading its hollow Dragonite tubes with a CFA to create foam nucleation, crystal nucleation, and reinforcement from one additive. Since the tubes have a 15-nm sized hole, bubbles released from the tubes would be small, which should further improve mechani- cal and insulative properties. Nucleating agents are also used with physical


blowing agents. Interfacial Solutions, an independent R&D service provider, presented a study at the AMI Polymer Foams 2012 event that compared supercritical


carbon-dioxide foaming with talc and several different nanoparticles as a nucleating agent. Researchers found that, as expected, cell size decreases and cell density increases with smaller nucleating agents. Researchers also found that a maleated polyethylene coupling agent with a nanoclay created a more stable foam, but an acrylate terpolymer coupling agent did not, possibly due to poor compatibility. Coupling agents can be used in foam formulations to


The high


surface area of Applied


Minerals’


halloysite can bring benefi ts to foamed plastics


This Multifunctional Additive is a POWERFUL LITTLE PELLET


STRUKTOL® TR 063A


Our newest Intelligent Additive Solution is specifically designed to improve the processability of filled or reinforced nylon compounds. Added during compounding or at the molding machine, processors will see:


Increased Productivity Longer Flow Lengths


To find out more about our additives or to request a sample, call 330.928.5188 or email plastics@struktol.com or visit www.4struktol.com


Superior Mold Release Expanded Possibilities


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