Ethylene Propylene Rubber Domain Morphology Tuning for Low Temperature Container Impact Survival
Tuning EPR domains to 0.4-0.8 microns with 45 percent ethylene content ensures sub-zero container shock survival at minus 30 degrees Celsius.
Polyolefin Elastomer Dispersion
Meaning
Aqueous polymer suspensions provide a method for coating or blending polyolefins without the use of organic solvents. When utilizing a polyolefin elastomer dispersion, fine particles of the elastomer are suspended in water to allow uniform application to various substrates. This form is used to improve the impact resistance and flexibility of coatings, adhesives, and textiles.
Blending Mechanism
Microscopic particles of the elastomer are distributed evenly throughout the liquid carrier to facilitate blending. In a polyolefin elastomer dispersion, these droplets are stabilized by surfactants to prevent coagulation. When mixed with a base polymer emulsion, the elastomer provides toughening by absorbing impact energy and arresting crack propagation.
Processing Advantages
Environmental regulations have led many manufacturers to seek alternatives to solvent-based formulations. Choosing a polyolefin elastomer dispersion eliminates volatile organic compounds from the coating process while maintaining the flexibility of the finished product. This transition helps companies meet regulatory compliance without sacrificing the barrier properties of the packaging.
Thermal Properties
Low-temperature flexibility is a critical requirement for flexible packaging films used in cold storage. Incorporating a polyolefin elastomer dispersion into the film formulation ensures that the polymer stays tough and ductile at temperatures below freezing. This modification prevents package failure and leaks during shipping and handling in refrigerated trucks.
The elastomer particles act as stress concentrators that initiate localized shear yielding, which consumes the impact energy before it can trigger brittle fractures in the main polyolefin matrix.