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Predicting Polyolefin Foamability
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Predicting Polyolefin Foamability
 
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Predicting Polyolefin Foamability
From Associated Polymer Labs, Inc.
 

 

Many different polyolefinic foams and effectively nonfoamable polyolefinic resins were studied by ASTM
D-4440, “Standard Test Method for Plastics: Dynamic Mechanical Properties Melt Rheology” techniques [1]. The sensitivity of this test method to chain branching of the polymeric molecule was maximized by optimization of the test setup parameters. With the optimized test setup, the melt viscosity, which is also known as complex viscosity, and the viscoelastic properties of storage and loss modulus were measured for the various materials. The functional relationship between the loss tangent, tan d, which is defined as the damping of the material from the loss modulus divided by the storage modulus, and the complex viscosity characterizes each polyolefin material.


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Thermoplastics and thermoplastic materials soften when heated and harden when cooled. They can withstand many heating and cooling cycles and are often suitable for recycling.
Specialty polymers and resins are proprietary polymers, resins, monomers and intermediates. This category includes plastics and elastomers that are based on proprietary curing technologies or chemistries, or that are designed for specialized applications.
Hot melt adhesives are solvent-free chemical compounds that are used to join materials. They can be repeatedly softened by heat and hardened or set by cooling, allowing parts to be removed or repositioned during assembly.
Electrical resins and electronic compounds includes adhesives, greases, pads, stock shapes, tapes, encapsulants, potting compounds, thermal interface materials, and electrically conductive substances used in electrical, electronics, and semiconductor applications.
Conductive adhesives and compounds provide an electrically and/or thermally conductive path between components.
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Product Announcements
Associated Polymer Labs, Inc. - Tri-Blend Polymer Technology for Sale
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Topics of Interest
A great test package, for incoming raw material resins, and to determine the viscosity as a function of temperature. In order to successfully predict the processibility of polymer melts, it is... (Read More)
The Williams, Landel & Ferry model (WLF) uses time-temperature superposition to generate master curves that predict the dynamic behavior of materials at frequencies outside the range of practical... (Read More)
Melt Rheology Testing provides a quick, efficient, accurate, and cost effective means for detecting potential problems in the processing of polyolefin resins, co-polymers, blends, and rheology... (Read More)
In dielectric materials, the loss tangent or loss coefficient is ratio of the imaginary or loss permittivity to the real permittivity of a material. In a capacitive circuit with a sinusoidal or AC... (Read More)
Melt Rheology Testing provides a quick, efficient, accurate, and cost effective means for detecting potential problems in the processing of polyolefin resins, co-polymers, blends, and rheology... (Read More)
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Technical Articles
Predicting Polyolefin Foamability (.pdf) - Plastics, Elastomers and Polymers
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