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TECHNOLOGY | FOAMS


Ionic crosslinking Total Cray Valley continues with development work on the use of its Dymalink acrylate functional zinc salt additives to increase the melt strength of PP through ionic crosslinking during extrusion. The company is in the early stages of developing new applications, with customer validation continuing, says Dr Philippe Lodefier, EU R&D Director. According to Application Chemist Brett Robb,


speaking at the US Polymer Foam conference, polar ionic groups created in the polymer tend to cluster together, away from the non-polar back- bone chains, creating entanglements. The salts do not affect melting properties, however. Dymalink has been used in foams using physical and chemical blowing agents. In physical foaming, it helps stabilise extrusion, produces a more uniform skin, and results in foams with a higher, more homogeneous cell density. With chemical blowing agents, the key differences are a lower density, and smaller, more homogeneous cells. Braskem added its own branched HMS-PP a


High melt strength and extensibility of Borealis HMS PP grades allows tailoring of foam properties by adding linear polymer component while keeping good foamability. Charts show force versus drawdown (top) and tensile modulus versus density (bottom)


Source: Borealis


little over two years ago, launching the Amppleo family at K2016. One grade, Amppleo 1025MA, is said to offer a unique combination of high melt strength (50cN) and high stiffness (2.27GPa). It is intended for low density foam applications for the automotive and packaging market segments, according to the company. Braskem says Amppleo HMS-PP products are designed to be used in low and medium density foam applications and with multiple physical and chemical blowing agents. The technology has been demonstrated on tandem and inline extrusion processes.





Microphotographs showing foam cell structure of Braskem bio-based LDPE (SLD4004) and a conventional petrochemical-based equivalent (LDF2023) foamed using two different blowing agents (Ecofil P20 from Polyfil and Safoam FPE-20 from Reedy Chemical Foam) at 0.2 and 0.6%. Results are very similar


56 COMPOUNDING WORLD | January 2019


Source: Braskem www.compoundingworld.com


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