Keys to improved performance of new Uniprene® XL elastomers are: 1) a rubber component different from those in other TPVs; and 2) a unique dual-network morphology, shown in schematic. At left, micro-sized domains of cross-linked rubber are shown in polypropylene matrix. At right, magnification of one rubber domain shows soft-segment crosslinking plus nano-sized polystyrene hard segments, also crosslinked. Illustration courtesy of Teknor Apex

PAWTUCKET, RI, USA -- (Jobwerx News) -- FOCUS: Polymer Chemistry -- New thermoplastic vulcanizate (TPV) elastomers from Teknor Apex's Thermoplastic Elastomer Division, provides greater long-term resistance to heat and solvents than conventional TPV compounds, higher tensile strength, and better long-term elastic recovery.

Measured by compression set, elastic recovery properties of conventional TPVs deteriorated by 20 to 50% after long-term exposure at 125 deg. C, while new Uniprene (R) XL compounds exhibited a change of only 5%, were conducted in comparative tests by Teknor Apex.

These new TPVs also exhibited substantially lower weight gain after over 500 hours of immersion in IRM 903 oil at 125 deg. C. Their tensile strength values were typically 10 to 20% greater.

A spokesperson for Teknor Apex revealed that "Uniprene XL compounds are even more rubber-like than conventional TPVs, enabling processors to meet more stringent requirements for dynamic components that undergo repeated flexure or for applications in aggressive end-use environments." "Unlike specialty TPVs that cost many dollars per pound more than conventional TPV compounds, the new XL series provides enhanced performance at only a small premium."

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