The effects of isotactic polypropylene (PP) on the rheological properties of ultra high molecular weight polyethylene (UHMWPE) have been measured in a broad range of composition (0, 5, 15, 30 wt% PP) at various temperatures (110, 130, and 150°C) and a specific gel concentration of 6 wt%. The result showed that the viscosity of the UHMWPE significantly decreased with the addition and increasing amount of PP. Regardless of temperature, the viscosity function followed the power‐law behavior. Copyright © 2009 John Wiley & Sons, Ltd.

Polyurethane dispersions (PUDs) have been designed and synthesized based on different types of soft segments, namely, poly(2,4-diethyl-1,5-pentamethylene adipate) glycol (PDPAD; M n ¼ 1000) and poly(2,4-diethyl-1,5-pentamethylene-1,4-cyclohexane dicarboxylate) glycol (PDPCD; M n ¼ 1000), and were subsequently modified with fluoro oligomer (BA-N fluoroalcohol). It was found that the PDPCD segments improved the hydrolytic stability, whereas the contact angle with water drop was signifi-cantly increased with the addition and increasing amount of Zonyl for PDPAD-based PU and it was marginally increased with PDPCD-based PU. In addition, the PDPCD provided PUD with enhanced mechanical properties compared with the PDPAD.

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