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A polymer admixture is formed from a base polymer and thermoplastic copolymer additive including polar hard segments and polar and nonpolar soft blocks in graft or block copolymer form. The polymer admixture is characterized by increased contact angle hysteresis and is formed into blood and tissue-c

A polymer admixture is formed from a base polymer and thermoplastic copolymer additive including polar hard segments and polar and nonpolar soft blocks in graft or block copolymer form. The polymer admixture is characterized by increased contact angle hysteresis and is formed into blood and tissue-contacting surfaces of a biomedical device or into textiles. A preferred additive comprises a segmented block copolymer having polydialkylsiloxanes as nonpolar soft blocks, and a polyurethane as hard segments and a polyalkylene oxide as a polar soft block.

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A modified, solid polymer formed of a base polymer and a solid thermoplastic segmented block copolymer additive blended with said base polymer, said additive comprising an essentially linear segmented copolymer chain; said additive characterized by a gc less than said base polymer and said segmented

A modified, solid polymer formed of a base polymer and a solid thermoplastic segmented block copolymer additive blended with said base polymer, said additive comprising an essentially linear segmented copolymer chain; said additive characterized by a gc less than said base polymer and said segmented copolymer chain characterized by the presence of at least one polar hard segment having a glass transition temperature or crystalline melting temperature above 37°C., and a nonpolar soft block having a glass transition temperature below 37°C. said additive further comprising a second essentially linear polymer chain chemically bonded to said segmented copolymer chain, said second polymer chain being selected from a polar homopolymer or a second segmented copolymer, said second segmented copolymer or polar homopolymer characterized by the presence of at least one second polar hard segment having a glass transition temperature or crystalline melting temperature above 37°C., said polar hard segments independently selected from the group consisting of a polyurethane and a polyurethaneurea, and said second segmented copolymer further characterized by the presence of a polar soft block having a glass transition temperature or crystalline melting temperature below 37°C. with the proviso that said base polymer is not a polycarbonate of 4,4′-diphenyldimethylmethane.