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《Journal of Functional Polymers》 1989-01
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Effect of Surface Properties on Blood Compatibility of Polyether Polyester Block Copolymer

Wang Shen-guo;Guo Ke-zhen;Li Xue-fen Institute of Chemistry,Academia Sinica  
Blood compatibility of polymer will be strongly influenced by surface propertics andstructure of the polymer. In the present study contact angle, water sorption and X-rayphotoelectron spectroscopy (XPS) were tested in order to characterize the surface compo-sition and microphase separated structure of blended polyether polyester block copolym-er (BPEE) composed of PTMGT-PET and PEGT-PET. XPS spectra show that the ra-tio of oxygen content to carbon content (O / C) in the air-sample interface is higher thanthat of in bulk. The ether bond had diffused toward the surface was revealed. And thesurface composition was evaluated from O / C. It was found that there are similar rela-tionship between O / C shifting and blood compatibility with increasing of PEGT com-ponent. The largest contact angle, the highest value of [O / Cl_(surface)/ [O / C]_(bulk), the bestblood compatility and the more tiny microphase separated strrcture were found out inBPEE(60/ 40) which composed PTMGT/ PEGT=60/ 40. So that the bloodcomposibility of BPEE was affected mainly by the surface composition, the surface freeenergy of each segment and the state of microphase separation.
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