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- W2020032390 abstract "Trimethylammonium-2-hydroxypropyl-(TMAHP) spacer was introduced into heparin (H) and the prepared films were characterized by elemental analysis, NMR, SEC-MALS, TG/DTG/DTA, AFM and mechanical tester. When quaternized at the ratio of H/NaOH/alkylating agent/H2O = 0.1-1/0-2/0.1-1/50-500 mmol, H was substituted at A6 and A3 positions. The formation of double-substituted structures by substitution of free hydroxyl group of the previously introduced TMAHP substituent is evident. In the absence of NaOH (H/GTMAC/H2O = 1:1:500) the most drastic decrease of Mn to 8.639 kg/mol and Mw/Mn at 1.48 was observed in comparison to H (Mn = 9532 g/mol with Mw/Mn = 1.38). The film mechanical properties were better on H (E = 4030 MPa; σb = 65 MPa; ɛb = 4.6%) than on quaternized specimens (E = 2500–3340 MPa; σb = 25–40 MPa; ɛb = 1.7–1.8%). The AFM images did not prove relation between mechanical properties and surface shape." @default.
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- W2020032390 date "2015-01-01" @default.
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- W2020032390 title "Cationization of heparin for film applications" @default.
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- W2020032390 doi "https://doi.org/10.1016/j.carbpol.2014.09.021" @default.
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