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- W2364827149 abstract "A linear polyether amine (PEA) was synthesized by ring-opening polymerization using ethylene diamine, 2-chloroethanol and epoxy chloropropane. PEA was then cross-linked with diisocyanates to produce crosslinkable polymers, P1A, P1, P1B and P2. The synthesized crosslinkable polyurethanes were characterized by IR and 1H-NMR spectra, and their thermal stabilities and degradabilities were investigated by TG and DSC. Their biodegradabilities were studied in PBS aqueous buffer (pH 7.42) in the presence of papain. The results showed that the thermal degradation of polymers mainly consisted of two stages: the first weight loss should be due to the break of amide bond in the polymers, during which the temperatures at the maximum weight loss rate for P1A, P1, P1B and P2 were 337.3, 367.6, 372.7 and 367.4℃ respectively; the second weight loss should be due to the break of main chain of PEA, the temperatures at the maximum weight loss rate for P1A, P1, P1B and P2 were 440.5, 422.5, 444.9 and 482.7℃ respectively. The weight loss for P1 was over 40% in aqueous buffer in the presence of papain after 60 d. The biodegradation rates of polymers decreased when the quantities of cross-linking agents increased." @default.
- W2364827149 created "2016-06-24" @default.
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- W2364827149 date "2009-01-01" @default.
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- W2364827149 title "Synthesis and Performance of Degradable PEA-based Polyurethane" @default.
- W2364827149 hasPublicationYear "2009" @default.
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