کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9560433 1381986 2005 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and hydrolytic degradation of aliphatic polyesteramides branched by glycerol
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Synthesis and hydrolytic degradation of aliphatic polyesteramides branched by glycerol
چکیده انگلیسی
A series of branched polyesteramides (PEAs) were synthesized from adipic acid, hexamethylene diamine, 1,4-butanediol and caprolactam by melt polycondensation using glycerol as branching agent. The obtained copolymers, with glycerol contents of 0-0.9 wt% (LPEA-PEAg10) were characterized by FTIR, 1H NMR, DSC and viscometry. The FTIR and 1H NMR spectra demonstrated the formation of ester and amide bonds. DSC data indicated the melting and crystallization temperatures decrease with increasing glycerol content. Water absorption experiments suggested no distinct difference in hydrophilicity between these branched PEAs. Alkaline hydrolysis of PEA films was conducted in pH 11.0 NaOH solution at 37, 50 or 80 °C, respectively. The tests showed that PEAs degraded quickly in alkali and the degradation rate increased with the medium temperature. PEA films underwent slow degradation in pH 7.0 phosphate buffer saline (PBS) at 37 °C. The degradation was monitored by weight loss, viscometry, DSC, FTIR and 1H NMR analysis. The results showed that branching substantially enhanced the degradation. Structural analyses revealed that ester/amide ratio decreased with incubation time, suggesting the degradation occurs mainly on the ester bonds. During the degradation, the melt temperature and crystallinity of the copolymers increased slightly with the degradation time.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 88, Issue 2, May 2005, Pages 309-316
نویسندگان
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