کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5204499 | 1381963 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Copolymer of tetraethylenepentamine and ethylene glycol diacrylate: Synthesis and degradation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Copolymer of tetraethylenepentamine and ethylene glycol diacrylate: Synthesis and degradation Copolymer of tetraethylenepentamine and ethylene glycol diacrylate: Synthesis and degradation](/preview/png/5204499.png)
چکیده انگلیسی
A degradable polycation with high density of discrete charge was synthesized from tetraethylenepentamine (TEPA) and ethylene glycol diacrylate (EGDA) based on Michael addition and amidation. The cationic polymer synthesized here was denoted as PTE. Polymerization was monitored by 1H NMR spectroscopy. According to 1H NMR spectra, Michael addition proceeded more rapidly than amidation. After 6 h, there were no double bonds left, while amidation existed throughout the polymerization. In addition, when PTE was synthesized in chloroform and dichloromethane, respectively, there were some structural differences as shown by 1H NMR spectroscopy. The degradation laws of PTE in aqueous solution were studied by 1H NMR and viscosity measurements. When PTE was dissolved in deionized water, degradation proceeded in high velocity. However, in NaH2PO4 aqueous solution, degradation was slowered. Degradation at 37 °C proceeded obviously more rapidly than that at 25 °C. A certain degree of amidation facilitated the reduction of degradation velocity. The effect of concentration on degradation was not obvious. Interestingly, PTE synthesized in CHCl3 was degraded more rapidly than that in CH2Cl2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 93, Issue 5, May 2008, Pages 932-940
Journal: Polymer Degradation and Stability - Volume 93, Issue 5, May 2008, Pages 932-940
نویسندگان
Chuan-Bao Wu, Jian-Yuan Hao, Xian-Mo Deng, Xiao-Hong Li,