کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10609888 984736 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of natural rubber-based telechelic cis-1,4-polyisoprenes and their use to prepare block copolymers via RAFT polymerization
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Synthesis of natural rubber-based telechelic cis-1,4-polyisoprenes and their use to prepare block copolymers via RAFT polymerization
چکیده انگلیسی
A new trithiocarbonate functionalized cis-1,4-polyisoprene was obtained from oxidative degradation of natural rubber followed by reductive amination and amidation. The structure of the resulting functionalized cis-1,4-polyisoprene was confirmed by a combination of 1H NMR spectroscopy, 13C NMR spectroscopy, MALDI-TOF mass spectrometry and FTIR spectroscopy. 1H NMR spectroscopy showed that the trithiocarbonate functionality was equal to one. The well-defined trithiocarbonyl-end functionalized cis-1,4-polyisoprene was used as a macromolecular chain transfer agent (macroCTA) to mediate the RAFT polymerization of t-BA using AIBN as the initiator ([t-BA]0/[macroCTA]0/[AIBN]0 = 250/1/0.2) in toluene at 60 °C. The resulting PI-b-P(t-BA) diblock copolymer presents an unimodal SEC trace shifted toward higher molecular weight in comparison with the SEC trace of the macroCTA, indicating that the polymerization of the second block is effective. The characteristics of the copolymer were determined by SEC (M¯n = 26,000 g mol−1, PDI = 1.76) and 1H NMR spectroscopy (DP¯n (PI) = 62 and DP¯n (P(t-BA)) = 87).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 47, Issue 5, May 2011, Pages 1151-1159
نویسندگان
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