کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5189716 1381190 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Helical conformation of the copolymers of l-proline derivatives based propargylether and chiral N-propargylamide
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Helical conformation of the copolymers of l-proline derivatives based propargylether and chiral N-propargylamide
چکیده انگلیسی
The novel acetylene monomers, l-proline derivatives based propargylethers PR (PA, PC, and PL) were synthesized by alkylation of Boc-hydroxyproline with propargyl bromide and acylation of achiral amine. The homopolymers of the novel acetylene monomer exist in no regulated higher order structure in solvents because of the lack of hydrogen bond and the unique ring structure in the pendant. Consequently, the copolymerization of l-proline-derived chiral propargylether PR with the l-alanine-derived N-propargylamide (LA) was formed and the chiroptical properties of the formed copolymers were examined. We conclude that (1) N-H of the amide group at 2-position in proline play an important role in the formation of helical conformation of poly(LA88-co-PR12); (2) improving the amount of PC of poly(LA-co-PC) changes the conformation of the copolymer in CHCl3 and perturbs the leadership of LA; (3) the conformation of poly(LA75-co-PC25) remarkably changes with changing temperature and PC obtains the leadership in the competition on the conformation of poly(LA75-co-PC25) in CHCl3 with the improvement of temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 19, 10 September 2007, Pages 5696-5701
نویسندگان
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