کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5211219 | 1382940 | 2008 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Convenient approaches for the synthesis and characterization of well-defined linear-dendritic diblock copolymers having a definite number of peripheral primary amino groups: Exact control of numbers introduced and dendritic distribution to enhance co-oper
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Convenient approaches for the synthesis and characterization of well-defined linear-dendritic diblock copolymers having a definite number of peripheral primary amino groups: Exact control of numbers introduced and dendritic distribution to enhance co-oper Convenient approaches for the synthesis and characterization of well-defined linear-dendritic diblock copolymers having a definite number of peripheral primary amino groups: Exact control of numbers introduced and dendritic distribution to enhance co-oper](/preview/png/5211219.png)
چکیده انگلیسی
Efficient and convenient approaches have been developed to prepare a wide array of well-defined linear-dendritic diblock copolymers having a definite number of peripheral primary amino groups by utilizing linear polystyrenes end-functionalized with a definite number of dendritic benzyl bromide and/or benzyl alcohol functionalities as precursory polymers. Various approaches including modified Gabriel synthesis, Michael addition and alkylation reactions have been developed for their synthesis. The resulting primary amine-end-functionalized copolymers always exhibited SEC profiles showing asymmetric long-tailed distributions and their true molar masses were obtained after the acetylation of their peripheral dendritic amino groups with acetyl chloride. All the resulting copolymers possessed well-defined linear-dendritic diblock architectures, with controlled molecular weights. In these polymer series, the molecular weight of linear polystyrene chains remained almost unchanged (Mn â¼Â 19.3 kg/mol), while the dendritic blocks increased in both size and molecular weight as the number of peripheral dendritic end-functional groups was increased. The resulting copolymers were fully characterized by elemental, FT-IR, TLC-FID, GPC, 1H and 13C NMR analyses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reactive and Functional Polymers - Volume 68, Issue 12, December 2008, Pages 1682-1695
Journal: Reactive and Functional Polymers - Volume 68, Issue 12, December 2008, Pages 1682-1695
نویسندگان
Ashraf A. El-Shehawy, Kenji Sugiyama, Akira Hirao,