کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5157612 | 1500588 | 2017 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Self-assembly of maltoheptaose-b-PMMA block copolymer systems: 10Â nm Resolution in thin film and bulk states
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This paper describes the self-assembly of oligosaccharide-based hybrid block copolymers (BCPs) consisting of maltoheptaose (MH) and poly(methyl methacrylate) (PMMA) into 10Â nm scale lamellar and cylindrical phases depending on the volume fractions of MH (ÏMH) and the annealing process. Time resolved SAXS study of the BCP bulk samples during thermal annealing indicated that the BCPs phase separate into 10Â nm scale periodical structures. The solvent vapor annealing induced self-organizations of the BCP into different phases depending on ÏMH and the weight fraction of THF/H2O. BCPs with relatively higher ÃMH, MH-b-PMMA3k (ÏMHÂ =Â 0.27) and MH-b-PMMA5k (ÏMHÂ =Â 0.16) self-organized into lamellar phases while the BCP sample with relatively lower ÏMH, MH-b-PMMA9k (ÏMHÂ =Â 0.10), self-organized into cylindrical phase by using THF/H2OÂ =Â 1/4 (w/w). On the other hand, the solvent vapor annealing with larger fraction of THF, i.e. THF/H2OÂ =Â 2/3 (w/w), induced cylindrical phases for MH-b-PMMA3k and MH-b-PMMA5k.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 170, 15 August 2017, Pages 15-22
Journal: Carbohydrate Polymers - Volume 170, 15 August 2017, Pages 15-22
نویسندگان
C.M. Noronha, I. Otsuka, C. Bouilhac, C. Rochas, P.L.M. Barreto, R. Borsali,