Novel supramolecular block copolymer containing organic–inorganic pentablock copolymer by ATRP of styrene and vinyl acetate using polydimethylsiloxane/ cyclodextrin inclusion complexes as macroinitiator

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 Novel supramolecular block copolymer containing organic–inorganic pentablock copolymer by ATRP of styrene and vinyl acetate using polydimethylsiloxane/ cyclodextrin inclusion complexes as macroinitiator دارای ۲ صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است

فایل ورد Novel supramolecular block copolymer containing organic–inorganic pentablock copolymer by ATRP of styrene and vinyl acetate using polydimethylsiloxane/ cyclodextrin inclusion complexes as macroinitiator  کاملا فرمت بندی و تنظیم شده در استاندارد دانشگاه  و مراکز دولتی می باشد.

توجه : در صورت  مشاهده  بهم ریختگی احتمالی در متون زیر ،دلیل ان کپی کردن این مطالب از داخل فایل ورد می باشد و در فایل اصلی Novel supramolecular block copolymer containing organic–inorganic pentablock copolymer by ATRP of styrene and vinyl acetate using polydimethylsiloxane/ cyclodextrin inclusion complexes as macroinitiator،به هیچ وجه بهم ریختگی وجود ندارد

بخشی از متن Novel supramolecular block copolymer containing organic–inorganic pentablock copolymer by ATRP of styrene and vinyl acetate using polydimethylsiloxane/ cyclodextrin inclusion complexes as macroinitiator :

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چکیده مقاله:

Organic–inorganic pentablock copolymers have been synthesized via ATRP of styrene and vinyl acetate monomers at 60°C using CuCl/PMDETA as a catalyst system initiated from boromoalkyl-terminated PDMS/cyclodextrins macroinitiator. Br-PDMS-Br was reacted with -CD in different conditions with inclusion complexes being characterized through 1H-NMR) and DSC. Resulting Br-PDMS-Br/c-CD inclusion complexes were taken as macroinitiators for ATRP of St and VAc. Well-defined PSt-b- PVAc-b-PDMS/c-CD-b-PVAc-b-PSt pentablock copolymer was characterized by 1H-NMR, gel permeation chromatograph (GPC) and DSC. There was a good agreement between the number-average molecular weight calculated from 1H NMR spectra and that of theoretically calculated. Pentablock copolymers consisting of Br-PDMS-Br/c-CD inclusion complex as central blocks (inorganic block) and PVAc and PSt as terminal blocks were synthesized by this technique. PSt-b-PVAc-b-PDMS/c-CD-b-PVAc-b-PSt pentablock copolymer can undergo a temperature-induced reversible transition upon heating of the copolymer complex from white complex at 22°C to green complex in 55°C which characterized with XRD and 1H NMR. XRD showed a change in crystallinity percent of St peak with changing the temperature which calculated by Origin75 software