کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5189739 | 1381191 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The chemoenzymatic synthesis of AB-type diblock copolymers from a novel bifunctional initiator
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A novel bifunctional initiator 2,2,2-trichloroethanol (TCE) is used for the chemoenzymatic synthesis of AB-type diblock copolymer polycaprolactone-block-polystyrene (PCL-b-PSt) by combination of two fundamentally different synthetic techniques: enzymatic ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) and atom transfer radical polymerization (ATRP) of styrene (St). The kinetic study on the TCE-initiated enzymatic ROP of ε-CL in the presence of the biocatalyst Novozyme-435 was investigated. By optimization of the reaction conditions, TCE quantitatively initiated enzymatic ROP of ε-CL. Trichloromethyl-terminated PCL macromolecules prepared in this way were subsequently employed as macroinitiators in the ATRP of St using CuCl/2,2â²-bipyridine as the catalyst system to afford well-defined AB-type diblock copolymers PCL-b-PSt. The kinetic analysis of ATRP indicated a 'living'/controlled radical polymerization. The polymeric nanospheres were prepared by the precipitation method from two resulting PCL-PSt diblock copolymers with different content ratio of PSt to PCL. It was determined by DLS and AFM that two different diameter nanospheres had been obtained.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 12, 31 May 2006, Pages 4292-4299
Journal: Polymer - Volume 47, Issue 12, 31 May 2006, Pages 4292-4299
نویسندگان
Ke Sha, Dongshuang Li, Yapeng Li, Peng Ai, Wei Wang, Yaxin Xu, Xiaotian Liu, Mingzhi Wu, Shuwei Wang, Bao Zhang, Jingyuan Wang,