Easy Access to Amphiphilic Heterografted Poly(2-oxazoline) Comb Copolymers

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• 作者：Christine Weber ; Michael Wagner ; Duygu Baykal ; Stephanie Hoeppener ; Renzo M. Paulus ; Grit Festag ; Esra Altuntas ; Felix H. Schacher ; Ulrich S. Schubert
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：July 9, 2013
• 年：2013
• 卷：46
• 期：13
• 页码：5107-5116
• 全文大小：511K
• 年卷期：v.46,no.13(July 9, 2013)
• ISSN：1520-5835

文摘

A series of heterografted polymers with a polymethacrylate backbone and varying composition of oligomeric 2-oxazoline side chains was synthesized by copolymerization of oligo(2-ethyl-2-oxazoline)methacrylate and oligo(2-n-nonyl-2-oxazoline)methacrylate (ONonOx) macromonomers using the reversible addition鈥揻ragmentation chain transfer (RAFT) technique. Kinetic studies revealed pseudofirst order kinetics, PDI values below 1.3, and a slight enrichment of ONonOx side chains toward the end of the reaction. The heterografted comb polymers were characterized by means of ¹H NMR spectroscopy (0 to 100 mol % ONonOx) and size exclusion chromatography. Differential scanning calorimetry and wide-angle X-ray scattering revealed partial crystallinity of the lateral n-nonyl chains within the ONonOx domains. Depending on the composition of the amphiphilic copolymer, the comb polymers either formed unimers or aggregated (super)structures in water, methanol, and ethanol, as investigated by dynamic light scattering and cryo-transmission electron microscopy.