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Cyclodextrin-Overhanging Hyperbranched Core-Double-Shell Miktoarm Architectures: Synthesis and Gradient Stimuli-Responsive Properties  
Cyclodextrin-Overhanging Hyperbranched Core-Double-Shell Miktoarm Architectures: Synthesis and Gradient Stimuli-Responsive Properties
資料類型: PDF文件
關鍵詞: core-double-shell  architectures  core-shell  polymers  hyperbranched  miktoarm  stimuli-responsive  
stimulisensitive  polymers  β-cyclodextrin  
資料大小: 988k
所屬學科: 功能高分子
來源: 來源網絡
簡介:
We report the synthesis and gradient stimuliresponsive properties of cyclodextrin-overhanging hyperbranched core-double-shell miktoarm architectures. A ionic hyperbranched poly(b-cyclodextrin) (b-CD) core was firstly synthesized via a convenient ‘‘A2þB3’’ approach. Double-layered shell architectures, composed of poly(N-isopropyl acrylamide) (PNIPAm) and poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) miktoarms as the outermost shell linked to poly( N,N-diethylaminoethyl methacrylate) (PDEAEMA) homoarms which form the inner shell, were obtained by a sequential atom transfer radical polymerization (ATRP) and parallel click chemistry from the modified hyperbranched poly(b-CD) macroinitiator. The combined characterization by 1H NMR, 13C NMR, 1H-29Si heteronuclear multiple-bond correlation (HMBC), FTIR and size exclusion chromatography/multiangle laser light scattering (SEC/MALLS) confirms the remarkable hyperbranched poly(b-CD) core and double-shell miktoarm architectures. The gradient triple-stimuli-responsive properties of hyperbranched core-double-shell miktoarm architectures and the corresponding mechanisms were investigated by UV–vis spectrophotometer and dynamic light scattering (DLS). Results show that this polymer possesses three-stage phase transition behaviors. The first-stage phase transition comes from the deprotonation of PDEAEMA segments at pH 9–10 aqueous solution under room temperature. The confined coil-globule conformation transition of PNIPAm and PDMAEMA arms gives rise to the second-stage hysteretic cophase transition between 38 and 44 C at pH 10. The third-stage phase transition occurs above 44 C at pH ¼ 10 attributed to the confined secondary conformation transition of partial PDMAEMA segments. This cyclodextrin-overhanging hyperbranched core-double-shell miktoarm architectures are expected to solve the problems of inadequate functionalities from core layer and lacking multiresponsiveness for shell layers existing in the dendritic core-multishell architectures.
上傳人: fanxd
上傳時間: 2012-12-04 11:16:12
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