Water soluble stimuli-responsive star copolymers with multiple encapsulation and release properties
作者:Sandip Das、Dhruba P. Chatterjee、Radhakanta Ghosh、Pradip Das、Arun K. Nandi
DOI:10.1039/c5ra26144a
日期:——
linear water soluble copolymers are synthesised by atom transfer radical polymerization (ATRP) using di(ethylene glycol) methyl ether methacrylate (DEGMA) and 2-(dimethylamino) ethyl methacrylate (DMAEMA). The structure and composition of the block and random copolymers are characterized by 1H NMR spectra and gel permeation chromatography (GPC). The self-assembly of these copolymers, investigated by dynamic
使用二(乙二醇)甲基醚甲基丙烯酸甲酯(DEGMA)和甲基丙烯酸2-(二甲氨基)乙酯(DMAEMA)通过原子转移自由基聚合(ATRP)合成一系列三臂星形(无规/嵌段)和线性水溶性共聚物。嵌段共聚物和无规共聚物的结构和组成的特征在于11 H NMR谱和凝胶渗透色谱法(GPC)。通过动态光散射(DLS)研究,这些共聚物的自组装显示出,在pDEGMA的较低临界溶液温度(LCST)以下,所有共聚物都可溶于水并具有较低的粒径,但在其LCST以上时,粒径特别增加在基本介质中。加入8-苯胺基-1-萘磺酸(ANS)时,其粒径比LCST低约10倍。使用疏水性荧光染料的DLS和荧光研究均显示出温度触发的包封和pH触发的释放。所有共聚物在不同的温度和pH条件下均表现出高度可逆的多重聚集,并且随着介质pH值的降低,聚集所需的温度更高。无规星形共聚物[3-臂-p(DEGMA 40 - co- DMAEMA 18)]在生理条件(37°C和pH
“Controlled” Synthesis and Characterization of Model Methyl Methacrylate/<i>tert</i>-Butyl Methacrylate Triblock Copolymers via ATRP
be explained by the fast initiation coupled with the rapid establishment of the equilibrium between the active and dormant species in the polymerization. Poly(methyl methacrylate) macroinitiators were used to synthesize poly(tBMA-b-MMA-b-tBMA) triblock copolymers in a range of tBMA compositions. The use of a mixed halogen system in the block copolymer synthesis leads to fast initiation and fast deactivation
Smart “All Acrylate” ABA Triblock Copolymer Bearing Reactive Functionality via Atom Transfer Radical Polymerization (ATRP): Demonstration of a “Click Reaction” in Thermoreversible Property
作者:A. Amalin Kavitha、Nikhil K. Singha
DOI:10.1021/ma902203r
日期:2010.4.13
Tailor-made ABAtriblockcopolymers (poly(furfuryl methacrylate)-b-poly(2-ethylhexyl acrylate)-b-poly(furfuryl methacrylate) (FEF)) bearing a reactive pendant furfuryl group were successfully synthesized by atomtransferradicalpolymerization. The chemical compositions were calculated by 1H NMR, and molecular weights and molecular weight distributions were determined by gel permeation chromatography
量身定做的ABA三嵌段共聚物(聚(甲基丙烯酸糠酯) - b -聚(2-乙基己酯) - b -聚(甲基丙烯酸糠酯)(FEF))带有反应性侧基糠基通过原子转移自由基聚合进行了成功地合成。通过1 H NMR计算化学组成,并且通过凝胶渗透色谱分析确定分子量和分子量分布。研究了三嵌段共聚物的拉伸性能,例如拉伸强度,断裂伸长率和拉伸永久变形。差示扫描量热法(DSC)分析和动态力学分析(DMA)表明存在两个玻璃化转变温度(T g),因此存在定义明确的软硬阶段。通过在ABA三嵌段共聚物的反应性糠基基团(diene)与双马来酰亚胺(dienophile)之间进行Diels-Alder反应,成功制备了热可逆自愈材料。通过FTIR和DSC分析确认了聚合物的热可逆性。聚合物的自愈性质通过扫描电子显微镜分析来表征。通过DMA研究彻底研究了Diels-Alder聚合物的粘弹性行为。
End-linked amphiphilic polymer conetworks: Synthesis by sequential atom transfer radical polymerization and swelling characterization
作者:Maria D. Rikkou、Maria Kolokasi、Krzysztof Matyjaszewski、Costas S. Patrickios
DOI:10.1002/pola.23951
日期:2010.5.1
on end‐linked homopolymers and amphiphilic gradient copolymers were synthesized by the atom transfer radical polymerization (ATRP) of 2‐(dimethylamino)ethyl methacrylate (DMAEMA, hydrophilic monomer), methyl methacrylate (MMA, hydrophobic monomer), and ethylene glycol dimethacrylate (EGDMA, hydrophobic cross‐linker). Sequential, rather than step‐wise polymerizations, were performed to enhance the livingness
Synthesis of poly(<i>n</i>
-butyl acrylate) homopolymer and poly(styrene-<i>b</i>
-<i>n</i>
-butyl acrylate-<i>b</i>
-styrene) triblock copolymer via AGET emulsion ATRP using a cationic surfactant
Cationicemulsions of triblockcopolymer particles comprising a poly(n‐butyl acrylate) (PnBA) central block and polystyrene (PS) outer blocks were synthesized by activator generated by electron transfer (AGET) atom transfer radical polymerization (ATRP). Difunctional ATRP initiator, ethylene bis(2‐bromoisobutyrate) (EBBiB), was used as initiator to synthesize the ABA type poly(styrene‐b‐n‐butyl acrylate‐b‐styrene)