【摘 要】
：
Simply constructing multiple responsive polymers with obvious shape and dimension variations on their assemblies upon different stimuli is still rarely reported
【机 构】
：
Shanghai Key Laboratory of Advanced Polymeric Materials,Key Laboratory for Ultra fine Materials of M
论文部分内容阅读
Simply constructing multiple responsive polymers with obvious shape and dimension variations on their assemblies upon different stimuli is still rarely reported.In this study,we report a hyperbranched polymer named HPAzoBAHB-star-PEG9 with quadruple-response to light,temperature,pH and oxidation stimuli.The polymer contains azobenzene chromophore,sulfide,amide and amine groups in its hydrophobic hyperbranched core,and the core is capped with hydrophilic polyethylene glycol(PEG9)arms.HPAzoBAHB-star-PEG9 could assemble into unusual leaf-like lamellar micelles at 25℃under the guidance of orderly arranged H-aggregate of azobenzene moieties.These leaf-like lamellar micelles can transform into vesicles upon UV irradiation and lower temperature,or convert to smaller spherical micelles in acidic or oxidative environments,respectively,with the destroy of ordered azobenzene arrangements.This quadruple-responsive hyperbranched polymer is suitable to construct multiple stimuli-responsive micro/nanostructures,or accurate delivery and release following subtle stimuli sequences.
其他文献
在自复位结构中设置耗能器能够耗散地震能量、减轻结构构件的损伤,地震后更换耗能器即可快速恢复结构的抗震性能。文中提出一种采用高强螺栓装配到梁柱节点中的屈曲约束折形叠合耗能器,便于施工连接和震后更换。耗能器将节点的耗能集中在耗能芯板,通过附加约束装置防止芯板屈曲,同时耗能器能够作为梁翼缘的加强板以及节点的抗剪连接装置。对该耗能板进行轴向拉压试验,考察了其耗能能力、刚度、承载力和连接强度等,采用有限元软件ABAQUS进行模拟对比分析,结果表明,在保证连接装置强度的前提下,屈曲约束折形叠合耗能板具有较好的耗能能力
Polymerization-induced self-assembly(PISA)is an emerging method for the preparation of block copolymer nano-objects at high concentrations.However,most PISA for
Hybrids,produced by hybridization of proteins,peptides,DNA,and other new biomolecules with polymers,often have unique functional properties.These properties,suc
以Landsat8数据和"珞珈一号"夜光数据为主要数据源,将遥感与地理信息科学技术相结合,对合肥建成区进行提取。首先将Landsat8相应波段分别与自身第8波段进行Gram-Schmidt变换处理,并对处理获取的新波段进行波段计算,获取土壤调节植被指数(SAVI)、改进的归一化差异水体指数(MNDWI)和改进的归一化裸露指数(MNDBI),分别代表植被、水体、建成区三类主要的土地覆盖类型,将三指数
为了深入地了解热带山地雨林原始林与次生林叶氨基酸对氮添加的响应和适应机制,以海南尖峰岭热带山地雨林原始林和次生林的林下常见植物为研究对象,通过设置对照CK(0 kg N/(ha·a))、中氮添加M(50 kg N/(ha·a))和高氮添加H(100 kg N/(ha·a))3种氮添加处理的实验,探究氮添加对林下灌木叶片氨基酸含量的影响。实验结果表明,无氮添加时,原始林与次生林的总氨基酸含量和水解氨基酸含量无显著差异,原始林游离氨基酸总含量显著高于次生林;中氮添加时,次生林林下灌木叶氨基酸含量的响应程度高于
对青海28批不同地区藏药细果角茴香中16种微量元素的含量进行了测定。采用系统聚类分析表明:藏药细果角茴香的生长与繁殖受高原海拔制约,并以海拔3200m为界分两类;道地药材分布地区与15种所测元素呈现关联。此结果为今后藏药细果角茴香的规范化种植、原产地保护及产业化开发提供理论依据。
Mimicking the complex structure of natural bone remains a challenge for bone tissue scaffolds.In this study,a novel processing strategy was developed to prepare the bone-like scaffolds that are featured by highly oriented and fully interconnected pores.Th
通过一步水热法制备的In2S3-ZnIn2S4光动力抗菌试剂,能在可见光照射下产生强氧化性的活性氧(ROS),ROS能够通过不可逆的氧化损伤过程诱导细菌死亡。通过体外亚甲基蓝降解实验探究其光动力产生ROS性能,并以大肠杆菌和金黄葡萄球菌为模型探究其光动力抗菌性能。所制备的花状结构的In2S3-ZnIn2S4纳米结构带隙为2.3eV,
Photoenzymatic reversible addition-fragmenatation chain transfer(RAFT)emulsion polymerization,surfactant-free or ab initio,of various monomers is reported with
“互联网+”时代的发展,开启了混合教学模式的新思路,我校以学习通为智能终端主体开展了各种类型的翻转课堂教学模式,它打破了原有的教师满堂灌的传统教学思想,实现了以学生