Synthesis of Degradable Miktoarm Star Copolymers via Atom Transfer Radical Polymerization
作者:Haifeng Gao、Nicolay V. Tsarevsky、Krzysztof Matyjaszewski
DOI:10.1021/ma0503099
日期:2005.7.1
experimental conditions for the synthesis of the multifunctional star initiators and the miktoarm star copolymers. During the synthesis of miktoarm star copolymers, both interstar and intrastar arm−arm couplings were observed. The initiating efficiency of the alkyl bromide sites in the core of the star polymers was determined by analysis of the linear block copolymers, obtained after cleavage of the
Combining Atom Transfer Radical Polymerization and Disulfide/Thiol Redox Chemistry: A Route to Well-Defined (Bio)degradable Polymeric Materials
作者:Nicolay V. Tsarevsky、Krzysztof Matyjaszewski
DOI:10.1021/ma050020r
日期:2005.4.1
(ATRP) of methyl, tert-butyl, and benzyl methacrylate using bis[2-(2-bromoisobutyryloxy)ethyl] disulfide as the initiator and CuBr/2,2‘-bipyridine as the catalyst at 50 °C. The disulfide bond was cleaved to thiol by reduction with tributylphosphine, yielding polymers of half the molecular weight of the starting materials. Degradable gels were prepared by the copolymerization of methylmethacrylate and a
measurements. The results demonstrated that the sizes of poly(ionicliquid) (PIL)-based nanogels can be tuned by the feed ratio of the monomers and DSDMA. Moreover, the redox-response performances of these nanogels were evaluated through the size variation in the presence of dithiothreitol (DTT) and benzoyl peroxide (BPO). The capability of PIL-based nanogels for controlled release was also investigated by
对于解决细胞内和细胞外屏障的新型和多功能递送系统,独特的二硫键化学已被广泛探索。在这项研究中,通过基于离子液体(IL)的单体1,正丁基二溴3,3'-双-1-乙烯基咪唑二溴化物([C n VIm] Br,n = 4、6),以及在选择性溶剂中的二硫化二甲基丙烯酸二甲酯(DSDMA)。使用扫描电子显微镜(SEM),傅立叶变换红外(FTIR)光谱,热重分析(TG),动态激光散射(DLS)和Zeta(ζ)对合成后的纳米凝胶进行表征)电位测量。结果表明,可以通过单体和DSDMA的进料比来调节基于聚(离子液体)(PIL)的纳米凝胶的尺寸。此外,通过在二硫苏糖醇(DTT)和过氧化苯甲酰(BPO)存在下的尺寸变化来评估这些纳米凝胶的氧化还原响应性能。通过使用罗丹明B(RhB)作为原型模型药物,还研究了基于PIL的纳米凝胶的控释能力。发现可以通过DTT触发释放RhB。因此,可以通过基于PIL的纳米凝胶方便地制
Functional, star polymeric molecular carriers, built from biodegradable microgel/nanogel cores
作者:Jay A. Syrett、David M. Haddleton、Michael R. Whittaker、Thomas P. Davis、Cyrille Boyer
DOI:10.1039/c0cc04532b
日期:——
Acid and disulfide biodegradable cross-linkers have been employed to generate microgel star polymers, using RAFT-polymer arms. RAFT end-groups were then exploited to attach functional compounds via both thiol-ene and thiol-pyridyl disulfide exchange reactions.
DNA Polyplexes Formed Using PEGylated Biodegradable Hyperbranched Polymers
作者:Lei Tao、William C. Chou、Beng H. Tan、Thomas P. Davis
DOI:10.1002/mabi.200900378
日期:2010.6.11
A novel PEGylatedbiodegradablehyperbranched PEG‐b‐PDMAEMA has been synthesized. The low toxicity, small molecular weight PDMAEMA chains were crosslinked using a biodegradable disulfide‐based dimethacrylate (DSDMA) agent to yield higher molecular weight hyperbranchedpolymers. PEG chains were linked onto the polymer surface, masking the positive charge (as shown by Zeta potential measurements) and
合成了一种新型的PEG化可生物降解的超支化PEG- b - PDMAEMA。使用可生物降解的二硫基二甲基丙烯酸酯(DSDMA)试剂将低毒性,小分子量的PDMAEMA链交联,以生产更高分子量的超支化聚合物。PEG链连接到聚合物表面,掩盖了正电荷(如Zeta电势测量所示)并降低了聚合物的毒性。还在还原条件下裂解了超支化结构并进行了分析,从而确认了预期的组分结构。将超支化聚合物与DNA混合,并通过静电相互作用显示出有效的结合。超支化结构可以容易地还原,产生较低毒性的低聚物链。