开发了一种新的合成方法,该方法可通过RAFT聚合方法,通过“ R基团法”在苯乙烯聚合物上制备接枝共聚物。通过这种方法,首先将苯乙烯聚合物的潜在位点溴化,然后将吡唑和硫代十二烷基作为Z基团转化为大分子RAFT剂。它用于合成接枝共聚物,例如聚苯乙烯-接枝-聚甲基丙烯酸甲酯(PS- g - PMMA),聚苯乙烯-接枝-聚(丙烯酸异冰片酯),聚苯乙烯-接枝-聚[2-(乙酰乙酰氧基)甲基丙烯酸乙酯](PS- g- PAEMA)和聚对-甲氧基苯乙烯-接枝-聚苯乙烯(P(p- MS)-g‐PS)。通过凝胶渗透色谱,1 H NMR,IR和原子力显微镜(AFM)表征聚合物。使用原子力显微镜研究了THF中PS- g - PMMA的形态,并发现了岛状特征。PS- g - PAEMA接枝共聚物的AFM研究揭示了小球的形成和带状形态特征。PS- g - PAEMA接枝共聚物与二甲基甲酰胺中的Fe(III)形成络合物
preparing graftcopolymersviaRAFTpolymerization method by the “R group approach” ontostyrenicpolymers. In this approach, latent sites of the styrenicpolymer was brominated first and then converted into macro‐RAFT agents with pyrazole and thio dodecyl as the Z groups. This was used to synthesize graftcopolymer such as polystyrene‐graft‐polymethyl methacrylate (PS‐g‐PMMA), polystyrene‐graft‐poly(isobornyl
开发了一种新的合成方法,该方法可通过RAFT聚合方法,通过“ R基团法”在苯乙烯聚合物上制备接枝共聚物。通过这种方法,首先将苯乙烯聚合物的潜在位点溴化,然后将吡唑和硫代十二烷基作为Z基团转化为大分子RAFT剂。它用于合成接枝共聚物,例如聚苯乙烯-接枝-聚甲基丙烯酸甲酯(PS- g - PMMA),聚苯乙烯-接枝-聚(丙烯酸异冰片酯),聚苯乙烯-接枝-聚[2-(乙酰乙酰氧基)甲基丙烯酸乙酯](PS- g- PAEMA)和聚对-甲氧基苯乙烯-接枝-聚苯乙烯(P(p- MS)-g‐PS)。通过凝胶渗透色谱,1 H NMR,IR和原子力显微镜(AFM)表征聚合物。使用原子力显微镜研究了THF中PS- g - PMMA的形态,并发现了岛状特征。PS- g - PAEMA接枝共聚物的AFM研究揭示了小球的形成和带状形态特征。PS- g - PAEMA接枝共聚物与二甲基甲酰胺中的Fe(III)形成络合物
Synthesis of block and graft copolymers of styrene by raft polymerization, using dodecyl-based trithiocarbonates as initiators and chain transfer agents
reversible addition‐fragmentations chain transfer (RAFT) polymerization of styrene. The CTAs were used as initiators for RAFT polymerization, in the absence of the conventional free radical initiator, at higher temperature. Polystyrene (PS) of narrow polydispersity index (PDI) is synthesized. Subsequently, poly(styrene‐b‐benzyl methacrylate) diblock and poly(styrene‐b‐benzyl methacrylate‐b‐2‐vinyl pyridine)
成功地合成了一系列基于十二烷基的单官能三硫代碳酸酯链转移剂(CTA),以实现苯乙烯的可逆加成-断裂链转移(RAFT)聚合。在没有常规自由基引发剂的情况下,在较高的温度下,将CTA用作RAFT聚合的引发剂。合成了具有窄多分散指数(PDI)的聚苯乙烯(PS)。随后,聚(苯乙烯- b -苄基甲基丙烯酸酯)二嵌段和聚(苯乙烯- b -苄基丙烯酸甲酯- b由PS macro-RAFT试剂分别通过分别与第二种和第三种单体加热合成了2-乙烯基吡啶)三嵌段共聚物。这些实验表明,应该有可能通过调节聚合温度来控制由CTA引发的RAFT聚合,以使引发适应于传播(较低温度)而以更快的速率(在较高温度下)进行。 。对于这项工作中研究的特定CTAs,与其他研究的基团相比,在重新引发氰基(CN)取代的基团(R基团)的情况下,苯乙烯的聚合速率很高。结果进一步表明,4-氰基戊酸基团优于用于苯乙烯的RAFT聚合的其他R基团,
MULTILAYER POLYMER FILMS
申请人:Caruso Francesco
公开号:US20090047517A1
公开(公告)日:2009-02-19
The invention relates to a multilayer polymer assembly comprising polymer layers covalently bonded together by crosslinks comprising a cyclic moiety, and to processes for the preparation thereof.
The instant invention discloses a composition, preferably a nanocomposite material, comprising (a) a synthetic polymer, (b) a filler such as for example a natural or synthetic phyllosilicate or a mixture of such phyllosilicates, preferably in nanoparticles, and (c) as dispersing agent a polymer based on a long chain alkyl meth(acryte).
Assembly of Ultrathin Polymer Multilayer Films by Click Chemistry
作者:Georgina K. Such、John F. Quinn、Anthony Quinn、Elvira Tjipto、Frank Caruso
DOI:10.1021/ja063043+
日期:2006.7.1
Layer-by-layer (LbL) assembly is a versatile and robust technique for fabricating tailored thin films of diverse composition. Herein we report a new method of covalent coupling, click chemistry, to facilitate the LbL assembly of thin films. Linear film growth was observed using both UV-vis and FTIR spectroscopy, and film thicknesses were determined by ellipsometry and atomic force microscopy. The assembled films are shown to be stable in a wide pH range. This technique offers the potential to enable the synthesis of new types of stable and responsive LbL films from a variety of polymers.