共查询到19条相似文献,搜索用时 156 毫秒
1.
无机物表面引发聚合反应制备端接枝聚合物膜* 总被引:1,自引:0,他引:1
无机物表面引发聚合反应是聚合物合成化学的又一新领域。分子自组装技术的发展使得各种类型的聚合反应都有转移到固体表面进行的可能。本文综述了无机物表面引发聚合反应用于制备高键合密度端接枝聚合物膜的研究进展,并对其今后的发展提出了见解。 相似文献
2.
3.
利用粗粒化分子动力学方法提出了一个包含活化/去活化可逆过程的表面引发聚合反应模型,用以研究高引发密度表面引发聚合反应过程中不同聚合速率和不同转化几率(活化/去活化)对产物聚合物刷性质的影响.可通过调节聚合反应几率和活化/去活化过程发生的比率,在相对短的时间内制备高引发密度下低分散性的聚合物刷. 相似文献
4.
5.
氟碳端基聚合物合成及其表面吸附性能 总被引:5,自引:0,他引:5
综述了近十年来氟端基聚合物的合成,表征及其在表面吸附行为的研究成果。通过含有氟烷基的引发剂或终止剂在活性阴离子聚合反应或自由基聚合反应中使聚合物接上氟端基。已经成功地利用活性阴离子聚合反应合成了氟端基聚苯乙烯,通过含氟自由基引发烯类单体(如丙烯酸,乙烯硅等)可在相应聚合物链上引入氟端基,另外,聚合物的化学改性方法也可将氟基团接在聚合物链端(如氟基聚氧乙烯,氟端基聚合物具有的表面活性,当水溶液中或聚 相似文献
6.
采用表面引发室温原子转移自由基聚合(ATRP)方法在金基底上原位制备了接枝聚合物刷,其制备过程用厚度测量,ATR-FTIR,XPS等进行了表征,初始时聚合物刷的厚度随着聚合时间的增加线性增加,表现为活性聚合的特征.XPS表征证明表面引发聚合后聚合物刷末端仍然存在ATRP反应的引发剂.紫外光刻图案化的聚合物刷作为电沉积的模板,经电沉积、后紫外处理、湿化学刻蚀步骤后得到了分离的导电聚合物微阵列结构,通过浇注/粘附处理将导电聚合物微阵列转移至硅油弹性体片,由于导电聚合物在湿化学刻蚀中对基底金具有良好的保护作用,因此在导电聚合物阵列被转移后,基底表面得到金微阵列。 相似文献
7.
聚合物Langmuir—Blodgett膜研究进展 总被引:1,自引:1,他引:1
聚合物LB膜可用两种方法制备,一种是两亲单体成膜再进行聚合反应,另一种为直接从两亲聚合物在亚相表面铺展成膜并转移。本文综合聚合物LB膜的研究状况,包括两亲聚合物和非两亲聚合物,对聚合物LB膜的成膜特点,结构和性能作了描述,并简要介绍了聚合物LB膜的应用前景。 相似文献
8.
9.
从二甲苯出发,经过溴甲基化反应、氧化反应、酯化反应和溴代反应,合成了一种四官能团的引发剂,4,6-二(溴甲基)-1,3-苯二甲酸二甲酯.用该引发剂引发苯乙烯进行原子转移自由基聚合,实验结果表明聚合反应具有活性自由基聚合的特征.通过苯乙烯的本体聚合反应获得了分子量可控、双酯基位于聚合物链中间的聚苯乙烯.经过水解反应,使聚合物中的双酯基被水解成双羧基,从而得到了结构对称的两亲性聚合物,双羧基聚苯乙烯.利用该聚合物具有分子识别的特性,与十二烷胺形成了离子键超分子化合物.此工作为超分子星形聚合物的设计合成提供了简便快捷的方法. 相似文献
10.
11.
Bio‐Inspired Renewable Surface‐Initiated Polymerization from Permanently Embedded Initiators 下载免费PDF全文
Tao Du Dr. Bin Li Prof. Xiaolong Wang Dr. Bo Yu Prof. Xiaowei Pei Prof. Wilhelm T. S. Huck Prof. Feng Zhou 《Angewandte Chemie (International ed. in English)》2016,55(13):4260-4264
Herein, we describe a simple and robust approach to repeatedly modify surfaces with polymer brushes through surface‐initiated atomic transfer radical polymerization (SI‐ATRP), based on an initiator‐embedded polystyrene sheet that does not rely on specific surface chemistries for initiator immobilization. The surface‐grafted polymer brushes can be wiped away to expose fresh underlying initiator that re‐initiates polymerization. This strategy provides a facile route for modification of molded or embossed surfaces, with possible applications in the preparation of fluidic devices and polymer‐embedded circuits. 相似文献
12.
13.
Qualitative degradation of the pesticide coumaphos in solution,controlled aerosol,and solid phases on quaternary ammonium fluoride polymer brushes 下载免费PDF全文
With the growing demand for measurements of organophosphate (OP) pesticide use in agriculture along with the potential threat of OP‐based chemical warfare agents, there is a need for new devices or surfaces that can quickly degrade OPs into less toxic substances in a variety of environments. Using surface‐initiated atom transfer radical polymerization and post‐polymerization synthesis, we prepared a series of quaternary ammonium fluoride‐based polymer brushes designed to absorb and degrade OPs. Specifically, a polymer brush was formed using 2‐dimethylamino‐ethyl methacrylate (DMAEMA) as monomer, which, following post‐polymerization quaternization of the tertiary amine with alkylating agents and fluoride ion exchange, afforded the OP‐reactive polymer surfaces. Poly(DMAEMA) brushes were grown to thicknesses of ~100 nm on silicon wafers and glass slides and characterized by ellipsometry, atomic force microscopy, and Raman spectroscopy. Quaternization and subsequent ion exchange of the brushes were characterized by Raman spectroscopy and X‐ray photoelectron spectroscopy, respectively. The interaction of the brushes with OPs was evaluated using the OP‐based pesticide coumaphos, through the presence of the highly fluorescent degradation product chlorferon; analyzed qualitatively via fluorescence microscopy; and confirmed via nuclear magnetic resonance and mass spectrometry. We found that the fluoride form of the brush reliably degraded coumaphos deposited via controlled solution‐based applications and aerosol applications (electrohydrodynamic jetting) and from microcontact printing of the dried solid directly onto the brush. No degradation was seen for coumaphos deposited on poly(DMAEMA) or the iodide form of the quaternized brush. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
14.
Udo Wagenknecht Uwe Gohs Andreas Leuteritz Sebastian Volke Sven Wiessner Gert Heinrich 《Macromolecular Symposia》2011,301(1):146-150
Summary: Polymer modification with high energy electrons is well-established in polymer industry and used for degradation, cross-linking, grafting, curing, and polymerization. These applications use local and temporal precise input of energy in order to generate excited atoms or molecules and ions for subsequent molecule changes via radical induced chemical reactions. In the present study, high energy electrons have been used to modify polyolefine (polyethylene and polypropylene) systems in presence of a grafting agent under stationary and in-stationary conditions. Polymer modification with high energy electrons under stationary conditions characterizes a process where required absorbed dose is applied to polymers in solid state and at room temperature. Polymer modification with high energy electrons under in-stationary conditions is a novel process where required absorbed dose is applied in molten state during melt mixing process. In this novel process, the penetration depth of electrons is limited to a part of mixing volume. The total mixing volume is modified due to the change of polymer mass within the penetration depth of electrons during mixing process. A 1.5 MeV electron accelerator has been directly coupled to a banbury mixing chamber in order to study this novel process. In comparison to the stationary process, the main differences are working at higher temperature, absence of any crystallinity, intensive macromolecular mobility as well as intensive mixing during dose application. The influence of both processes on mechanical properties and flame resistance of polymer composites is discussed. 相似文献
15.
Synthesis,Solid‐State NMR Characterization,and Application for Hydrogenation Reactions of a Novel Wilkinson’s‐Type Immobilized Catalyst 下载免费PDF全文
Safaa Abdulhussain Dr. Hergen Breitzke Dr. Tomasz Ratajczyk Dr. Anna Grünberg Mohamad Srour Danjela Arnaut Heiko Weidler Ulrike Kunz Prof. Dr. Hans Joachim Kleebe Dr. Ute Bommerich Prof. Dr. Johannes Bernarding Dr. Torsten Gutmann Prof. Dr. Gerd Buntkowsky 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(4):1159-1166
Silica nanoparticles (SiNPs) were chosen as a solid support material for the immobilization of a new Wilkinson’s‐type catalyst. In a first step, polymer molecules (poly(triphenylphosphine)ethylene (PTPPE); 4‐diphenylphosphine styrene as monomer) were grafted onto the silica nanoparticles by surface‐initiated photoinferter‐mediated polymerization (SI‐PIMP). The catalyst was then created by binding rhodium (Rh) to the polymer side chains, with RhCl3 ? x H2O as a precursor. The triphenylphosphine units and rhodium as RhI provide an environment to form Wilkinson’s catalyst‐like structures. Employing multinuclear (31P, 29Si, and 13C) solid‐state NMR spectroscopy (SSNMR), the structure of the catalyst bound to the polymer and the intermediates of the grafting reaction have been characterized. Finally, first applications of this catalyst in hydrogenation reactions employing para‐enriched hydrogen gas (PHIP experiments) and an assessment of its leaching properties are presented. 相似文献
16.
17.
多力响应基团聚合物(MMPs)的设计与合成为高灵敏地观察和定量力化学转变及高效利用机械能提供了新机遇, 推动了聚合物力化学的发展. 本文主要介绍了后聚合改性、 逐步聚合、 开环易位聚合和活性/可控自由基聚合等4种MMPs的合成方法, 分别对这些方法的特点、 优势和适用体系进行了论述, 期望为新型机械力响应性聚合物的制备和应用提供新思路. 相似文献
18.