Facile synthesis of cauliflower-like hydrophobically modified polyacrylamide nanospheres by aerosol-photopolymerization
Facile synthesis of cauliflower-like hydrophobically modified polyacrylamide nanospheres by aerosol-photopolymerization
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DOI：
10.1016/j.eurpolymj.2016.08.022
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发表时间：
2016-10
影响因子：
6
通讯作者：
M. Shaban;M. M. Ahadian-M.;Y. Tamsilian;A. Weber
中科院分区：
文献类型：
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作者：
M. Shaban;M. M. Ahadian-M.;Y. Tamsilian;A. Weber
由亲水和疏水单体单元组成的两亲性共聚物由于其独特的性质和在水溶液中稳定各种界面的能力而引起了人们的广泛关注。本文首次采用连续气溶胶光聚合法制备了球形聚丙烯酰胺、聚苯乙烯和疏水改性聚丙烯酰胺（HM-PAM）。为此，通过雾化器产生单体液滴，然后通过在光反应器中30 s的平均气溶胶停留时间内对含有光引发剂的气溶胶单体液滴进行紫外（UV）照射来“在飞行中”引发光聚合。为了控制所得到的HM-PAM共聚物的水溶性、尺寸和形态，向系统中引入不同的苯乙烯/丙烯酰胺单体浓度。利用TEM、SEM和N2吸附-脱附等温线对材料的织构进行了表征。结果表明，共聚物和聚丙烯酰胺具有菜花状形态，而聚苯乙烯具有近光滑的形态。通过1H NMR、FT-IR、TGA和元素分析等表征手段对所得材料的化学组成进行了研究，1H NMR和元素分析结果表明，苯乙烯成功地引入到共聚物中，与初始比例相比具有良好的一致性。利用气溶胶光聚合法制备丙烯酰胺和苯乙烯的两亲性共聚物，为制备各种亲水性和疏水性单体的两亲性共聚物开辟了新的途径。
Amphiphilic copolymers consist of hydrophilic and hydrophobic monomer units have attracted great technological attention recently, owing to their unique properties and their ability to stabilize various interfaces in aqueous systems. This paper presents a novel and facile approach to produce spherical polyacrylamide, polystyrene and hydrophobically modified polyacrylamide (HM-PAM), as one of the most important type of amphiphilic copolymers, using a continuous aerosol-photopolymerization for the first time. To this end, the monomer droplets were generated by an atomizer, then photopolymerization was initiated ‘‘in flight’’ by ultraviolet (UV) irradiation of the aerosol monomer droplets containing photoinitiator within the average aerosol residence time of 30 s in the photoreactor. To control the aqueous solubility, size and morphology of the resulting HM-PAM copolymers, different styrene/acrylamide monomer concentrations were introduced to the system. The textural properties of the obtained materials were characterized by TEM, SEM and N2adsorption-desorption isotherms. The results revealed that the copolymers and polyacrylamide have cauliflower-like morphologies, while polystyrene has a nearly smooth morphology. Moreover, chemical compositions of the obtained materials were investigated by several characterization techniques such as1H NMR, FT-IR, TGA and elemental analysis.1H NMR and elemental analysis of resulting copolymers microstructures displayed successful incorporation of styrene in copolymer with a good agreement compared to initial ratios. The production of amphiphilic copolymer of acrylamide and styrene using the facile aerosol-photopolymerization method might open new avenues to produce various amphiphilic copolymers with a variety of hydrophobic and hydrophilic monomers with desirable properties.