Self-floating ability and initiating gradient photopolymerization of acrylamide aqueous solution of a water-soluble polysiloxane benzophenone photoinitiator
Literature Information
Jiansheng Wang, Jiye Cheng, Jiancheng Liu, Yanjing Gao
Three water-soluble polysiloxane benzophenone photoinitiators (W-Si-HBP2-A/B/C) with various silicon content used for preparing a gradient polymer were synthesized based on the traditional photoinitiator 4-hydroxybenzophenone (HBP) and aminopolysiloxane. The structures were confirmed by proton nuclear magnetic resonance (1H NMR), and gel permeation chromatography (GPC). The water solubility of the photoinitiators, the effect of the silicon content on their triplet state lifetimes and photopolymerization property and the self-floating ability in the water system, and the internal connection between the surface morphology and property of the gradient polymer and film initiated by the photoinitiators were investigated. All three photoinitiators showed relatively good solubility in water, and longer triplet lifetimes and a smaller rate constant than HBP. It is found that the photoinitiator with the highest silicon content had the best floating capability due to lower surface tension and energy of polysiloxane. By using this photoinitiator, the gradient polymer with a significant molecular weight gradient was obtained. In addition, the polysiloxane-based photoinitiators can decrease the dispersion surface energy of the gradient polymer, and the increase of photoinitiator content can change the microstructure of the gradient polymer film. The new green method for preparing gradient polymeric material by using the polymerization technology and the water-soluble polysiloxane-based photoinitiators may have potential applications in the green chemical industry.
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Green Chemistry provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on, but not limited to, the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998). Green chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry is at the frontiers of this continuously-evolving interdisciplinary science and publishes research that attempts to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. Submissions on all aspects of research relating to the endeavour are welcome. The journal publishes original and significant cutting-edge research that is likely to be of wide general appeal. To be published, work must present a significant advance in green chemistry. Papers must contain a comparison with existing methods and demonstrate advantages over those methods before publication can be considered. For more information please see this Editorial. Coverage includes the following, but is not limited to: Design (e.g. biomimicry, design for degradation/recycling/reduced toxicity…) Reagents & Feedstocks (e.g. renewables, CO2, solvents, auxiliary agents, waste utilization…) Synthesis (e.g. organic, inorganic, synthetic biology…) Catalysis (e.g. homogeneous, heterogeneous, enzyme, whole cell…) Process (e.g. process design, intensification, separations, recycling, efficiency…) Energy (e.g. renewable energy, fuels, photovoltaics, fuel cells, energy storage, energy carriers…) Applications (e.g. electronics, dyes, consumer products, coatings, pharmaceuticals, preservatives, building materials, chemicals for industry/agriculture/mining…) Impact (e.g. safety, metrics, LCA, sustainability, (eco)toxicology…) Green chemistry is, by definition, a continuously-evolving frontier. Therefore, the inclusion of a particular material or technology does not, of itself, guarantee that a paper is suitable for the journal. To be suitable, the novel advance should have the potential for reduced environmental impact relative to the state of the art. Green Chemistry does not normally deal with research associated with 'end-of-pipe' or remediation issues.










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