研究目的
To prepare new oxygen and pressure sensitive paints (PSPs) with multi-arm polymeric structures using atom transfer radical polymerization (ATRP) and investigate their sensing performance, including sensitivity and response time to oxygen and pressure, as well as the effects of electrospinning on enhancing sensitivity.
研究成果
Multi-arm polymers synthesized via ATRP with optimized compositions (e.g., P3) exhibit high sensitivity to oxygen and pressure, with faster response times due to fluorine content. Electrospinning enhances sensitivity by creating microstructures with larger surface areas. This approach broadens the design of pressure-sensitive paints and offers potential for improved aerodynamic measurements.
研究不足
The use of DMF as a solvent in ATRP led to low monomer conversions and high polydispersities, which could affect polymer quality and sensing performance. The study is limited to laboratory-scale synthesis and testing; scalability and real-world application in wind tunnels or other environments were not addressed. The response times, while improved, may still be insufficient for very high-speed applications.
1：Experimental Design and Method Selection:
The study used ATRP for synthesizing multi-arm copolymers with varying ratios of poly(isobutyl methacrylate) (PolyIBMA) and poly(trifluoroethyl methacrylate) (PolyTFEM), incorporating a platinum porphyrin-based probe. Electrospinning was employed to create films with microstructures to increase surface area and improve sensing performance.
2：Sample Selection and Data Sources:
Five copolymers (P1-P5) were synthesized with different monomer ratios. Samples were prepared on TLC plates for sensing tests.
3：List of Experimental Equipment and Materials:
Instruments included UV-vis spectrophotometer (PerkinElmer Lambda 650), spectrofluorophotometer (Horiba FluoroMax-4), NMR spectrometer (Brucker Avance III 400 MHz), GPC system (Waters 1515), electrospinning device (TL-Pro-BM), SEM (Tescan Mira3), and a self-assembled pressure analysis system. Chemicals included monomers (IBMA, TFEM), catalyst (Cu(I)Br), ligand (HMTETA), initiator (pentaerythritol tetrakis(2-bromoisobutyrate)), and solvents.
4：Experimental Procedures and Operational Workflow:
Polymers were synthesized via ATRP in Schlenk tubes at 75°C, characterized by NMR and GPC. Sensing films were prepared by spraying polymer solutions on TLC plates or electrospinning. Oxygen and pressure sensing tests were conducted using gas mixtures and a vacuum chamber, with phosphorescence intensity measured.
5：Data Analysis Methods:
Data were analyzed using Stern-Volmer equations for oxygen and pressure sensitivity, and response times were measured. SEM was used for morphological analysis.
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UV-vis spectrophotometer
Lambda 650
PerkinElmer
Recording UV-vis absorption spectra
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NMR spectrometer
Avance III 400 MHz
Brucker
Recording 1H-NMR and 19F-NMR spectra
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Spectrofluorophotometer
FluoroMax-4
Horiba
Measuring phosphorescence spectra
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GPC system
1515
Waters
Analyzing molecular weights of polymers
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Electrospinning device
TL-Pro-BM
Shenzhen
Preparing electrospun films
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SEM
Mira3
Tescan
Observing morphologies of films
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LED light
405 nm LED
Photo-luminance excitation
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CCD camera
Taking images for pressure sensing
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Pressure gage
Monitoring pressure changes
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Vacuum pump
Adjusting pressures in the system
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Gas manipulators
Alicat
Adjusting gas mixtures for oxygen sensing
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