研究目的
The purpose of this study was to obtain MWCNT/PMMA composites with various types of nanotube agglomerate distribution in the polymer matrix (with a concentration of nanotubes close to the percolation threshold). To obtain composites using the co-coagulation method, we varied the ultrasonic treatment time during the preparation of nanotube powder suspensions and PMMA to affect the size of the nanotube agglomerates. SEM and optical microscopy were used to characterize the distribution of nanotubes in the PMMA matrix, and the CVC for characterizing the resistivity of the composites.
研究成果
The study demonstrated that ultrasonic treatment time significantly affects the distribution of MWCNTs in PMMA composites and their electrical properties. A method for evaluating the uniformity of nanotube distribution based on sequential CVC measurements was suggested. The findings have implications for the development of functional materials with tailored electrical properties.
研究不足
The study is limited by the specific conditions of ultrasonic treatment and the range of MWCNT concentrations and sonication times tested. The findings may not be generalizable to all types of polymer matrices or CNT composites. Additionally, the mechanisms of contact formation and resistivity changes are complex and may require further investigation to fully understand.
1：Experimental Design and Method Selection:
The study involved the synthesis of MWCNT/PMMA composites by coagulation technique, varying the ultrasonic treatment time to affect the size of nanotube agglomerates. SEM and optical microscopy were used for characterization, and current-voltage characteristics (CVC) were measured for resistivity analysis.
2：Sample Selection and Data Sources:
MWCNTs with a mean diameter of 9.8 nm were produced using the CVD method. MWCNT/PMMA composites were prepared with varying MWCNT content and sonication times.
3：8 nm were produced using the CVD method. MWCNT/PMMA composites were prepared with varying MWCNT content and sonication times.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included an ultrasonic processor (USPA-0.4/22-OM, U-sonic, Russia), SEM (JSM6460LV Jeol, Japan), optical microscope (BioMed 5, Russia), and picoamperemeter/voltage source (Keithley 6487, U.S.A.) with resistivity test fixture (Keithley 8009, U.S.A.). Materials included MWCNTs, PMMA, N,N-dimethylformamide, and Triton X-
4：4/22-OM, U-sonic, Russia), SEM (JSM6460LV Jeol, Japan), optical microscope (BioMed 5, Russia), and picoamperemeter/voltage source (Keithley 6487, U.S.A.) with resistivity test fixture (Keithley 8009, U.S.A.). Materials included MWCNTs, PMMA, N,N-dimethylformamide, and Triton X-Experimental Procedures and Operational Workflow:
100.
4. Experimental Procedures and Operational Workflow: The procedure involved ultrasonic treatment of MWCNT suspensions, preparation of composites by coagulation technique, hot pressing to form films, and measurement of resistivity and current-voltage characteristics under varying conditions.
5：Data Analysis Methods:
Data analysis included SEM and optical microscopy for structural characterization, and analysis of current-voltage characteristics to evaluate resistivity changes and contact types between nanotubes.
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