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제안 방법
- In this article, we report the effect of CNT pre-treatment on dispersion and electrical properties in MWNTs/polymer composites, which were prepared by melt mixing using twin screw extruder. Two different approaches for the pre-treat ment of MWNT, 13 concentrated acid treatment and thermal treatment were employed.
이론/모형
- 5 mm thickness prepared by hot pressing of extruded strand at 240 ℃. Electrical conductivity measure ment was performed using the four-probe method to elimi nate the effect of contact resistance. A Keithley 6512 digital multimeter equipped with a YEW 2553 DC voltage current standard (YEW Electronics, Japan) was 니sed to measure the I-V characteristics of the samples at room temperature.
- As a matrix, poly(methyl methacrylate) (PMMA, Sigma Aldrich) with molecular weight of 350, 000 in the form of spherical particles of 100~200 //m diameter was used. The MWNTs (obtained from Iljin Nanotech)grown by CVD method were used as a nanofiller. As- received MWNTs show severe agglomeration of interwind ing entanglements of each CNT on SEM examination.
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