کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5183435 | 1381018 | 2012 | 9 صفحه PDF | دانلود رایگان |
Nanocomposites of chitosan are produced using graphene sulphonic acid (SG) at five different compositions and are designated as SG0.5, SG0.75, SG1, SG3 and SG5; the numbers indicate weight percent of SG. The TEM & AFM micrographs indicate that the SG sheets are in exfoliated state. The thermal stability and the storage modulus of the composites increase with increasing SG concentration showing a maximum increase (202%) for SG5 sample. The stresses at break and Young's modulus have increased with increasing SG content. SG5 shows the highest increase of both tensile strength and Young's modulus of 290 ± 7% and 200 ± 7%, respectively. Analysis of the Young's modulus data suggests that SG sheets are randomly distributed and at â¥1 wt% concentration they are unidirectionally oriented parallel to the film. The system exhibits percolation threshold of 0.49 wt% SG and it attains maximum conductivity of 0.13 S mâ1 at 1.6 wt% SG.
Journal: Polymer - Volume 53, Issue 11, 9 May 2012, Pages 2265-2273