Jang, Pill Gyu Suh, Kwang S. Park, Min Kim, Jun Kyung Kim, Woo Nyon Yoon, Ho Gyu 2024-01-21T00:30:48Z 2024-01-21T00:30:48Z 2021-08-31 2007-10-05 0021-8995 https://pubs.kist.re.kr/handle/201004/134047 We have studied the electrical conductivity and percolation threshold of polyurethane (PU) composites filled with multiwalled carbon nanotubes (MWCNT) purified by increasing immersion time in aqueous solutions of either nitric acid or a mixture of nitric and sulfuric acids at 80 degrees C. The MWCNT crystallinity peaks after 2 h of treatment, which enables the PU composites to enhance the percolation threshold and electrical conductivity in the conductive network formation region. MWCNT treated under either a milder or severer acidic condition deteriorate the electrical behavior of the composites, since MWCNT are poorly dispersed in the PU matrix in the former condition, but lost their intrinsic electrical conductivity due to the partial destruction of their crystalline structure in the latter. Therefore, the acid treatment needs to be carefully controlled to effectively purify the MWCNT, maintain the crystalline structure without further damage, and thereby improve the electrical behavior of PU/MWCNT composites. (c) 2007 Wiley Periodicals, Inc. English JOHN WILEY & SONS INC FUNCTIONALIZATION Electrical Behavior of polyurethane composites with acid treatment-induced damage to multiwalled carbon nanotubes Article 10.1002/app.26564 1 JOURNAL OF APPLIED POLYMER SCIENCE, v.106, no.1, pp.110 - 116 JOURNAL OF APPLIED POLYMER SCIENCE 106 1 110 116 scie scopus 000248609900015 2-s2.0-34548477923 Polymer Science Polymer Science Article FUNCTIONALIZATION polyurethane/MWCNT composites acid treatment-induced damage electrical conductivity percolation