Cho, Hyunjung Jin, Kyeong Sik Lee, Jaegeun Lee, Kun-Hong 2024-01-19T22:30:37Z 2024-01-19T22:30:37Z 2022-01-25 2018-07 0957-4484 https://pubs.kist.re.kr/handle/201004/121173 Small angle x-ray scattering (SAXS) was used to estimate the degree of polymerization of polymer-grafted carbon nanotubes (CNTs) synthesized using a 'grafting from' method. This analysis characterizes the grafted polymer chains without cleaving them from CNTs, and provides reliable data that can complement conventional methods such as thermogravimetric analysis or transmittance electron microscopy. Acrylonitrile was polymerized from the surface of the CNTs by using redox initiation to produce poly-acrylonitrile-grafted CNTs (PAN-CNTs). Polymerization time and the initiation rate were varied to control the degree of polymerization. Radius of gyration (R-g) of PAN-CNTs was determined using the Guinier plot obtained from SAXS solution analysis. The results showed consistent values according to the polymerization condition, up to a maximum R-g = 125.70 A whereas that of pristine CNTs was 99.23 A. The dispersibility of PAN-CNTs in N,N-dimethylformamide was tested using ultraviolet-visible-near infrared spectroscopy and was confirmed to increase as the degree of polymerization increased. This analysis will be helpful to estimate the degree of polymerization of any polymer-grafted CNTs synthesized using the 'grafting from' method and to fabricate polymer/CNT composite materials. English IOP PUBLISHING LTD Estimation of degree of polymerization of poly-acrylonitrile-grafted carbon nanotubes using Guinier plot of small angle x-ray scattering Article 10.1088/1361-6528/aabe5b 1 NANOTECHNOLOGY, v.29, no.27 NANOTECHNOLOGY 29 27 N scie scopus 000431778200004 2-s2.0-85048233612 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article TRANSFER RADICAL POLYMERIZATION MECHANICAL-PROPERTIES FUNCTIONALIZATION COMPOSITES SURFACE FILMS NANOCOMPOSITES POLYSTYRENE MORPHOLOGY FABRICATION grafting from radius of gyration dispersibility