tailieunhanh - Carbon nanotubes as nanofillers

Properties of CNT: • Electrical : – High electric conductivity (higher than copper) – Easy process for Conductive Semi-conductive • Thermal : – High thermal conductivity (higher than silicon) – Stable at high temperature • Physical : – 100 times stronger than steel but very light – Elastic behavior (Pressing CNT tip bend and recover to its original state) • Chemical : – Rarely react with other compounds – Chemically stable | Outline I. Polymer microcomposites filled with microparticles . Mechanical melt blends . Importance of « polymer/filler » interface (tension and adhesion) . "Polymerization-filled composites" PFCs II. Polymer nanocomposites filled with nanoparticles . Layered silicate as nanofillers - Polymer-clay nanocomposites : melt blending vs. in situ polymerization - Polyolefinic matrices : role of matrices and compatibility - Polyester matrices : role of clays and organo-modification . Carbon nanotubes as nanofillers - Polymer-CNTs composites : production and properties - « Melt blending » technique, ., in elastomeric matrices - in situ polymerization, ., in thermoplastic matrices III. General conclusions et outlook Chapter 3 : Polymer nanocomposites filled with nanoparticles Part II. Carbon nanotubes as nanofillers Allotropic forms of Carbon Curl, Kroto, Smalley 1985 Iijima 1991 graphene (From R. Smalley´s web image gallery) - Single-wall nanotubes (SWNTs) - Multi-wall nanotubes (MWNTs) Carbon Nanotubes ~ 1-2 nm Few microns TEM images of various MWNTs ~ 2 - 50 nm Properties of CNT Electrical : High electric conductivity (higher than copper) Easy process for Conductive Semi-conductive Thermal : High thermal conductivity (higher than silicon) Stable at high temperature Physical : 100 times stronger than steel but very light Elastic behavior (Pressing CNT tip bend and recover to its original state) Chemical : Rarely react with other compounds Chemically stable Conductive Semiconductive Diode ‘Kink CNT’: divide conductive and semi-conductive Synthesis methods of CNT Arc discharge First CNT synthesis method used by Arc is formed in the gap between two graphite electrodes Grow SWNT with catalyst (Co, Ni, Fe, Y, etc.), while MWNT without catalyst metal Usual conditions : 400~700 torr (use He gas) 20~30 V between electrodes 1mm distance between electrodes 50~100 A For higher purity: Rotate cathode to uniform the arc High the temperature Use . | Outline I. Polymer microcomposites filled with microparticles . Mechanical melt blends . Importance of « polymer/filler » interface (tension and adhesion) . "Polymerization-filled composites" PFCs II. Polymer nanocomposites filled with nanoparticles . Layered silicate as nanofillers - Polymer-clay nanocomposites : melt blending vs. in situ polymerization - Polyolefinic matrices : role of matrices and compatibility - Polyester matrices : role of clays and organo-modification . Carbon nanotubes as nanofillers - Polymer-CNTs composites : production and properties - « Melt blending » technique, ., in elastomeric matrices - in situ polymerization, ., in thermoplastic matrices III. General conclusions et outlook Chapter 3 : Polymer nanocomposites filled with nanoparticles Part II. Carbon nanotubes as nanofillers Allotropic forms of Carbon Curl, Kroto, Smalley 1985 Iijima 1991 graphene (From R. Smalley´s web image gallery) - Single-wall nanotubes (SWNTs) - .