CNT in nanocomposites and structural composites


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  • We have to quantify the possible savings
  • The white on the picture is silice. The process enables a more homogeneous vitrification, what brings a better surface structure.
  • CNT in nanocomposites and structural composites

    1. 1. Latest Development of Carbon Nano Tubes in Nanocomposites and Structural Composites Luca MEZZO Senior R&D Manager [email_address]
    2. 2. <ul><li>CNT in Composite Materials </li></ul>STRUCTURAL COMPOSITE: combination of reinforcement material with a matrix (nanocomposite matrix) mixture of two or more polymers (matrix) with one or more fillers (CNT) Nanocomposite Matrix Reinforcement material Fiber
    3. 3. CNT random CNT confined CNT oriented CNT localized Nanocyl Vision from Today Products to Next Generations STARTING POINT FIRST GENERATION SECOND GENERATION THIRD GENERATION A=CNT at the interphase support/matrix B=CNT as central layer in matrix C=CNT at the surface of the matrix A=CNT perpendicular at the interphase support/matrix B=CNT perpendicular to the support and through the tickness of the matrix
    4. 4. From Today to Next Generation, How CNT Properties CNT-Matrix Interactions CNT Dispersion Nanocomposite Processing Final CNT Network Final Targeted Properties
    5. 5. STARTING POINT, CNT Random Main benefits Side benefits
    6. 6. <ul><li>PlastiCyl in Electronics and Automotive </li></ul><ul><li>Higher Cleanliness : less outgassing and low particle count </li></ul><ul><li> decreased risk of contamination </li></ul><ul><li>More homogeneous parts </li></ul><ul><li> elimination of residual voltage </li></ul><ul><li>Better dimensional stability and recyclability </li></ul><ul><li>Meets SAE J1645 standards </li></ul><ul><li>Combination of electrical conductivity/chemical and mechanical resistance </li></ul>
    7. 7. FIRST GENERATION I, CNT Confined
    8. 8. M w 12,400 M w 14,600 M w 15,900 M w 19,300 M w 21,300  Within the M w range of investigated, we observed a Lilly-like effect that was characterised by unique exfoliation pattern. Lilly  The Lilly’s pattern conforms to a trend with respect to M w (see schema). Schema  Lower M w = loosely spread Lilly Higher M w = densely populated Lilly PlastiCyl: Influence of Polymer and Processing
    9. 9. <ul><li>PLASTICYL: MOLECULAR WEIGHT VS. CONDUCTIVITY </li></ul><ul><li>Surface resistivity decreases with decreasing M w . </li></ul><ul><li>Volume resistivity decreases with increasing M w . </li></ul><ul><li>Volume and surface resistivity goes in opposite </li></ul><ul><li>trend with M w . </li></ul><ul><li>A cross-over point exist where volume resistivity </li></ul><ul><li>coincide with surface resistivity. </li></ul>cross-over point Loosely spread Lilly = good surface conductivity Densely populated Lilly = good volume conductivity POSSIBLE CORRELATION
    10. 10. FIRST GENERATION II, CNT Confined Main benefits Side benefits
    11. 11. BioCyl, Morphology <ul><li>CNTs have big effect on the matrix ; modification of the polymeric structure resulting in a very peculiar surface structure </li></ul>AFM images indicate an important surface modification: reduction of submicronic roughness Patented Technology
    12. 12. Observation: BioCyl passes the fouling test easily at considerably lower settlement levels than the commercial anti-fouling paint. BioCyl: Settlement of Barnacles After 24 Hours Patented Technology BioCyl 0 20 40 60 80 100 120 140 glass silicone resin without CNT mean percentage settlement compared to the glass standard (%) 160 Commercial anti-fouling paint Pass line: paints with lower values pass the fouling test
    13. 13. FIRST GENERATION III, CNT Confined Patented Technology Main benefits Side benefits
    14. 14. Viscosity evolution of CNTs-filled PDMS (part A) with shear rate - Huge increase of the viscosity at lower shear rate - Rheothinning effect !! ThermoCyl: Interaction CNT - PDMS Patented Technology
    15. 15. ThermoCyl: Affinity CNT-PDMS CNTs-PDMS AFFINITY via CH-  interactions Adsorption energy per repeat unit ~ 2.6±0.1 kcal/mol Patented Technology
    16. 16. ThermoCyl: Industrial Applications, Cables No burning droplets, low smoke densities . Even after prolonged periods of exposure, the combustions stops after a few seconds. <ul><li>The cable passes most W&C flame test (UL94, Cable Flame Test, IEC-332-3...). </li></ul><ul><li>higher FR performance </li></ul><ul><li>allow new cable design </li></ul><ul><li>removal of Mica sheet results in higher throughputs </li></ul><ul><li>cost and material reduction </li></ul>Patented Technology
    17. 17. ThermoCyl: Industrial Applications, Aircraft Fuel Tanks Thermal barrier coating ThermoCyl  ISO 2685/ 1100°C / 116 ±10 kW/m 2 Actual solution : - thickness 4-8 mm - 42 % fillers loading ALUMINIUM Patented Technology
    18. 18. <ul><li>HaiyunMa1, Lifang Tong, Zhongbin Xu1 and Zhengping Fang / nanotechnology 18 (2007) 375602 (8pp) </li></ul>PlastiCyl: FR Achievements in ABS
    19. 19. PlastiCyl: Effect of CNT Dispersion <ul><li>Takashi Kashiwagia, Fangming Dub, Karen I. Wineyc, Katrina M. Grotha, John R. Shieldsa, Severine P. Bellayera, Hansoo Kimc, Jack F. Douglas / Polymer 46 (2005) 471–481 </li></ul>
    20. 20. FIRST GENERATION IV, CNT Confined Main benefits Side benefits
    21. 21. <ul><li>EpoCyl, CNT Morphology in the Final Composite </li></ul>
    22. 22. EpoCyl: Dispersion Rate to Achieve the Right Dispersion = Right Morphology Nanofibers CNT Competitor Hand Mixing Standard mixing High Shear, short time mixing High Shear, long time mixing Neat Epoxy Resin (DGEBA) Nanocomposite NC7xxx Unmodified Resin NC7000 Good Dispersion NC7XXX, average dispersion Structural Composite (Epoxy+carbon fiber 60% fv)
    23. 23. Focus on a replaceable material: Copper mesh The function of this material is to drive the current resulting from a lightning strike on preferential route. It is generally embedded under one ply of composite material. Level of conductivity reached by embedded CNTs can help dissipate the strike with less metallic mesh Lighter structures with higher fuel efficiency EpoCyl, Lower Lightning Strike Damage
    24. 24. Patented Technology Nanocomposite Matrix Reinforcement material Fiber Sizing
    25. 25. Patented Technology SiziCyl: Interface Properties Single fiber push-out tests sample Avg value of interfacial strength (Mpa) Virgin glass fibers/epoxy 177 Sized glass fibers/Epoxy 328
    26. 26. CONCLUSIONS <ul><li>Homogeneous and so called ‘good dispersion’ of the CNT does not necessary lead to the best final properties </li></ul><ul><li>The challenge is to identify the correlation between CNT morphology/CNT-Polymer affinity/Processing conditions to achieve the right CNT dispersion and organization which allows to achieve the final targeted properties </li></ul><ul><li>The today achievements in final properties with the ‘first’ and ‘second’ generation of composites are still far away to be best possible, so long way of development is still necessary </li></ul><ul><li>The highest challenge, from an industrial point of view, it is NOT only to achieve the desired dispersion level and CNT orientation but to do it COST EFFECTIVE </li></ul><ul><li>CNT industries will need to supply the market with raw materials and semi finished products, togeather with further processing indications on how to achieve the final desired dispersion level </li></ul>
    27. 27. Luca MEZZO [email_address] + 32/ 71.750.685 Thank You for Your Attention