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NANO-CLAY ENHANCED INJECTION MOLDED PRODUCTS S.Kenig & M.Omer PowerPoint PPT Presentation


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NANO-CLAY ENHANCED INJECTION MOLDED PRODUCTS S.Kenig & M.Omer. The 2 nd Conference on NANOTECHNOLOGY FOR THE PLASTICS & RUBBER INDUSTRIES February 5, 2007. INTRODUCTION. Nano Clays (Montmorillonite) are layered Alumino-Silicates bound together by Na + ions.

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NANO-CLAY ENHANCED INJECTION MOLDED PRODUCTS S.Kenig & M.Omer

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NANO-CLAY ENHANCED INJECTION MOLDED PRODUCTSS.Kenig & M.Omer

The 2ndConference

on

NANOTECHNOLOGY FOR THE

PLASTICS & RUBBER INDUSTRIES

February 5, 2007


INTRODUCTION

  • Nano Clays (Montmorillonite) are layered Alumino-Silicates bound together by Na+ ions.

  • In nature they form a closed structure

  • To be useful the closed structure has to be delaminated (exfoliated).

  • When effectively exfoliated the single layer is 1 nm thick and has a surface area of 1µm x 1µm.

  • The surface area of exfoliated Nano Clays is 700 m2/gr.


INTRODUCTION

  • Commercially available NC are treated with quaternary ammonium ions having an organic tail (organo clays)

  • Homogeneous dispersion of NC is enhanced by optimization of processing conditions


INJECTION MOLDINGFLOW AND THERMAL PROFILES

Spreading radial flow

Fountain flow

Non-isothermal flow


OBJECTIVES

TO STUDY

  • The effect of shear and elongational flows on the orientation of nanoclays

  • The effect of nanoclays on the mechanical properties of injection molded products


INTRODUCTION

  • When exfoliated nanoclays platelets possess high aspect ratio >1:500

    • thickness of: 1 nm

    • lateral dimensions: 500x500 nm

  • The orientation of high aspect ratio particles is affected by the flow field – elongational and/or shear


ELONGATIONAL FLOW

C1~ aspect ratio


SHEAR FLOW


EXPERIMENTAL

directions

Molded sample

Melt front advancement


DESIGN OF EXPERIMENTS


EXPERIMENTAL

  • Materials

    • Nylon 6

    • Nylon 12

  • Nanoclays

    5% Cloisite 30B (hydroxyl terminated)


RESULTS & DISCUSSIONTENSILE FD PA 6

PA 6 neat

Cat 85 15

PA 6/NC


RESULTS & DISCUSSIONTENSILE TD PA 6

PA 6 neat

PA 6/NC


RESULTS & DISCUSSIONFLEXURAL FD PA 6

PA 6 neat

Cat 105 2500

PA 6/NC


RESULTS & DISCUSSIONFLEXURAL TD PA 6

PA 6 neat

PA 6/NC


NYLON 6 / NANOCLAYS


RESULTS &DISCUSSIONTENSILE FD - PA 12

Cat 30 200


RESULTS &DISCUSSIONTENSILE TD – PA 12


RESULTS &DISCUSSIONFLEXURAL FD - PA 6

Cat 25 450


RESULTS &DISCUSSIONFLEXURAL TD – PA12


COMPUTATIONAL SIMULATIONMELT FRONT ADVANCEMENT - PA 6


COMPUTATIONAL SIMULATIONORIENTAION OF NANOCLAYS – PA 6

CORE

SKIN


COMPUTATIONAL SIMULATIONORIENTAION OF NANOCLAYS – PA 6

ANISOTROPY LEVEL

TD

FD


COMPUTATIONAL SIMULATIONMELT FRONT ADVANCEMENT - PA 12


COMPUTATIONAL SIMULATIONORIENTAION OF NANOCLAYS – PA 12

SKIN


COMPUTATIONAL SIMULATIONORIENTAION OF NANOCLAYS – PA 12

ANISOTROPY LEVEL

FD

TD


CONCLUSIONS

  • Large differences in mechanical properties along and across square sample

  • Properties of NC containing polymers are highly dependent on processing conditions due to the high aspect ratio of the NC

  • MD properties are higher compared to TD properties

  • Computational analysis are in good agreement with experimental tensile moduli measurements

  • Anisotropy obtained from computational analysis is similar to the anisotropy obtained from experimental measurements


THANK YOUSEE YOU NEXT YEARFebruary 4, 2008


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