Adhikary 7416

Durability of Wood Flour-Recycled Thermoplastics Composites Under Accelerated Environmental Conditions ,[object Object],Department of Chemical and Process Engineering University of Canterbury Christchurch, New Zealand Ecocity World Summit 2008, San Francisco, USA 22-26 April 2008

[object Object],[object Object],[object Object],[object Object],[object Object],Presentation outline

[object Object],[object Object],[object Object],Background

Background ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Increased use of recycled plastics and wood waste offers the prospect of lessening waste disposals and reducing the product costs

Background ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Development of new value added wood-plastic composite material utilizing recovered plastics and wood waste will have a greater importance from both engineering and economic points of view

What is Wood-Plastic Composite? ,[object Object],[object Object],[object Object],[object Object]

Objectives ,[object Object],[object Object],[object Object]

Experimental: Materials ,[object Object],[object Object],[object Object],Size distribution of radiata pine flour ,[object Object],[object Object],[object Object],[object Object],21 Recycled PP 25 Virgin PP 0.07 Recycled HDPE 0.1 Virgin HDPE Melt flow index, g/10min/(190°C / 2.16 kg) Polymer type

Experimental: Composite preparation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Wood-plastic composite manufacturing process flow Sawdust (wood-flour) Mixing/Compounding Recycled Plastics WPC’s panel (Final product) Hot/Cold pressing of pellets Wood-plastics Pellets

Composite formulations (% by weight)

Accelerated weathering tests ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Testing and analysis ,[object Object],[object Object],[object Object],[object Object],[object Object]

Results 2 h Water Absorption Water absorption by WPCs in Water Submersion 24 h Water Absorption

24 h Thickness Swelling (%) Results Contd…… Thickness Swelling by WPCs in Water Submersion

Flexural MOR of the WPCs Flexural MOE of the WPCs Results Contd…… Flexural properties of WPCs

Results Contd…… Changes in flexural properties of WPCs after 12 FT cycles

Results Contd…… Surface colour measurement ΔE – Discoloration; ΔL*- lightening; Δa*and Δb*-chromaticity coordinates

Discoloration values ( Δ E) for UV-Weathered PP-wood flour Composites Results Contd……

Results (contd.) SEM images of rPP50W50 (a) control and (b) UV-weathered samples Microstructural characterization

Results (contd.) SEM images of rPP45W50CA5 (a) control (b) FT-weathered samples Microstructural characterization

Results contd….. DSC thermograms (2 nd heating) for PP based control and FT weathered composites Thermal properties of WPCs ,[object Object],[object Object],[object Object],[object Object]

Results (contd.) Thermal properties ,[object Object],[object Object],[object Object],[object Object]

Conclusions ,[object Object],[object Object],[object Object]

Property Comparison 0.42-2.5 0.98-4.1 1.06-1.97 14.4-25.5 HDPE based WPC 24 h thickness Swelling (%) 24 h water absorption (%) Flexural MOE (GPa) Flexural MOR (MPa) Property 1.7-3.8 (1h) 2.6 - 0.8-1.5 2-3 (1h) 17.2 <0.01 1.2-3.7 3.0 7.9 1.39 1.7-2.5 40.0 80.0 28.7 17.4-39.6 Regular MDF (3mm) Pine lumber PP lumber PP based WPC

Potential Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Acknowledgements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Additives (Contd…) Modification scheme for esterification reaction between wood particles and maleated polyolefins: (a) monoester and (b) diester formation.

Adhikary 7416

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