12.07.2015 Views

Contents - Akademi Sains Malaysia

Contents - Akademi Sains Malaysia

Contents - Akademi Sains Malaysia

SHOW MORE
SHOW LESS
  • No tags were found...

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

0 20 40 60 80 100 120 140 160 180 200Temperature (ºC)–20 0 20 40 60 80 100 120 140 160Temperature (ºC)0 20Storage modulus (Pa)1.210 101.010 108.010 96.010 94.010 92.010 9Control20C95RH30C95RH50C95RHTan delta1.00.80.60.40.20.0Control20C95RH30C95RH50C95RHLoss modulus (Pa)1.210 91.010 98.010 96.010 94.010 92.010 9Control20C95RH30C95RH50C95RHControl20C95RH30C95RH50C95RHTan delta1.21.00.80.60.40.20 20 40 60 80 100 120 140 1600.00 20 40 60 80 1000.0120 140 160Temperature (ºC)Temperature (ºC)–20 0 20 40 60 80 100 120 140160180 200–20 0 20 40 60 80 100120 140 160 180200Temperature (ºC)Temperature (ºC)0.0–200 20(a)(b)Control20C95RH30C95RH50C95RH1.21.00.8Control20C95RH30C95RH50C95RHTan delta0.60.40.20.020 40 60 80 100120 140 160 180200Temperature (ºC)–20 0 20 40 60 80 100 120 140 160 180 200Temperature (ºC)(c)Figure 8. Graph of Albipox: (a) Storage modulus versus temperature;(b) Loss modulus versus temperature and (c) Tan d versus temperature for control specimens andspecimens aged at 20°C/95%RH, 30°C/95%RH and 50°C/95%RH for 90 days.for the control specimen. However the graph of E’ curveto higher temperatures with no loss in the peak heights.This means that increase in relative humidity at lower structure of the Albipox although some plasticizationis clearly occurring because the initial storage modulusdecreases.Timberset is unique in the sense that all three thermalparameters are shifted to the right after exposure to highhumidity, Figure 12a, indicating an increase in glasstransition temperature. However, the magnitude of the moisture induces swelling and plasticization of the materialto different extends in different regions which depends onthe microstructure of the adhesives. This has affected theclamping pressure on the specimens in the DMTA.Thermal Properties of Adhesives after Exposure at50ºCFigure 13 shows the results of DMTA analysis on the46

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!