Contents - Akademi Sains Malaysia

Z. Ahmad et alStorage modulus (Pa)1.210 101.010 108.010 96.010 94.010 92.010 9Control20C95RH30C95RH50C95RHLoss modulus (Pa)1.210 91.010 98.010 96.010 94.010 92.010 9Control20C95RH30C95RH50C95RHTan delta1.00.80.60.40.20.00.00.00 20 40 60 80 100 120 140 160 180 200Temperature (ºC)–20 0 20 40 60 80 100 120 140 160Temperature (ºC)0(a)(b)9999Storage modulus (Pa)1.210 101.010 108.010 9Control20C95RH30C95RH50C95RHControl20C95RH30C95RH50C95RH96.010 90.46.010 994.010 90.24.010 902.010 90.02.010 9–20 0 20 40 60 80 100 120 140 1600 20 40 60 80 100 120 140 1600.00.0Temperature (ºC)Temperature (ºC)–20 0 20 40 60 80 100 120 140160180 200(c)–20 0 20 40 60 80 100120 140 160 180200Temperature (ºC)Temperature (ºC)Control1.220C95RH30C95RH1.0 50C95RH T g 0.8 temperature increases. In contrast, the Tgs for Albipox andTimberset increases as the temperature 0.6 increases due tofurther cross-linking.0.4Tan deltaTan delta1.00.80.61.210 91.010 98.010 9Control20C95RH30C95RH50C95RH dynamic modulus E’ with a shift to lower temperaturesT g is measured based onEffect of Humidity on the Thermal 0.2 Properties of the onset E’ value, then it is seen to decrease as the humidityAdhesivesincreases. The Tgs are in the order of Tg control > Tg >0.0Tg To determine the effect of humidity on the thermal 20 0 20 40 60properties 80 100120 of 140 the adhesives, 160 180200the adhesives –20were 0 20 conditioned 40 60 80 100 and 120 the 140 peaks 160also 180decrease 200 as the humidity increases. ThisTemperature (ºC) Temperature behaviour (ºC) is often referred to as the plasticizing effect of moisture on the polymer (Lee & Peppas 1993). From Figure 11a for Albipox, it can be seen that theLoss modulus (Pa)Control20C95RH30C95RH50C95RHFigure 7. Graph of CB10TSS: (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.Control20C95RH30C95RH50C95RHTan delta1.21.00.80.60.40.20.0–20045