12.07.2015 Views

Contents - Akademi Sains Malaysia

Contents - Akademi Sains Malaysia

Contents - Akademi Sains Malaysia

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

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

0 20 40 60 80 100 120 140 160Temperature (ºC)–50 0 50 100 150Temperature (ºC)0 201.8Control 1.6Control20C75RH20C95RH1.420C75RH1.810 102.510 9 20C95RH1.2Control1.610 10Control20C75RH1.01.410 1020C75RH 2.010 920C95RH0.8 20C95RH1.210 100.61.510 91.010 108.010 90.41.010 96.010 90.24.010 90.05.010 82.010 9–0.20 50 100 1500 20 40 60 80 100 1200.00.0140 160 180Temperature (ºC)Temperature (ºC)0 20 40 60 80 100 120 140 160 180 200–20 0 20 40 60 80 100 120140 160180 200Temperature (ºC)Temperature (ºC)Storage modulus (Pa)Tan deltaLoss modulus (Pa)Tan delta1.21.00.80.60.40.20.0–20 0 20(a)(b)Control20C75RH20C95RH1.21.0Control20C75RH20C95RHTan delta0.80.60.40.20.020 40 60 80 100 120140 160180 200Temperature (ºC)–20 0 20 40 60 80 100 120 140160 180 200Temperature (ºC)(c)Figure 12. Graph of Timberset: (a) Storage modulus versus temperature;(b) Loss modulus versus temperature and (c) Tan d versus temperature for control samples andsamples exposed to 20°C/75%RH and 20°C/95%RH.aims of this study, to raise the glass transition temperatureThis research has deduced that the high glass transitiontemperature of Timberset was related to its high crosslink In general, the presence of high temperature andmoisture induced plasticization which reduced the T gand the strength of the adhesives. After exposed to allconditions, the storage modulus, E’ and the T g for Albipoxat those conditions and this showed that the addition ofT g . ForAlbipox, this was probably due to the nano-particulaterubber content where the rubber particles reacted withthe epoxy forming an interphase of amorphous nature. Itis known that CTBN possesses reactive-end groups whichwill phase-separate during cure and induce a high reactivitywith the epoxide ring of the epoxy molecule (Wise et al. during plasticization and further crosslinking that has takenplace.The E’ curves yielded information on the modulus ofall adhesives and the values decreased as temperature and result supported other studies that room-temperature curing50

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

Saved successfully!

Ooh no, something went wrong!