Title of article :
Specific Heats of Neat and Glycerol Plasticized Polyvinyl Alcohol
Author/Authors :
Tin Sin, Lee Universiti Teknologi Malaysia - Faculty of Chemical and Natural Resources Engineering - Department of Polymer Engineering, Malaysia , Abdul Rahman, Wan Aizan Wan Universiti Teknologi Malaysia - Faculty of Chemical and Natural Resources Engineering - Department of Polymer Engineering, Malaysia , Rahmat, Abdul Razak Universiti Teknologi Malaysia - Faculty of Chemical and Natural Resources Engineering - Department of Polymer Engineering, Malaysia , Morad, Noor Azian Universiti Teknologi Malaysia, International Campus - College of Science and Technology - Department of Mechanical Engineering, Malaysia , Nizam Salleh, Mohd Shahrul Universiti Teknologi Malaysia - Faculty of Chemical and Natural Resources Engineering - Department of Polymer Engineering, Malaysia
Abstract :
The specific heats (Csp) of neat polyvinyl alcohol (NPVOH) and 40 phr glycerol plasticized polyvinyl alcohol (PPVOH) were measured using a method known as power compensate differential scanning calorimetry. A high purity sapphire (Al2O3) was used as a reference material. NPVOH has a melting temperature of approximately 480 K, while PPVOH has a value of 30 K lower than NPVOH. The amplitude increment of Csp for NPVOH was also higher than PPVOH at melting stage. Overall, Csp of NPVOH is lower than PPVOH because glycerol has reduced the rigidity of PVOH and subsequently induced the motion of molecular structure at an elevated temperature. Based on the specific heat outcomes, neat PVOH and glycerol plasticized PVOH required 1173.544 J/g and 1946.631 J/g, respectively, to heat from 330 to 550 K.
Keywords :
Polyvinyl alcohol , glycerol , specific heat , differential scanning calorimetry
Journal title :
Pertanika Journal of Science and Technology ( JST)
Journal title :
Pertanika Journal of Science and Technology ( JST)
