DSC exo +ve In the absence of any EX EX discrete physical or chemical transformations, 0 the baseline signal,as at B s B above,is related to the B heat capacity of the EN sample. temperature→
DSC In the absence of any discrete physical or chemical transformations, the baseline signal, as at B above, is related to the heat capacity of the sample
DSC empty pan D(sample) Tr sample D(sapphire) sapphire T time D(sample) Cp (sample)x mass of sample = D(sapphire) Cp (sapphire)x mass of sapphire
DSC
Liquid s Wat爸vapor Solid P M D Tbw Crystal A Collapse Solution Stickiness Rubber H Ice+Solution B Softening zoeN Tu Reaction zone Entangle且cw I Ice+Solution+Solute Ice+Rubber+Solute g G Ice-GTass FSolute Glass Q Ice+Glass+Solute R 0 Solute Mass Fraction
20 ARRHENIUS 15 GLASS S10 骂 RUBBER WLF 5 0 FLUID ARRHENIUS Tm Tg -5 0.5 1.0 1.5 2.0 Tm/T
DSC DSC应用示例 a b <-MOId IBaH IeuLatoxg e g 1 Wig -100 -50 0 50100 Temperature (C) Fig.4.Thermograms of freeze-dried tomato at high moisture con- tents,Xw:(a)0.5253;(b)0.5967;(c)0.6463;(d0.7427;(e)0.7913;(fD 0.8969;(g)fresh tomato osmotically treated,Xw=0.9097
DSC应用示例