Determination of thermal behavior of leathers in different processes by differential scanning calorimetry and evaluation of the analysis conditions Farkli proses aşamasindaki˙ deri˙leri˙n di˙feransi˙yel taramali kalori˙metre i˙le termal davranişlarinin belirlenmesi ve anali˙z koşullarinin değerlendirilmesi˙