Premium
Thermal decomposition behavior of sericin cocoon
Author(s) -
Tsukada Masuhiro
Publication year - 1978
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1978.070220221
Subject(s) - fibroin , sericin , differential thermal analysis , endothermic process , thermal decomposition , materials science , thermal analysis , silk , chemical engineering , chemistry , thermal , diffraction , polymer chemistry , composite material , adsorption , organic chemistry , thermodynamics , physics , optics , engineering
The behavior on thermal degradation of the sericin cocoon consisting of a sericin and a few fibroin has been examined by means of evolved gas analysis (EGA), evolved gas detection (EGD), and differential thermal analysis (DTA). The sericin cocoons produced from the silkworm (Nd, Nd‐s/Nd‐s,Nd‐s/+) and sericin stripped from the silk gland in the silkworm show two endothermic peaks at 220°C and 270°C according to differential thermal analysis. From the x‐ray diffraction pattern, dynamic mechanical measurement, and the thermal gravity analysis (TG), the former peak occurs by the scission of the structural state and the change from crystalline to amorphous. Moreover, at 220°C, the weight changes markedly, the yellowness index ( L/b ) measured by the color difference meter abruptly decreases, and the gas (CO 2 ), evolved from the sericin cocoon, shows increases above 200°C.