TY - JOUR
T1 - ENTHALPY RELAXATION OF RIGID POLY(VINYL CHLORIDE).
AU - Straff, R.
AU - Uhlmann, D. R.
PY - 1976
Y1 - 1976
N2 - In the reported experimental study, the changes which take place on annealing rigid PVC in the vicinity of the glass transition have been followed by differential scanning calorimetry. The changes appear as an increase in the glass-transition temperature and a decrease in the enthalpy with time of annealing. For annealing at 75 degree C, the enthalpy after 50-100 hr approaches the value characteristic of the equilibrium liquid state. The results obtained for annealing at 65 degree C and 75 degree C are in accord with those expected for the relaxation of an amorphous material, and are at variance with those expected on the basis of crystallization taking place on annealing. The enthalpy relaxation process is characterized by a distribution of activation energies centered about 18. 8 kcal mole** minus **1, and seems to reflect a multiplicity of molecular processes. 10 refs.
AB - In the reported experimental study, the changes which take place on annealing rigid PVC in the vicinity of the glass transition have been followed by differential scanning calorimetry. The changes appear as an increase in the glass-transition temperature and a decrease in the enthalpy with time of annealing. For annealing at 75 degree C, the enthalpy after 50-100 hr approaches the value characteristic of the equilibrium liquid state. The results obtained for annealing at 65 degree C and 75 degree C are in accord with those expected for the relaxation of an amorphous material, and are at variance with those expected on the basis of crystallization taking place on annealing. The enthalpy relaxation process is characterized by a distribution of activation energies centered about 18. 8 kcal mole** minus **1, and seems to reflect a multiplicity of molecular processes. 10 refs.
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U2 - 10.1002/pol.1976.180140611
DO - 10.1002/pol.1976.180140611
M3 - Article
AN - SCOPUS:0016961543
SN - 0449-2978
VL - 14
SP - 1087
EP - 1095
JO - J Polym Sci Part A-2 Polym Phys
JF - J Polym Sci Part A-2 Polym Phys
IS - 6
ER -