ENTHALPY RELAXATION OF RIGID POLY(VINYL CHLORIDE).

R. Straff, Donald R Uhlmann

Research output: Chapter in Book/Report/Conference proceedingChapter

38 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Title of host publicationJ Polym Sci Part A-2 Polym Phys
Pages1087-1095
Number of pages9
Volume14
Edition6
StatePublished - Jun 1976
Externally publishedYes

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Enthalpy
Annealing
Relaxation processes
Polyvinyl chlorides
Glass transition
Differential scanning calorimetry
Activation energy
Crystallization
Liquids

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Straff, R., & Uhlmann, D. R. (1976). ENTHALPY RELAXATION OF RIGID POLY(VINYL CHLORIDE). In J Polym Sci Part A-2 Polym Phys (6 ed., Vol. 14, pp. 1087-1095)

ENTHALPY RELAXATION OF RIGID POLY(VINYL CHLORIDE). / Straff, R.; Uhlmann, Donald R.

J Polym Sci Part A-2 Polym Phys. Vol. 14 6. ed. 1976. p. 1087-1095.

Research output: Chapter in Book/Report/Conference proceedingChapter

Straff, R & Uhlmann, DR 1976, ENTHALPY RELAXATION OF RIGID POLY(VINYL CHLORIDE). in J Polym Sci Part A-2 Polym Phys. 6 edn, vol. 14, pp. 1087-1095.
Straff R, Uhlmann DR. ENTHALPY RELAXATION OF RIGID POLY(VINYL CHLORIDE). In J Polym Sci Part A-2 Polym Phys. 6 ed. Vol. 14. 1976. p. 1087-1095
Straff, R. ; Uhlmann, Donald R. / ENTHALPY RELAXATION OF RIGID POLY(VINYL CHLORIDE). J Polym Sci Part A-2 Polym Phys. Vol. 14 6. ed. 1976. pp. 1087-1095
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