Impression recovery of PMMA

Fuqian Yang, J. C.M. Li

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Impression recovery in which the deformation temperature is the same as recovery temperature is studied for the first time. PMMA is deformed by impression above the glass transition temperature to a depth of less than 0.3 mm and recovered at the same temperature. Almost complete recovery of dimension is observed every time. The dimensional changes obey second order kinetics and the temperature dependence of the rate constant shows two consecutive processes with activation energies 440 kJ/mole (between 104 and 113 °C) and 95 kJ/mole (between 113 and 140 °C). Two pairs of defects of opposite signs are believed to be involved in the dimensional recovery processes.

Original languageEnglish
Pages (from-to)2809-2814
Number of pages6
JournalJournal of Materials Research
Issue number10
StatePublished - Oct 1997

Bibliographical note

Funding Information:
This work was supported by NSF through DMR 9221326 and DMR 9623808 both monitored by Dr. Bruce MacDonald. Aric Shorey helped with some experiments.

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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