Effect of annealing cold-drawn polystyrene and polymethylmethacrylate below Tg
- 1 March 1973
- journal article
- research article
- Published by Taylor & Francis in Journal of Macromolecular Science, Part B
- Vol. 7 (2), 243-252
- https://doi.org/10.1080/00222347308212584
Abstract
Annealing of both cold-drawn atactic polystyrene and cold-drawn poly-methylmethacrylate at temperatures ranging from 50°C to their respective Tg's and for times ranging from 1 to 6 days gradually but completely eliminates the orientation arcing from the wide-angle X-ray diffraction pattern but induces only ∼25% recovery of the cold-drawn deformation (as calculated from dimensional shrinkage). Analogous studies show that the birefringence of cold-drawn polystyrene is reduced by 57% during the annealing treatment. The results are evidence for segmental molecular motion below Tg and suggest that the molecular alignment responsible for the wide-angle X-ray diffraction arcing is not necessarily the same molecular orientation required for dimensional recovery. We have tentatively interpreted these results in terms of our recently proposed structural model consisting of both ordered domains and connecting disordered regions in the amorphous polymeric solid state. Annealing below Tg can produce chain backbone motion within the disordered regions and cause disorientation of the aligned ordered domains brought about by the initial cold-draw process.Keywords
This publication has 12 references indexed in Scilit:
- Effect of annealing cold drawn polycarbonate below TgJournal of Polymer Science Part B: Polymer Letters, 1972
- Yielding Behavior of Glassy Amorphous PolymersJournal of Applied Physics, 1971
- Infrared spectroscopic evidence for polycarbonate chain backbone motion below TgJournal of Polymer Science Part B: Polymer Letters, 1971
- Crystallization of polycarbonate from the glassy state. part I. Thin films cast from solutionJournal of Macromolecular Science, Part B, 1970
- Crazing, yielding, and fracture of polymers. I. Ductile brittle transition in polycarbonateJournal of Applied Polymer Science, 1969
- Crystallization of polyethylene terephthalate from the glassy amorphous stateJournal of Macromolecular Science, Part B, 1967
- Strain-induced crystallization of polyethylene terephthalateJournal of Macromolecular Science, Part B, 1967
- Electron microscopic investigations on amorphous polycarbonateJournal of Polymer Science Part B: Polymer Letters, 1967
- The effect of thermal pretreatment on the strength of polycarbonateJournal of Applied Polymer Science, 1967
- The Relation of Transition Temperatures to Chemical Structure in High PolymersRubber Chemistry and Technology, 1963