COLD DRAWING IN CRYSTALLINE POLYMERS
Final rept. 15 Jun 1966-15 Sep 1967
STEVENS INST OF TECHNOLOGY HOBOKEN NJ
Pagination or Media Count:
In this investigation of the plastic yield or cold-drawing phenomenon in crystalline polymers, most of the work was carried out on Nylon 6, although polyethylene terephthalate PET, polyacrylonitrile PAN and polyvinyl chloride PVC were also studied. Absorption of plasticizers water, alcohols, phenol in Nylon 6 produced changes in the crystalline structure as well as plasticizer action these two effects must therefore be carefully distinguished. Changes in the crystalline structure were followed by changes in the infrared spectrum. Dynamic mechanical and thermogravimetric analysis TGA measurements were carried out on the polymer before and after treatment. Phenol treatment produces a total disappearance of the yield peak in the stress-strain curve and a simultaneous disappearance of neck formation. The drawing of amorphous PET was studied under dead-load creep conditions. Creep drawing of plasticized PVC was also measured. Measurements were made of the temperature dependence of orientation birefringence in PVC containing different amounts of plasticizers dioctyl phthalate, dioctyl adipate, tricresyl phosphate. The different plasticizers produced very different effects in this type of experiment.
- Polymer Chemistry