Rigidity of heat-treated oriented isotactic polypropylene

TSOBKALLO K., TIKHOMIROV A., BOZDOĞAN A., TSHMEL A.

JOURNAL OF APPLIED POLYMER SCIENCE, cilt.102, sa.6, ss.6074-6080, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 102 Sayı: 6
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1002/app.25010
  • Dergi Adı: JOURNAL OF APPLIED POLYMER SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.6074-6080
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

Uniaxially oriented commercial films of isotactic polypropylene were strained with ends keeping fixed and subjected to the heat treatment at temperatures from 50 to 200 degrees C. The rigidity of annealed samples was characterized by the value of tangent modulus, Et, determined graphically at the initial portions of stress-strain curves. The structural changes in the samples were studied with the help of the IR and low-frequency Raman spectroscopies. The smallest Et values were obtained for the low-strained films, while the tangent moduli measured for highly strained samples exceeded the value for the original (untreated) filin. The most prominent positive effect was achieved after annealing the samples at 90 degrees C. (c) 2006 Wiley Periodicals, Inc.