Solid phase modification of poly(propylene). The role of the polymer texture in the peroxide distribution

Zsuzsa László-Hedvig, Enikö Dobai, L. Korecz, Péter Nagy, Achim Hesse, Manfred Rätzsch, Ferenc Tüdös

Research output: Contribution to journalArticle

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Abstract

Different poly(propylene)s were reacted with tert-butyl peroxybenzoate (TBPB) in solid phase and the time dependence of the concentration of tertiary polymer radicals ([A*]) formed was measured by ESR spectroscopy at 145°C. The distribution (or solubility) of peroxide was found uneven (or limited), the segregation of solid dilauroyl peroxide (DLPO) was proved by DSC. It was found that not the crystalline/amorphous ratio was the decisive factor in poly(propylene)/peroxide solid phase reactions, but much more the crystallite size of the polymer texture. The latter was determined by X-ray measurements. Poly- (propylene)s with average crystallite diameters of about 250 Å showed a characteristic dependence on peroxide concentration in the solid phase reaction of tertiary carbon radical forming. The log [A*] vs. time curves show a good linearity, the relationships correspond to a unimolecular overall kinetics. When the crystallite diameters were 17-40% less than 250 Å, the polymer radical concentration ([A*]) did not show a characteristic dependence on TBPB concentration. Our findings are interpretable in terms of capillary condensation of peroxides.

Original languageEnglish
Pages (from-to)2696-2701
Number of pages6
JournalMacromolecular Chemistry and Physics
Volume202
Issue number13
DOIs
Publication statusPublished - Sep 18 2001

Fingerprint

Peroxides
peroxides
polypropylene
solid phases
Polypropylenes
Polymers
textures
Textures
polymers
Crystallite size
time dependence
linearity
Paramagnetic resonance
Condensation
Carbon
solubility
Solubility
condensation
Spectroscopy
Crystalline materials

ASJC Scopus subject areas

  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Solid phase modification of poly(propylene). The role of the polymer texture in the peroxide distribution. / László-Hedvig, Zsuzsa; Dobai, Enikö; Korecz, L.; Nagy, Péter; Hesse, Achim; Rätzsch, Manfred; Tüdös, Ferenc.

In: Macromolecular Chemistry and Physics, Vol. 202, No. 13, 18.09.2001, p. 2696-2701.

Research output: Contribution to journalArticle

László-Hedvig, Zsuzsa ; Dobai, Enikö ; Korecz, L. ; Nagy, Péter ; Hesse, Achim ; Rätzsch, Manfred ; Tüdös, Ferenc. / Solid phase modification of poly(propylene). The role of the polymer texture in the peroxide distribution. In: Macromolecular Chemistry and Physics. 2001 ; Vol. 202, No. 13. pp. 2696-2701.
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