Aging on isotactic polypropylene by 1H low-field solid-state NMR

PMSE 280

Charles E. Hedesiu, cristihed@gmail.com1, Dan E. Demco1, R. Steenbakkers2, Ralf Kleppinger, ralf.kleppinger@dsm.com3, G. Vanden Poel3, B. Blümich1, Victor M. Litvinov, victor.litvinov@dsm.com3, and K. Remerie2. (1) Rheinisch-Westfälische Technische Hochschule, Institut für Technische und Makromolekulare Chemie, Worringer Weg 1, D-52056 Aachen, Germany, (2) Sabic Europe BV, P.O. Box 319, Geleen, 6160 AH, Netherlands, (3) DSM Research, Geleen, 6160 MD, Netherlands
The changes in the phase composition and chain mobility in injections moulded, slowly crystallized form the melt and quench homopolymer iPP samples, associated with aging at 28°C for 1000 hours, are study with high sensitivity using low field 1H solid-state NMR. The morphology of injections moulded, crystallized from the melt and quenched homopolymer iPP sample was described in terms of two phase model comprising a rigid and soft phases. The effects of change in the morphology of the homopolymer iPP due to the aging are rationalized in terms of increased restriction of the chain mobility in the semi-rigid and soft fractions. All sample exhibit physical aging, and the physical aging kinetics was observed to depend on the morphology of the homopolymer iPP.

Joint PMSE/POLY Poster Session
6:00 PM-8:00 PM, Tuesday, April 8, 2008 Morial Convention Center -- Hall A, Poster

8:00 PM-10:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Sci-Mix

Division of Polymeric Materials: Science & Engineering

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008