Partitioning of main and side-chain units between different phases: a solid-state 13C NMR inversion-recovery cross-polarization study on a homogeneous, metallocene-based, ethylene-1-octene copolymer.
13C NMR inversion-recovery cross-polarization experiments are used to study the phase structure and partitioning of main and side-chain groups in a homogeneous, metallocene-based, ethylene-1-octene copolymer. The results provide strong evidence for a three-phase model, i.e. a rigid, (imperfect) crystalline phase, which is mainly composed of long sequences of methylene carbon atoms of the main chain, a semi-rigid, amorphous interphase (also denoted as 'rigid amorphous'), which is enriched by chain segments bearing methylene and methine carbon atoms of the main chain, and a soft fraction of the amorphous phase (also denoted as 'mobile amorphous'), which is largely composed of side chains and short methylene sequences of the main chain.
Litvinov
Victor M
VM
DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands. victor.litvinov@dsm.com
Mathot
Vincent B F
VB
D002151:Calorimetry; D002152:Calorimetry, Differential Scanning; D002250:Carbon Radioisotopes; D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008854:Microscopy, Electron; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D011095:Polyethylenes / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013696:Temperature
D002250:Carbon Radioisotopes; D009942:Organometallic Compounds; D011095:Polyethylenes; C470748:engage 8200