CAESURA Studies of Helical Jump Motions in Semi-Crystalline Polymers

• Published in: Macromolecular chemistry and physics Vol. 208; no. 19-20; pp. 2055 - 2065
• Main Authors: Shao, Limin, Titman, Jeremy J.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 24.10.2007; WILEY‐VCH Verlag; Wiley
• Subjects: Applied sciences; Exact sciences and technology; exchange NMR; glass transition; magic-angle spinning; molecular dynamics; Organic polymers; Physicochemistry of polymers; Properties and characterization; semi-crystalline polymers; Structure, morphology and analysis; semi-crystalline polymers; Propylene polymer; exchange NMR; NMR spectrometry; Semicrystalline polymer; Experimental study; molecular dynamics; Alpha form; Two dimension spectrometry; Magic angle; Solid state; magic-angle spinning; Investigation method; Local mobility; Isotactic polymer; glass transition
• ISSN: 1022-1352; 1521-3935
• DOI: 10.1002/macp.200700192

Applications of the CAESURA experiment to studies of helical jump motions in semi‐crystalline polymers are described. CAESURA is a recently proposed magic angle spinning exchange NMR experiment which provides detailed information about the timescale and geometry of molecular motions. The potential utility of CAESURA in studies of helical jump motions in a range semi‐crystalline polymers is illustrated using simulated data. In addition, a full experimental investigation of isotactic poly(propylene) is described which confirms the geometry of the helical jump motion and provides a measurement of the jump rate.