CHARACTERIZATION OF POLY(XYLYLENES) WITH SOLID-STATE C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY

Poly(xylylenes) are an important class of thermoplastics that are read ily prepared by thermolysis of [2.2]paracyclophane or xylene precursor s to afford xylylene monomers that condense and polymerize on solid su rfaces to give polymer films. As most poly(xylylenes) are insoluble du e to a high degree of crystallinity, characterization by solid-state n uclear magnetic resonance spectroscopic techniques is necessary. In th is paper we describe the preparation of poly(xylylene) (P1), poly(2-et hylxylylene) (P2), poly(2-chloroxylylene) (P3), poly(2,3-dichloroxylyl ene) (P4), and oly(alpha,alpha,alpha',alpha'-tetrafluoroxylylene) (P5) and their characterization using solid-state C-13 cross polarization magic angle spinning nuclear magnetic resonance (CP MAS NMR) spectrosc opy.