Raman Scattering in Crystalline Polyethylene

摘要

The Raman scattering in crystalline polyethylene, deuterated polyethylene, andnhyphen;paraffins has been investigated as a function of temperature. Crystalhyphen;field splitting of theA1Gmethylene bending mode observed at room temperature increases at minus;thinsp;160deg;C in both polyethylene and deuterated polyethylene. No splitting of theB2Gskeletal stretching mode and theB3Gmethylene twisting modes in polyethylene is observed at room temperature, but the two components of the space group fundamental are resolved at minus;thinsp;160deg;C. Similarly, splitting of theB2Gmethylene wagging mode in deuterated polyethylene is observed at minus;thinsp;160deg;C but not at room temperature. The observed crystalhyphen;field splittings are discussed in terms of splittings calculated from repulsive forces between hydrogen atoms on neighboring chains in the polyethylene crystal.