Citation: YAN Rongjiang, JIANG Bingzheng. A RAMAN-SPECTROSCOPIC STUDY OF PHASE STRUCTURE OF DRAWN POLYETHYLENE*[J]. Chinese Journal of Polymer Science, ;1993, 11(1): 76-83. shu

A RAMAN-SPECTROSCOPIC STUDY OF PHASE STRUCTURE OF DRAWN POLYETHYLENE*

Received Date: 4 May 1991

A drawn high density polyethylene(HDPE)has been measured by Raman spectroscopy and differential scanning calorimetry (DSC). The crystalline structure of drawn HDPE is analysed by the Raman internal modes in terms of mass fractions of the crystalline orthorhombic phase, the liquid- like amorphous phase and the disordered anisotropic phase. The mass fractions depend on draw temperature Td and draw ratio Rd. The fraction of disordered anisotropic amorphous phase changes very little with, the Tdand increases with increasing Rd.Sum of the mass fractions of crystalline orthorhombic phase and the disordered anisotropic phase increases linearly as the same slope as the crystallinity Wc determined from DSC measurements with increasing Td or Rd and it is higher than the Wc for all the samples.The results show that the mass fraction of disordered anisotropic phase is partially devoted by the taut tie molecules(TTMs) in the amorphous state.The dependence of the disordered anisotropic phase on Td and Rd supports the mechanism of plastic deformation of fibre structure.
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