An effective method to identify the type and content of a-olefin in polyolefine copolymer by Fourier Transform infrared-differential Scanning calorimetry

Abstract

A new method for identification of ethylene/ a̧-olefin copolymer was established by Fourier Transform Infared (FTIR)-Differential Scanning Calorimetery (DSC) in this article. DSC and FTIR spectroscopy techniques were used to analysis the type and content of a̧-olefin in polyolefine copolymer. FTIR was available to identify the structures of polyethylene and copolymers of ethylene with different aolefins. The type of polyethylene can be determined by the peak position of 1378 and 1369 cm-1. According to the peak location of 770, 784, and 895 cm-1, the type of a̧-olefin can also be determined. DSC method was used to decide the position of melting peaks. The quantitative investigation of the content of a̧-olefin in polyethylene was calculated by the formula: -ln(CH 2 mol fraction) - - 0.331+135.5/Tm. © 2009 Wiley Periodicals, Inc.