Fourier Transform Raman Spectra of Linear Low-Density Polyethylene and Prediction of Their Density by Multivariate Data Analysis

1999 ◽  
Vol 53 (5) ◽  
pp. 551-556 ◽  
Author(s):  
K. Sano ◽  
M. Shimoyama ◽  
M. Ohgane ◽  
H. Higashiyama ◽  
M. Watari ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Data Analysis ◽  
Raman Spectra ◽  
Multivariate Data Analysis ◽  
Multivariate Data ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Fourier Transform Raman

scholarly journals Three-Phase Characterization of Uniaxially Stretched Linear Low-Density Polyethylene

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Blerina Kolgjini ◽  
Gustaaf Schoukens ◽  
Paul Kiekens
Keyword(s):  
Raman Spectra ◽  
Draw Ratio ◽  
Phase Morphology ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Structure Variation ◽  
X Ray ◽  
Three Phase ◽  
Cold Draw

This study comprises a detailed morphological study of cold-drawn polyethylene monofilaments by Raman spectroscopy, differential scanning calorimetry (DSC) and X-ray measurements. The structure of the three-phase morphology of the linear low-density polyethylene monofilaments was investigated by combining these measurements. It was found that the most important structure variation was found in the intermediate or rigid amorphous phase, whereby the amounts of crystalline and amorphous phases were nearly constant and almost independent of the cold-draw ratio. The intermediate third phase contains gauche and transmolecules, and the amount of transmolecules was increased with the cold-draw ratio and was directly related to this cold-draw ratio. It was found that the two peaks in the Raman spectra, respectively, at 1303 and 1295 cm-1, can be correlated to the amount of gauche and transmolecules in the polyethylene monofilaments. A good and new insight into the three-phase morphology was obtained by combining the DSC and X-ray measurements with the amounts of trans- and gauche molecules from the Raman spectra analysis.

Determination of the Percentage of Homopolymer Component in Ziegler/Natta Catalyst Linear Low-Density Polyethylene Resins Using High-Temperature Cell Fourier Transform Infrared and Partial Least Squares Quantitative Analysis Technique

2005 ◽  
Vol 59 (3) ◽  
pp. 300-304 ◽  
Author(s):  
Marlee Cossar ◽  
Joo Teh ◽  
Annikki Kivisto ◽  
Jason Mackenzie
Keyword(s):  
Fourier Transform ◽  
High Temperature ◽  
Quantitative Analysis ◽  
Ir Spectrum ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Analysis Technique ◽  
Ft Ir

A new method for the determination of the percentage of homopolymer component, using high-temperature cell Fourier transform infrared (FT-IR) by partial least squares (PLS) quantitative analysis technique, was developed and applied to Ziegler Natta linear low-density polyethylene (LLDPE). The method is based on the IR spectrum changes between the 730 cm−1 band and 720 cm−1 band at the temperature of 110 °C, which is near the melting point of the polyethylene. The HD% (the percentage of high-density component, i.e., the percentage of homopolymer component) results obtained by CTREF (CRYSTAF in TREF mode) technique are used as the input data together with the respective FT-IR spectra for PLS analyses to establish a calibration curve. The PLS quality is characterized by a correlation coefficient of 0.997 (cross-validation) using four factors and a root mean square error of calibration (RMSEC) of 0.772. The HD% of the unknown can then be predicted by the PLS software from the unknown FT-IR spectrum. A control resin was tested seven times by CTREF and FT-IR. The HD% of the control resin was 28.59 ± 0.88% by CTREF and 29.05 ± 2.37% by FT-IR. It was found that the method was applicable for the same comonomer type of LLDPE within a melt index range and density.

Sign in / Sign up

Export Citation Format

Share Document