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Propylene-Ethylene Copolymers: Ethylene Content Influence on Molecular and Thermomechanical Properties by T. Ojeda; S. Liberman; R. Amorim; D. Samios is a Materials Science article available to read on EtoBox.

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Propylene-ethylene copolymers with ethylene content of 1.6 -5.4 % w/w were obtained by bulk polymerization in laboratory reactors through high activity MgC^/TiCU based catalysts. The influence of ethylene content on the molecular and thermomechanical properties was studied. The techniques applied for the characterization were: Fourier-Transform Infrared Spectroscopy (FTIR), Viscosimetry, Rotational Rheometry, Differential Scanning Calorimetry (DSC), Dynamic-Mechanical Analysis (DMA) and Pendulum Impact Test. It was observed that up to a certain ethylene content (~3 % w/w in the system studied), the copolymer is characterized by isolated ethylene comonomeric units in the macromolecular chain. The addition of ethene causes a perturbation in the propylene crystalline structure, which is reflected in a decrease of melting and crystallization temperatures. Solubility tests allow the ethylene-propylene rubber (EPR) to be separated from the crystallizable fraction. Samples with higher ethylene content are a) To whom correspondence should be addressed. Vol. 16, Nos. 1-2, 1996/7 Propylene-Ethylene Copolymers: Ethylene Content Influence on Molecular and Thermomechanical Properties characteri

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Author

T. Ojeda; S. Liberman; R. Amorim; D. Samios

Published

1996

Field

Materials Science (Physical Sciences)