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Home  >  Journal list  >  Polymer Journal  >  Vol.27  No.6 (1995)  >  pp.607-613

Polymer Journal
<<Previous article Vol.27  No.6 (1995)   pp.607 - 613 Next article>>

Morphology and Deformation Mechanisms of Polystyrene/Low Density Polyethylene Blends Studied by TEM

Shiai Xu1), Ming Jiang1) and Jingshu Shen2)
1) Department of Macromolecular Science and Laboratory of Molecular Engineering of Polymers, Fudan University
2) Polymer Physics Laboratory, Institute of Chemistry, Academia Sinica


ABSTRACT:  The present investigation deals with morphology and deformation mechanisms of the plastic-toughened plastic system composed of a crystalline (low density polyethylene, LDPE) and an amorphous (polystyrene, PS) component. By proper use of a solution-melt procedure of specimen preparation for transmission electron microscope (TEM), not only the multiphase structure of the PS/LDPE blends, but also details of the crystalline morphology of LDPE in the blends have been successfully revealed. Based on the TEM morphological observations of the blends under in-situ stretching process, the toughness and deformation mechanisms of the blends are explored. It is found that multiple-craze is the main mechanism of deformation and toughening when LDPE constitutes the dispersed phase, whereas shear-yielding becomes major deformation mode when LDPE forms the continuous phase.


Keyword:
Polyethylene/ Polystyrene/ Polymer Blends/ Electron Microscopy/ Deformation Mechanism/ Craze/ Shear Yield

Published online: April 02, 2005
© Copyright, 2005 by The Society of Polymer Science, Japan

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