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

1995 ◽  
Vol 27 (6) ◽  
pp. 607-613 ◽  
Author(s):  
Shiai Xu ◽  
Ming Jiang ◽  
Jingshu Shen
Keyword(s):  
Deformation Mechanisms ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Polyethylene Blends

scholarly journals Microstructural Contributions of Different Polyolefins to the Deformation Mechanisms of Their Binary Blends

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1171 ◽  
Author(s):  
Astrid Van Belle ◽  
Ruben Demets ◽  
Nicolas Mys ◽  
Karen Van Kets ◽  
Jo Dewulf ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Tensile Deformation ◽  
Deformation Mechanisms ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Mechanical Recycling ◽  
Immiscible Polymer Blends ◽  
Binary Blends ◽  
Brittle Behavior ◽  
Clear Cut

The mixing of polymers, even structurally similar polyolefins, inevitably leads to blend systems with a phase-separated morphology. Fundamentally understanding the changes in mechanical properties and occurring deformation mechanisms of these immiscible polymer blends, is important with respect to potential mechanical recycling. This work focuses on the behavior of binary blends of linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene (PP) under tensile deformation and their related changes in crystallinity and morphology. All of these polymers plastically deform by shear yielding. When unmixed, the high crystalline polyolefins HDPE and PP both exhibit a progressive necking phenomenon. LDPE initiates a local neck before material failure, while LLDPE is characterized by a uniform deformation as well as clear strain hardening. LLDPE/LDPE and LLDPE/PP combinations both exhibit a clear-cut matrix switchover. Polymer blends LLDPE/LDPE, LDPE/HDPE, and LDPE/PP show transition forms with features of composing materials. Combining PP in an HDPE matrix causes a radical switch to brittle behavior.

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