In Situ Compatibilization of the Blends of Low-density Polyethylene (LDPE) and Polydimethylsiloxane (PDMS) Rubber by Ethylene Methyl Acrylate (EMA) Copolymer

2007 ◽  
Vol 20 (1) ◽  
pp. 75-92 ◽  
Author(s):  
R. N. Jana ◽  
G. B. Nando
Keyword(s):  
Methyl Acrylate ◽  
Low Density Polyethylene ◽  
Low Density ◽  
In Situ Compatibilization ◽  
Ethylene Methyl Acrylate

In Situ Positron Lifetime Measurement for the Strained Polyethylene

2012 ◽  
Vol 733 ◽  
pp. 139-142
Author(s):  
Masanori Fujinami ◽  
Ryutaro Minei ◽  
Chang Gui Liu ◽  
Kenta Hara
Keyword(s):  
Structural Change ◽  
Positron Lifetime ◽  
Tensile Deformation ◽  
Positron Annihilation Spectroscopy ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Day By Day ◽  
Positron Lifetime Measurement

The in situ positron annihilation spectroscopy measurement has been developed and applied to investigate the structural change in free volume on the tensile deformation of linear low-density polyethylene. The pick-off lifetime of ortho-positronium (Ps) decreases by applying the strain and an aging variation cannot be observed. On the contrary the fraction of Ps formation gradually decreases day by day and becomes constant after several days. Further, after release of strain, it returns to the original value. The reason is considered to be that the molecular chains become rigid gradually during deformation and they lose the flexibility.

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