Pathway-Dependent Melting in a Low-Molecular-Weight Polyethylene-block-Poly(ethylene oxide) Diblock Copolymer

2004 ◽  
Vol 25 (8) ◽  
pp. 853-857 ◽  
Author(s):  
Lu Sun ◽  
Yuxiu Liu ◽  
Lei Zhu ◽  
Benjamin S. Hsiao ◽  
Carlos A. Avila-Orta
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Diblock Copolymer ◽  
Low Molecular Weight ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

scholarly journals Structural Evolution of Low-Molecular-Weight Poly(ethylene oxide)-block-polystyrene Diblock Copolymer Thin Film

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hui Wu ◽  
Xiaohua Huang
Keyword(s):  
Thin Film ◽  
Molecular Weight ◽  
Ethylene Oxide ◽  
Diblock Copolymer ◽  
Polymer Brush ◽  
Structural Evolution ◽  
Interlamellar Spacing ◽  
Low Molecular Weight ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The structural evolution of low-molecular-weight poly(ethylene oxide)-block-polystyrene (PEO-b-PS) diblock copolymer thin film with various initial film thicknesses on silicon substrate under thermal annealing was investigated by atomic force microscopy, optical microscopy, and contact angle measurement. At film thickness below half of the interlamellar spacing of the diblock copolymer (6.2 nm), the entire silicon is covered by a polymer brush with PEO blocks anchored on the Si substrate due to the substrate-induced effect. When the film is thicker than 6.2 nm, a dense polymer brush which is equal to half of an interlamellar layer was formed on the silicon, while the excess material dewet this layer to form droplets. The droplet surface was rich with PS block and the PEO block crystallized inside the bigger droplet to form spherulite.

Isothermal thickening and thinning processes in low molecular weight poly(ethylene oxide) fractions crystallized from the melt

Polymer ◽  
1999 ◽  
Vol 40 (16) ◽  
pp. 4543-4551 ◽  
Author(s):  
E.-Q. Chen ◽  
S.-W. Lee ◽  
A. Zhang ◽  
B.-S. Moon ◽  
P.S. Honigfort ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Low Molecular Weight ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene
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