Crystallization of Polystyrene-block-[Syndiotactic Poly(propylene)] Block Copolymers from Confinement to Breakout

✍ Scribed by Rong-Ming Ho; Tsai-Ming Chung; Jing-Cherng Tsai; Jing-Chang Kuo; Benjamin S. Hsiao; Igors Sics

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 281 KB
• Volume: 26
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200400467

✦ Synopsis

Abstract

Summary: Various crystalline textures have been identified in a crystallizable block copolymer system, polystyrene‐block‐[syndiotactic poly(propylene)] (PS‐sPP), having a glass‐transition temperature of PS (T~g,PS~) located in the midst of the sPP crystallization window. A confined morphology for the crystallization of sPP was observed while the crystallization temperature of sPP (T~c,sPP~) was less than T~g,PS~. A further increase in T~c,sPP~ could lead to a breakout in nanostructure. This study revealed the T~g~ effect on crystallization‐induced morphological changes of block copolymers from confinement to breakout.

TEM images and one‐dimensional SAXS profiles of PS‐sPP isothermally crystallized at T~ODT~ > T~g,PS~ > T~c,sPP~ (top) and T~ODT~ > T~c,sPP~ > T~g,PS~ (bottom).

imageTEM images and one‐dimensional SAXS profiles of PS‐sPP isothermally crystallized at T~ODT~ > T~g,PS~ > T~c,sPP~ (top) and T~ODT~ > T~c,sPP~ > T~g,PS~ (bottom).