Phase behavior of triblock copolymers varying in molecular asymmetry

被引：50
|
作者：
Hamersky, MW [1 ]
Smith, SD
Gozen, AO
Spontak, RJ
机构：
[1] Procter & Gamble Co, Miami Valley Innovat Ctr, Cincinnati, OH 45061 USA
[2] N Carolina State Univ, Dept Chem & Biomol Engn, Raleigh, NC 27695 USA
[3] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 16期
关键词：
D O I：
10.1103/PhysRevLett.95.168306
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The transformation from A(1)B diblock copolymer to A(1)BA(2) triblock copolymers varying in molecular asymmetry is investigated as the A(2) end block is progressively grown via chemical synthesis. Dynamic rheological measurements show that the order-disorder transition (ODT) temperatures of two copolymer series differing in composition and molecular weight decrease when the A(2) block is short relative to the A(1) block, and then increase as the length of the A(2) block is increased further. The resultant ODT minimum, predicted by mean-field theory, is attributed to mixing between long B and short A(2) blocks.
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页数：4
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